Spontaneous hemorrhage into the lateral part of the pons with sequelae compatible with survival has been documented previously. The author describes an unusual case with spontaneous hemorrhage into the lateral pons, with intraneural extension into the right trigeminal nerve root. Radiological features were of an expanding mass of the cerebellopontine angle. The patient was treated surgically with success.
A case is described of subdural spinal lipoma with posterior fossa extension and the world literature is reviewed. A high proportion of high cervical lipomas extend into the posterior cranial fossa. Many cases were probably missed in the pre-computed tomography era. Those cases with posterior fossa growth are more likely to be found in infants or those cases with symptoms dating from birth; most present with quadriparesis. All cases of high cervical lipoma demonstrated by myelography should be submitted to brain computed tomography in order to exclude posterior fossa extension and demonstrate the presence of hydrocephalus.