MyMedR

Fulltext 3D-Printed Coronary Plaques to Simulate High Calcification in the Coronary Arteries for Investigation of Blooming Artifacts

Sun Z, Ng CKC, Wong YH, Yeong CH

Biomolecules, 2021 09 03;11(9).

PMID: 34572520 DOI: 10.3390/biom11091307

The diagnostic value of coronary computed tomography angiography (CCTA) is significantly affected by high calcification in the coronary arteries owing to blooming artifacts limiting its accuracy in assessing the calcified plaques. This study aimed to simulate highly calcified plaques in 3D-printed coronary models. A combination of silicone + 32.8% calcium carbonate was found to produce 800 HU, representing extensive calcification. Six patient-specific coronary artery models were printed using the photosensitive polyurethane resin and a total of 22 calcified plaques with diameters ranging from 1 to 4 mm were inserted into different segments of these 3D-printed coronary models. The coronary models were scanned on a 192-slice CT scanner with 70 kV, pitch of 1.4, and slice thickness of 1 mm. Plaque attenuation was measured between 1100 and 1400 HU. Both maximum-intensity projection (MIP) and volume rendering (VR) images (wide and narrow window widths) were generated for measuring the diameters of these calcified plaques. An overestimation of plaque diameters was noticed on both MIP and VR images, with measurements on the MIP images close to those of the actual plaque sizes (<10% deviation), and a large measurement discrepancy observed on the VR images (up to 50% overestimation). This study proves the feasibility of simulating extensive calcification in coronary arteries using a 3D printing technique to develop calcified plaques and generate 3D-printed coronary models.

Matched MeSH terms: Calcinosis/pathology*

A TAXONOMIC STUDY OF THE GENUS PADINA (DICTYOTALES, PHAEOPHYCEAE) INCLUDING THE DESCRIPTIONS OF FOUR NEW SPECIES FROM JAPAN, HAWAII, AND THE ANDAMAN SEA(1)

Win NN, Hanyuda T, Arai S, Uchimura M, Prathep A, Draisma SG, et al.

J Phycol, 2011 Oct;47(5):1193-209.

PMID: 27028247 DOI: 10.1111/j.1529-8817.2011.01054.x

A taxonomic study of the genus Padina from Japan, Southeast Asia, and Hawaii based on morphology and gene sequence data (rbcL and cox3) resulted in the recognition of four new species, that is, Padina macrophylla and Padina ishigakiensis from Ryukyu Islands, Japan; Padina maroensis from Hawaii; and Padina usoehtunii from Myanmar and Thailand. All species are bistratose and morphologically different from one another as well as from any known taxa by a combination of characters relating to degree of calcification; the structure, position, and arrangement of hairlines (HLs) and reproductive sori; and the presence or absence of rhizoid-like groups of hairs and an indusium. Molecular phylogenetic analyses demonstrated a close relationship between P. ishigakiensis, P. macrophylla, P. maroensis, and Padina australis Hauck. The position of P. usoehtunii, however, was not fully resolved, being either sister to a clade comprising the other three new species and P. australis in the rbcL tree or more closely related to a clade comprising several other recently described species in the cox3 tree. The finding of the four new species demonstrates high species diversity particularly in southern Japan. The following characters were first recognized here to be useful for species delimitation: the presence or absence of small rhizoid-like groups of hairs on the thallus surface, structure and arrangement of HLs on both surfaces either alternate or irregular, and arrangement of the alternating HLs between both surfaces in equal or unequal distance. The evolutionary trajectory of these and six other morphological characters used in species delineation was traced on the phylogenetic tree.

Matched MeSH terms: Calcinosis

A system of microcalcifications detection and evaluation of the radiologist: comparative study of the three main races in Malaysia

Al-Qdah M, Ramli AR, Mahmud R

Comput Biol Med, 2005 Dec;35(10):905-14.

