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The value of cytology in granulomatous mastitis: a report of 16 cases from Malaysia

Yip CH, Jayaram G, Swain M

Aust N Z J Surg, 2000 Feb;70(2):103-5.
PMID: 10711470

BACKGROUND: Granulomatous mastitis is a rare condition of the breast that can mimic a carcinoma. There are characteristic histological features, the most important of which is a predominantly lobular inflammatory process. It must be differentiated from known causes of granulomatous inflammation, such as tuberculosis.
METHODS: In the present paper, the clinical and pathological features of 16 patients with granulomatous mastitis seen over a 3-year period in the University Hospital, Kuala Lumpur, are described.
RESULTS: A clinical suspicion of malignancy was present in 10 cases. One of the patients was nulliparous. One had an associated hyperprolactinaemia, while two had systemic lupus erythromatosis. One of the patients was pregnant at the time of presentation. Four patients had localized lumps excised, five were treated conservatively because the lesion was too extensive to resect, and seven patients required drainage procedures for abscess formation.
CONCLUSION: Awareness of this condition is important because it mimics a carcinoma, and surgery may not be the best treatment for recurrent disease.
Fulltext The experience with fine needle aspiration cytology in the management of palpable breast lumps in the University Hospital Kuala Lumpur

Yip CH, Jayaram G, Alhady SF

Med J Malaysia, 2000 Sep;55(3):363-7.
PMID: 11200718

A total of 676 palpable breast lumps seen in the Breast Clinic, University Hospital, Kuala Lumpur from August 1993 to August 1994 were subjected to fine needle aspiration cytology. Fifty-four were reported as inadequate, 501 benign, 95 malignant and 26 suspicious. One hundred and eighty-seven aspirates had histological correlation, while 34 of the malignant aspirates had clinical correlation. The majority of the other 455 patients were followed up for a period of 60 to 72 months without any malignancies becoming apparent. For analysis, only the 221 cases with histological or clinical correlation were included, (the suspicious category was included into the positive group and the inadequate cases were excluded), giving a sensitivity of 91.7%, a specificity of 91.7% and a diagnostic accuracy of 91.7%. Breast cytology was an accurate and rapid method of diagnosis of breast diseases, and in a busy surgical unit with limited operating time, it allowed for the triage of patients with breast complaints in deciding which cases needed early open biopsy. A negative cytology does not exclude the possibility of cancer, as there was a false negative rate of 11%. However by utilising a diagnostic triad of clinical examination, radiological assessment and fine needle aspiration cytology, the risk of missing a malignancy is small.
Fulltext The Breast Clinic in University Hospital--a four-month survey

Yip CH, Alhady SF, Jayaram G

Med J Malaysia, 1995 Sep;50(3):268-71.
PMID: 8926907

The breast clinic in the university Hospital Kuala Lumpur was started in August 1993 to cater for the increasing number of women seeking treatment for breast complaints. A four-month survey carried out from January to April 1994 found that Chinese women are more "breast conscious" than Malay and Indian women. The majority of patients were in the reproductive age group. Benign breast diseases form the majority of cases of breast diseases seen. The pick-up rate for new cases of breast cancer was 3.1%. Fine needle aspiration biopsy had a 100% sensitivity during the four-month study, and was a quick method of obtaining a diagnosis.

Study site: Breast clinic, University Malaya Medical Centre (UMMC)
The diagnostic usefulness of tumour markers CEA and CA-125 in pleural effusion

Sthaneshwar P, Yap SF, Jayaram G

Malays J Pathol, 2002 Jun;24(1):53-8.
PMID: 16329556

Pleural effusion is a common diagnostic problem. The analysis of serum and pleural fluid for tumour markers is widely used as a diagnostic aid in clinical practice. The aim of the present study was to determine the usefulness of simultaneous quantification of carcinoembryonic antigen (CEA) and carbohydrate antigen (CA-125) in distinction of malignant from benign effusion. Data from a total of 78 patients including 53 patients with benign and 25 patients with malignant effusion was evaluated. The cut-off values for differentiating benign from malignant effusions were determined using results obtained from patients with known benign effusions (mean + 2 SD, 95% confidence interval). The cut-off for CEA and CA-125 were 5.1 ng/ml and 1707 IU/ml respectively. CEA assay in pleural fluid had an acceptable sensitivity and good specificity of 64% and 98% respectively. CA-125 had a sensitivity of 36% and specificity of 94%. The combination of the two tumour markers gave a sensitivity of 72% and specificity of 92.4%. We suggest a good clinical strategy may be to begin with CEA measurement (assay specificity 98%); if CEA is below the cut-off value (negative), CA-125 could then be measured to improve the sensitivity of detection of malignant effusions. However, measurement of these tumour markers is not cost effective from the point of view that it does not give information on the type of malignancy present. The latter has to be determined either by histological or cytological study.
Fulltext Localised nodular pulmonary amyloidosis in a patient with sicca syndrome