PMID: 16310014

This paper uses wavelets in the detection comparison of breast cancer among the three main races in Malaysia: Chinese, Malays, and Indians followed by a system that evaluates the radiologist's findings over a period of time to gauge the radiologist's skills in confirming breast cancer cases. The db4 wavelet has been utilized to detect microcalcifications in mammogram-digitized images obtained from Malaysian women sample. The wavelet filter's detection evaluation was done by visual inspection by an expert radiologist to confirm the detection results of those pixels that corresponded to microcalcifications. Detection was counted if the wavelet-detected pixels corresponded to the radiologist's identified microcalcification pixels. After the radiologist's detection confirmation a new client-server radiologist recording and evaluation system is designed to evaluate the findings of the radiologist over some period of cancer detection working time. It is a system that records the findings of the Malaysian radiologist for the presence of breast cancer in Malaysian patients and provides a way of registering the progress of detecting breast cancer of the radiologist by tracking certain metric values such as the sensitivity, specificity, and receiver operator curve (ROC). The initial findings suggest that no single race mammograms are easier for wavelets' detections of microcalcifications and for the radiologist confirmation even though for this study the Chinese race samples detection average were a few percentages less than the other two races, namely the Malay and Indian races.

Matched MeSH terms: Calcinosis/radiography*

Accuracy of 64-row multidetector computed tomography in detecting coronary artery disease in 134 symptomatic patients: influence of calcification

Ong TK, Chin SP, Liew CK, Chan WL, Seyfarth MT, Liew HB, et al.

Am Heart J, 2006 Jun;151(6):1323.e1-6.

PMID: 16781246

The new 64-row multidetector computed tomography (CT)-assisted angiography can now detect coronary artery disease with shorter breath-hold time and at faster heart rates for symptomatic patients. We aim to determine if the 64-row scanner can also overcome limitations due to mild to moderate calcification.

Matched MeSH terms: Calcinosis/complications; Calcinosis/radiography*

Acute calcific tendinitis of gluteus maximus tendon due to tumoral calcium pyrophosphate dihydrate deposition disease

Lim CH, Lin CT, Chen YH

Int J Rheum Dis, 2017 Dec;20(12):2249-2252.

PMID: 28036155 DOI: 10.1111/1756-185X.12969

Matched MeSH terms: Calcinosis/diagnosis; Calcinosis/etiology*; Calcinosis/therapy; Chondrocalcinosis/complications*; Chondrocalcinosis/diagnosis; Chondrocalcinosis/therapy

Fulltext Adrenal cortical carcinoma masquerading as pheochromocytoma: a case report

Ni H, Htet A

Ecancermedicalscience, 2012;6:277.

PMID: 23152728 DOI: 10.3332/ecancer.2012.277

Adrenocortical carcinoma (ACC) is a malignant tumour arising from the adrenal cortex, while pheochromocytoma is a catecholamine secreting tumour of the adrenal medulla or extra adrenal sites. Both conditions are very rare, with incidence of approximately 1-2 cases per million adults annually. Most adrenocortical tumours are functioning. ACC can be associated with clinical Cushing syndrome and virilisation due to excessive production of cortisol and androgens, respectively. However, it is rare for ACC to present clinically as pheochromocytoma. We report a case of a 28-year-old lady who presented with paroxysmal hypertension and palpitations associated with raised urinary vanillyl mandelic acid. On examination, there was postural hypotension and ballotable mass in right lumbar region with no obvious features suggestive of Cushing syndrome or virilisation. A huge right suprarenal mass with areas of necrosis and calcification was noted on the abdomen CT. A right adrenalectomy was done. The histology was consistent with ACC. There are reported cases of ACC presenting with clinical features of pheochromocytoma but limited in number, accounting for barely a dozen cases in the literature. This pseudopheochromocytoma may be due to the presence of neuroendocrine features in ACC.

Matched MeSH terms: Calcinosis

Adrenal tuberculosis: the atypical presentations of eggshell-like calcifications

Imisairi AH, Hisham AN

ANZ J Surg, 2009 Jun;79(6):488-9.

PMID: 19566876 DOI: 10.1111/j.1445-2197.2009.04953.x

Matched MeSH terms: Calcinosis/radiography*

Association of coronary artery calcium score with calcification and degree of stenosis: An autopsy study

Kaur M, Rahimi R, Razali F, Mohd Noor N, Omar E, Abdul Manaf Z, et al.

Malays J Pathol, 2019 Aug;41(2):177-183.

PMID: 31427553

INTRODUCTION: Coronary artery disease (CAD) is a known cause of major cardiovascular events and calcium score (CS) has been developed as a marker of coronary atherosclerosis. Yet, the relationship between post mortem computed tomography (PMCT) CS with histologically observed calcification and the severity of coronary artery stenosis has not been widely explored and is still unclear. This study aims to determine the association between coronary artery PMCT CS with histologically observed calcification and degree of stenosis of coronary arteries in post-mortem cases.

MATERIALS & METHODS: This was a cross-sectional study involving 101 subjects recruited from the National Institute of Forensic Medicine (IPFN) Hospital Kuala Lumpur (HKL) over a period of 15 months, from December 2012 until April 2014. PMCT CS of the coronary arteries was calculated using Agatston-Janowitz score. Histological presence of calcification was observed and the degree of stenosis was calculated using an image analysis technique.

RESULTS: PMCT CS increased with increasing severity of stenosis (p<0.001). PMCT CS showed a positive correlation with the presence of calcification (r=-0.82, p<0.001).

CONCLUSION: Calcium score is strongly associated with coronary artery calcification and the degree of luminal stenosis in post mortem subjects. Thus, PMCT may be useful as a non-invasive tool in diagnosing CAD in the event that an autopsy is not possible.

Matched MeSH terms: Calcinosis

Fulltext Benign calcified thyroglossal duct cyst, - defying the hallmark of papillary carcinoma, 4th case reported in literature

Al-Yahya, S.N., Marina, M.B., Lye, M.H., Loo, C.P.

International Medical Journal Malaysia, 2017;16(2):117-120.

MyJurnal

Thyroglossal duct cyst is the most common upper neck midline lesion in children. Approximately 1% of
thyroglossal duct cyst undergoes malignant transformation. Calcification which is a marker of malignancy
almost always points out to papillary thyroid carcinoma. Benign case of calcified thyroglossal cyst maybe
undiagnosed or under reported. We report a case of a 5 year old girl with a benign calcified thyroglossal
duct cyst, a fourth case in world literature. Here the differences between a benign and malignant
thyroglossal duct cyst are discussed.

Matched MeSH terms: Calcinosis

Brain calcification in patients with cerebral lupus

Raymond AA, Zariah AA, Samad SA, Chin CN, Kong NC

Lupus, 1996 Apr;5(2):123-8.

PMID: 8743125 DOI: 10.1177/096120339600500207

Cerebral lupus (CL) is a common cause of morbidity and mortality in patients with SLE. The brain CTs of 27 consecutive adult patients with SLE and various neurological presentations were reviewed. The median age and duration of neurological symptoms at the time of the brain CT were 30 years (range = 14-51 years) and six days (range = 1 day-22 years), respectively. Eleven patients (41%) had normal CTs. The abnormalities in the remaining patients could be divided into six categories: (a) cerebral atrophy alone (two patients); (b) calcification alone (three patients); (c) infarct(s) alone (five patients); (d) cerebral atrophy and calcification (three patients); (e) cerebral atrophy and infarct(s) (one patient) and (f) cerebral atrophy, calcification and infarct(s) (two patients). Altogether eight patients (30%) (age range = 17-47 years) had intracerebral calcification: the globus pallidus was involved in all, putamen in two, head of the caudate nucleus in one, thalamus in one, centrum semiovale in two and cerebellum in three patients. Two patients had extensive calcifications of most of the basal ganglia, centrum semiovale and cerebellum. There was no relationship between the presence/degree of calcification and age of patients/duration or type of neurological presentation. The pathogenesis of cerebral calcification in CL is unknown. Cerebral lupus must now be included in the differential diagnosis of intracerebral calcification.

Matched MeSH terms: Calcinosis/pathology*

Calcareous deposits in the subdeltoid bursa

Tan KC

Journal of the Malaya Branch of the British Medical Association, 1941;5:60-1.

Matched MeSH terms: Calcinosis

Calcific pancreatitis: the Indian plague

Rupa B, Rao GV, Nageshwar R

Med J Malaysia, 2005 Jul;60 Suppl B:99-100.