Srinivas P, Liam CK, Jayaram G

Med J Malaysia, 2000 Sep;55(3):385-7.
PMID: 11200724

A 52 year old Chinese woman with a 25 year history of sicca syndrome (primary Sjogrens syndrome) was investigated for 3 episodes of haemoptysis. Clinical examination was unremarkable except for the presence of dry eyes and xerostomia. Computed tomography of the chest revealed a lobulated mass in the posterior basal segment of the left lower lobe. Histopathological examination of this resected nodule confirmed the diagnosis of nodular amyloidosis. The normal radiolabelled serum amyloid P component scintigraphy and the absence of monoclonal plasma cell dyscrasia in the bone marrow strongly support the diagnosis of localised nodular pulmonary AL amyloidosis in this patient. Nodular pulmonary amyloidosis can be associated with sicca syndrome and often simulates bronchogenic carcinoma, bronchiectasis or pulmonary tuberculosis.
Congenital esophageal stenosis: report of three cases, literature review, and a proposed classification

Ramesh JC, Ramanujam TM, Jayaram G

Pediatr Surg Int, 2001 Mar;17(2-3):188-92.
PMID: 11315285

The aim of this paper is to report three cases of congenital esophageal stenosis (CES) of different anatomical varieties: (1) stenosis due to tracheobronchial remnants (TBR) involving the lower third of the esophagus; (2) fibromuscular stenosis (FMS) of the middle third; and (3) a membranous diaphragm (MD) involving the lower third. The first two patients were treated by segmental resection of the esophagus and end-to-end anastomosis with dramatic relief of symptoms. The third responded to dilatation. CES is a rare lesion, and about 500 cases are reported in the literature. CES due to TBR and fibromuscular hypertrophy is considered a segmental stenosis, as it involves a length of the esophageal wall, whereas the MD consists of mucosal folds and does not involve its muscular layer. The clinical presentation is varied, and a high index of suspicion is essential to arrive at an early diagnosis. Management depends on the type and severity of the stenosis. Stenosis due to TBR requires segmental resection. FMS may respond to dilatation, but severe degrees of stenosis require segmental excision. MDs usually respond to dilatation or may require endoscopic excision. Segmental stenosis can occur as an isolated lesion or in association with esophageal atresia or stenosis due to a MD. Based on this observation, a classification of CES is proposed.
Duplication of the rectum: report of four cases and review of the literature

Rajah S, Ramanujam TM, Anas SR, Jayaram G, Baskaran P, Ganesan J, et al.

Pediatr Surg Int, 1998 Jul;13(5-6):373-6.
PMID: 9639621

Rectal duplications are rare anomalies. Recently, we observed four cases of rectal duplication, each presenting with different clinical features including chronic constipation, a prolapsing rectal "polyp, " a "growth" from the vulva, and acute retention of urine. The variety of clinical presentations may lead to delay in diagnosis and multiple operations.
Fulltext Prostate-specific antigen in breast disease

Poh BH, Jayaram G, Sthaneshwar P, Yip CH

Malays J Pathol, 2008 Jun;30(1):43-51.
PMID: 19108411 MyJurnal

The aim of this study is to assess tissue and serum prostate-specific antigen (PSA) in breast lesions; to compare tissue PSA with serum PSA; to compare tissue PSA in benign and malignant lesions and to compare PSA with known prognostic factors in breast carcinoma. Tissue PSA immunoreactivity in twenty women with breast carcinoma was compared with PSA in twenty-three women with benign breast lesions. Tissue PSA was also compared with known prognostic indicators such as tumour size, axillary nodal status, histological type, histological grade, oestrogen receptor status, progesterone receptor status and c-erbB-2 oncoprotein over-expression. Serum free PSAlevels from these women were measured pre- and post-operatively and an attempt was made to correlate serum PSA with tissue PSA expression. 40% and 43% of malignant and benign breast lesions respectively showed tissue PSA immunoreactivity. No significant difference was observed in the tissue PSA expression between these two groups as also between tissue PSA and known prognostic indicators. As serum PSA levels were below the detection limit (< 0.004 ng/ml) in all except two benign cases, no statistical evaluation was done for the latter. Tissue PSA expression did not correlate with other prognostic markers and detectable serum PSA levels were present in too few cases for statistical analysis. Although no definitive conclusion is possible in this preliminary study regarding the role of PSA in breast disease, it stimulates interest in further research in this direction.
Papillary breast lesions diagnosed on cytology. Profile of 65 cases

Jayaram G, Elsayed EM, Yaccob RB

Acta Cytol., 2007 Jan-Feb;51(1):3-8.
PMID: 17328487

OBJECTIVE: To analyze the cytologic features of nipple discharge and fine needle aspiration (FNA) cytologic smears from breast lesions reported as showing papillary features and to correlate them with histopathologic features.

STUDY DESIGN: The study group consisted of FNA smears and/or nipple discharge smears from 65 breast lesions diagnosed on cytology as duct papilloma, papillary lesion, fibrocystic condition, fibroadenoma, papillary neoplasm or papillary carcinoma. Cytomorphologic features assessed included cellularity, cell pattern (clusters, papillary, 3-dimensionality, etc.) and cell characteristics (monomorphism, pleomorphism, apocrine change, plasmacytoid features). Histological material was available for review and cytohistologic correlation in all cases.

RESULTS: Forty-six specimens were FNA smears, and 16 were nipple discharge smears; in 3 cases FNA and nipple discharge cytologic smears were available for review. Cytologic study could predict the presence of a papillary pattern in all neoplasms with pure or focal papillary differentiation. There was an overlap in cytomorphologic features between papillary and nonpapillary benign lesions as well as between benign and malignant papillary neoplasms. Frank blood in the aspirate, cell dissociation and atypia, however, were more frequent in the last.

CONCLUSION: Overlap of cytologic features in nonneoplastic and neoplastic benign papillary lesions and between benign and malignant papillary neoplasms necessitates histologic evaluation in all cases diagnosed as papillary on cytology. Since 49.2% of lesions showing papillary features on cytology prove to be malignant, all cases reported as papillary on cytology should be excised urgently for histologic assessment.
Carcinosarcoma of the palate: report of a case with a diagnosis of sarcomatoid metastasis by fine needle aspiration cytology

Jayaram G, Elsayed EM

Acta Cytol., 2005 Sep-Oct;49(5):520-4.
PMID: 16334029

BACKGROUND: Carcinosarcoma (sarcomatoid carcinoma) is a rare tumor with a high predilection for the aerodigestive tract. Cytologic diagnosis of metastatic carcinosarcoma has been reported in very few cases.

CASE: An 84-year-old woman presented with a 2-cm-diameter, right cervical lymph node that was referred for fine needle aspiration cytology (FNAC). She had received radiotherapy for a palatal squamous cell carcinoma 2 years earlier. The FNAC smears had a sarcomatoid appearance. Repeat fine needle aspiration was performed, with cytologic and immunocytochemical staining. Careful consideration of the cytologic and immunophenotypic features led to an impression of carcinosarcoma. Histologic sections of the palatal biopsy that had been previously diagnosed as squamous cell carcinoma were reviewed, and a final diagnosis of carcinosarcoma was established.

CONCLUSION: Metastasis of rare lesions, such as carcinosarcoma may be confusing and difficult to diagnose on FNAC, especially when the cytologic sample shows a predominantly sarcomatoid component. The difficulty is compounded when the sarcomatoid component happens to have been overlooked on the initial histologic assessment. With representative cytologic sampling, immunocytochemical staining and review of the histologic material, the correct diagnosis was achieved in this case.
Cytologic evaluation of prognostic markers in breast carcinoma

Jayaram G, Elsayed EM

Acta Cytol., 2005 Nov-Dec;49(6):605-10.
PMID: 16450899

To type breast carcinomaon on fine needle aspiration cytology (FNAC) material and correlate the results with histologic typing, to grade breast carcinoma on FNAC material and correlate the findings with Bloom-Richardson histologic grading, and to determine the estrogen receptor (ER) status in cases of breast carcinoma by immunocytochemical (ICC) staining of FNA cytologic material and correlate the findings with ER status, as determined by immunohistochemical (IHC) staining of tissue sections.