PMID: 16108186

Matched MeSH terms: Calcinosis/classification; Calcinosis/diagnosis*; Calcinosis/physiopathology

Fulltext Calcification of the Alar Ligament Mimics Fracture of the Craniovertebral Junction (CVJ): An Incidental Finding from Computerised Tomography of the Cervical Spine Following Trauma

Che Mohamed SK, Abd Aziz A

Malays J Med Sci, 2009 Oct;16(4):69-72.

PMID: 22135515 MyJurnal

When performing a radiological assessment for a trauma case with associated head injury, a fragment of dense tissue detected near the craniovertebral junction would rapidly be assessed as a fractured bone fragment. However, if further imaging and evaluation of the cervical spine with computerised tomography (CT) did not demonstrate an obvious fracture, then the possibility of ligament calcification would be considered. We present a case involving a previously healthy 44-yearold man who was admitted following a severe head injury from a road traffic accident. CT scans of the head showed multiple intracranial haemorrhages, while scans of the cervical spine revealed a small, well-defined, ovoid calcification in the right alar ligament. This was initially thought to be a fracture fragment. Although such calcification is uncommon, accident and emergency physicians and radiologists may find this useful as a differential diagnosis in patients presenting with neck pain or traumatic head injury.

Matched MeSH terms: Calcinosis

Fulltext Calcified pseudomeningocele of the lumbar spine: a review

Narverud SF, Ramli NB, Chandran H, Ganesan D

Eur Spine J, 2013 May;22 Suppl 3:S443-9.

PMID: 23233216 DOI: 10.1007/s00586-012-2610-7

In this article, we review the English literature of calcified pseudomeningoceles in the lumbar region.

Matched MeSH terms: Calcinosis/pathology*

Fulltext Calcified vertical plate of the cricoid--a rare pitfall in the diagnosis of an oesophageal foreign body

Arasaratnam S, Abdullah BJJ, Fernandez V

Med J Malaysia, 1998 Sep;53(3):290-2.

PMID: 10968170

We present a case of rare pitfall in the diagnosis of an oesophageal foreign body due to the calcified vertical plate of the cricoid to highlight the need to be aware of this entity to avoid unnecessary morbidity.

Matched MeSH terms: Calcinosis/diagnosis*; Calcinosis/pathology; Calcinosis/radiography; Calcinosis/surgery

Calcifying and keratinizing ameloblastoma of the maxilla

Siar CH, Ng KH

J Laryngol Otol, 1991 Nov;105(11):971-2.

PMID: 1722237

A case is described of ameloblastoma of maxilla presenting with numerous calcified keratin pearls. The significance of cellular variation in relation to the behavioural potential of the ameloblastoma in general is briefly discussed.

Matched MeSH terms: Calcinosis/pathology

Calcifying fibroblastic granuloma. A case report

Taiyeb Ali TB, Siar CH

J N Z Soc Periodontol, 1997.

PMID: 9522721

Matched MeSH terms: Calcinosis/pathology*

Calcinosis of hand and axilla in polymyositis/dermatomyositis

Zulkifli A

Med J Malaysia, 1979 Jun;33(4):362-4.

PMID: 522752

Matched MeSH terms: Calcinosis/drug therapy; Calcinosis/etiology*

Calcium score of coronary artery stratifies the risk of obstructive coronary artery diseases

Ibrahim O, Oteh M, Anwar IR, Che Hassan HH, Choor CK, Hamzaini AH, et al.

Clin Ter, 2013;164(5):391-5.

PMID: 24217823 DOI: 10.7417/CT.2013.1601

Coronary heart disease is a major health problem in Malaysia with high morbidity and mortality. Common primary screening tool of cardiovascular risk stratification is exercise treadmill test (ETT). This communication is to determine the performance of coronary artery calcium score a new method to stratify the presence of obstructive coronary artery disease (CAD) in comparison to traditional ETT in patients having coronary artery diseases.

Matched MeSH terms: Calcinosis/epidemiology*; Calcinosis/radiography

Coronary artery calcium and you - do you know where you stand?

Chin SP, Ng CK, Sim KH

Indian Heart J, 2007 May-Jun;59(3):211-3.

PMID: 19124927

Matched MeSH terms: Calcinosis/radiography*

Displaying publications 1 - 20 of 55 in total