STUDY DESIGN: Seventy-seven cases of breast carcinoma diagnosed on FNAC formed the basis of this study. Typing was done in all cases on the basis of cytologic features and grading in 62. (Fifteen cases were special types of breast carcinoma). In all cases, ER status was determined by immunostaining of cytologic smears. Results of tumor typing, grading and ER status on cytologic material were compared with the results of histologic typing, grading and immunostaining of histologic material obtained from mastectomy or wide excision specimens.

RESULTS: Tumor typing was accurate in 73 of 77 cases (94.8%). Fifteen of 18 cases that were cytologically grade 3 were confirmed on histology, while 3 proved to be grade 2. Of 40 cytologic grade 2 cases, 26 were confirmed on histology, while 14 cases were grade 3. Three of 4 cytologically grade 1 cases were confirmed on histology while 1 was grade 2. The overall accuracy for cytologic grading was 71% (44 of 62 cases). Thirty-seven of 40 ER-positive cases (92.5%) were labeled ER positive on ICC. One case was ER negative on cytology, while in 2 cases the cellularity of the cytologic smear was insufficient to assess ER expression. Thirty-seven cases were negativefor ER on IHC. Nine of these showed ER positivity on ICC, 26 were negative, and 2 had cellularity that was inadequate for assessment of ER. Sensitivity and specificity rates for ER detection on ICC were 97.4% and 74.3%, respectively.

CONCLUSION: Tumor typing, grading and evaluation of ER status on FNA C material in breast carcinomas are simple, quick and moderately reliable techniques that compare and correlate favorably with histologic typing, grading and ER status on IHC.
Leiomyosarcoma of the breast: report of a case with fine needle aspiration cytologic, histologic and immunohistochemical features

Jayaram G, Jayalakshmi P, Yip CH

Acta Cytol., 2005 Nov-Dec;49(6):656-60.
PMID: 16450908

BACKGROUND: Leiomyosarcoma of the breast is a rare neoplasm. We present a case of primary leiomyosarcoma of the breast in a middle-aged female in whom fine needle aspiration cytologic features suggested sarcoma.

CASE: A 55-year-old female presented with a rapidly growing breast lump of 1 month's duration. On examination, an ulcerating, 12 x 10 cm tumor was seen involving the lower medial and lateral quadrants of the right breast. Fine needle aspiration cytology showed variably sized, dissociated and loosely clustered polygonal, plump and spindle cells with pale blue cytoplasm and vesicular nuclei that were round, oval or irregular. Occasional giant forms and nucleolated and mitotic cells were present. A single cluster of benign ductal cells was seen. The tumor cells did not express immunocytologic reactivity to estrogen receptor protein. A cytologic diagnosis of sarcoma was given with differential diagnoses of metaplastic carcinoma and malignant phyllodes tumor. Histologic study established the diagnosis of leiomyosarcoma. Leiomyosarcoma of the breast shows fine needle aspiration cytologic features of sarcoma, but specific tumor typing may not be possible, especially when the cytologic material is inadequate for ancillary staining required to distinguish leiomyosarcoma from metaplastic carcinoma and malignant phyllodes tumor.
Cytology of mucinous carcinoma of breast: a report of 28 cases with histological correlation

Jayaram G, Swain M, Chew MT, Yip CH, Moosa F

Malays J Pathol, 2000 Dec;22(2):65-71.
PMID: 16329537

Pure mucinous carcinoma (MC) of the breast is a relatively uncommon variant of breast carcinoma with distinctive histological and cytological features. In this study we have analysed fine needle aspiration (FNA) cytological material from 28 cases of MC of breast and correlated the cytomorphological features with histopathology. The 28 patients consisted of 27 females and one male patient. 14 patients were Chinese, 10 were Indian and four were Malay. Their ages ranged from 38 to 90 with a mean at 52 years. The left breast was involved in 17 and the right in 11 cases. The duration of the lump varied from two weeks to 10 years. The cytological picture was characterized by abundant extracellular mucin giving a "sea of mucin" or "whirlpools of mucin" effect, in which were seen floating clusters of tumour cells with relatively bland cytological features. Myxo-vascular fragments were seen in 12 cases. Dissociated tumour cells showed a plasmacytoid appearance with eccentric nuclei. In four cases, the mucin was scanty in amount and the cellularity was high while in two cases, the cellularity was very low. Psammoma bodies were seen in cytological smears in one case. Histological study of excision or mastectomy specimens confirmed all 28 cases to be pure MC. Knowledge of the distinctive cytomorphological appearance of MC would enable correct identification of these lesions as malignant and prompt treatment that could further enhance the survival of these prognostically good breast cancers.
Mucinous carcinoma (colloid carcinoma) of the lung diagnosed by fine needle aspiration cytology: a case report

Jayaram G, Yaccob R, Liam CK

Malays J Pathol, 2003 Jun;25(1):63-8.
PMID: 16196380

Mucinous carcinoma of the lung, also known as colloid carcinoma, is an uncommon tumour that is rarely encountered in fine needle aspiration (FNA) cytological practice. A 64-year-old Chinese male presenting with blood stained sputum and hoarseness of voice was discovered to have a 3 cm sized mass in the left lung. Neither bronchial washings nor transthoracic FNA yielded positive results at this stage. Six months later the patient returned to the hospital with a larger tumour and mediastinal lymphadenopathy. Transbronchial lymph node FNA, reported as negative for malignancy showed normal, hyperplastic and mildly atypical bronchial epithelial cells as well as a few single cells and extracellular mucin. Transthoracic FNA of the lung lesion performed under computed tomographic guidance showed characteristic cytological features of this tumour, establishing the diagnosis.
Villoglandular adenocarcinoma of cervix--a tumour with bland cytological features: report of a case missed on cytology

Jayaram G, Razak A

Malays J Pathol, 2003 Dec;25(2):139-43.
PMID: 16196371

The diagnosis of villoglandular adenocarcinoma of cervix on cytological smears is often missed due to the relatively bland cytological features of this tumour. A 45-year-old female with an exophytic cervical growth had three cervical smears reported as unsatisfactory. A cervical biopsy followed by Wertheim's hysterectomy showed a villoglandular adenocarcinoma (VGA) of cervix. Vaginal recurrence of VGA was again missed on the first post-operative vault smear. The second and third vault smears showed characteristic features of VGA that enabled correct identification. Review of some of the smears previously reported as unsatisfactory showed architectural features of VGA in the three dimensional (3-D) fragments that were previously considered to be benign.
Fine needle aspiration cytology of the thyroid--a review of experience in 1853 cases

Jayaram G, Razak A, Gan SK, Alhady SF

Malays J Pathol, 1999 Jun;21(1):17-27.
PMID: 10879275

1853 thyroid lesions subjected to cytological sampling (either by the fine needle aspiration or fine needle capillary sampling technique) from January 1992 to December 1997 at the University Hospital, Kuala Lumpur, were reviewed. Nodular goitre was the most common thyroid lesion needled (67.35%). Among the neoplastic lesions, follicular neoplasms predominated (64%), followed by papillary carcinoma (29.4%). In 325 cases, partial or total thyroidectomy had been done, providing material for histological review and cyto-histological correlation. Cytological diagnosis was found to have high sensitivity and specificity rates of over 75%. Besides, most non-neoplastic thyroid lesions could be diagnosed on cytology. The scope of cytology in the diagnosis of lymphomas, anaplastic and metastatic tumours rendered diagnostic biopsies (or thyroidectomy) unnecessary in these cases. Being a cost-effective technique and having the capacity to provide exact morphological diagnosis in a large variety of thyroid lesions, cytology is obviously the method of choice in the assessment of thyroid nodules.
Papillary cystic type of acinic cell carcinoma of parotid: fine needle aspiration cytological features of a high grade variant with oncocytic metaplasia

Jayaram G, Othman MA, Kumar M, Krishnan G

Malays J Pathol, 2002 Dec;24(2):107-12.
PMID: 12887170

A 60-year-old female developed a right parotid swelling six months after surgery for intra-oral squamous cell carcinoma. Fine needle aspiration (FNA) cytological smears showed dissociated large and small pleomorphic tumour cells with abundant mitoses and oncocytic features. A cytological diagnosis of parotid acinic cell carcinoma (ACC) was made. Histological study of the subtotal parotidectomy specimen showed a papillary cystic variety of acinic cell carcinoma (ACC-PCV). FNA cytological features in this case of ACC-PCV differs from the two previously reported cases in that it showed prominent oncocytic and high grade features and absence of papillary pattern in the cytological smears. ACC-PCV is an uncommon tumour and knowledge of its varied FNA cytological features is important for the diagnosis of this neoplasm.
Malignant teratoma of the thyroid with predominantly neuroepithelial differentiation. Fine needle aspiration cytologic, histologic and immunocytochemical features of a case

Jayaram G, Cheah PL, Yip CH

Acta Cytol., 2000 May-Jun;44(3):375-9.
PMID: 10833994

BACKGROUND: Teratoma of the thyroid in adults is extremely rare, and most are malignant. Only nine cases have been adequately documented in the English-language literature, and there are no reports detailing the fine needle aspiration (FNA) cytologic characteristics.

CASE: A 32-year-old female presented with a left-sided nodular thyroid mass with left cervical lymphadenopathy. FNA cytology of the thyroid and lymph nodes was done. The cytologic and immunocytochemical features were that of a small round cell tumor with neuroepithelial (NE) differentiation, metastasizing to the cervical nodes. Microscopic study of the thyroidectomy specimen showed a tumor showing an NE pattern with occasional islands of squamous and cuboidal epithelium, leading to a diagnosis of malignant teratoma.

CONCLUSION: Knowledge of FNA cytologic features of rare but highly malignant lesions like thyroid teratomas allow early recognition so that suitable and possibly aggressive treatment protocols can be adopted in the hope of prolonging survival.
Fine needle aspiration cytology of lymph nodes in HIV-infected individuals

Jayaram G, Chew MT

Acta Cytol., 2000 Nov-Dec;44(6):960-6.
PMID: 11127753

OBJECTIVE: To assess the role of fine needle aspiration cytology (FNAC) in lymphadenopathy in human immunodeficiency virus-infected individuals (HIVII).

STUDY DESIGN: Thirty-nine HIVII presenting with lymphadenopathy at University Hospital, Kuala Lumpur, were subjected to FNAC. Cytologic smears were routinely stained with May-Grünwald-Giemsa stain. Special stains and immunostains were used when necessary.

RESULTS: In nine cases, the cytologic appearance was compatible with HIV type A and in one case with HIV type C lymphadenopathy. In 21 cases, acid-fast bacilli (AFB) were demonstrated in the cytologic smears, enabling a diagnosis of mycobacterial lymphadenitis. In one of these cases there was a concomitant infection with Penicillium marneffei that was overlooked on initial cytologic examination. The cause of granulomatous lymphadenitis could not be ascertained in one case, where neither AFB nor any other organisms were demonstrable. Two cases of histoplasma and one of cryptococcal lymphadenitis were diagnosed, as was one high grade non-Hodgkin's lymphoma that could be immunophenotyped on cytologic material. In three cases the aspirates were inadequate for a cytologic diagnosis.

CONCLUSION: Lymph node FNAC is a valuable investigative modality in HIVII. Most opportunistic infections (bacterial and fungal) can be correctly identified, and high grade lymphoma can be diagnosed and phenotyped.
Mucoepidermoid carcinoma of the thyroid: a case report

Jayaram G, Wong KT, Jalaludin MA

Malays J Pathol, 1998 Jun;20(1):45-8.
PMID: 10879264

Primary mucoepidermoid carcinoma (MEC) of thyroid is an uncommon tumour and reports on its' cytology are consequently scanty. A 46-year-old male presented with a thyroid nodule of nine months duration. Fine needle aspiration (FNA) cytology of the nodule showed features of a malignant tumor that was different from the usual types of thyroid carcinoma. Monolayers and syncytial clusters of round and spindle tumour cells with large vesicular nuclei and single macronucleoli were present. A diagnosis of carcinoma was given with the comment that this was unlike any of the usual types of thyroid cancer and that a metastatic malignancy should be ruled out. The cytological picture of MEC may not always be distinctive enough for accurate tumour typing. Nevertheless the cytological features are usually sufficiently different to rule out all of the usual types of thyroid carcinoma. This distinction may be important from the point of view of differing prognosis in MEC of thyroid (as compared to differentiated thyroid cancers) and the need to exclude a metastatic carcinoma, especially from a primary in one of the salivary glands.

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