Magnetic resonance angiography of giant aneurysms. Pitfalls and surgical implications.

Objective: Magnetic resonance angiography (MRA) can be used to identify cerebral aneurysms. In this report, techniques for the diagnosis of giant cerebral aneurysm using MRA are discussed. Pitfalls in the diagnosis are presented.

Cystic meningiomas: a review.

Cystic meningiomas are uncommon tumors that are easily confused with metastatic or glial tumors that have cystic components. We have retrospectively reviewed all of the meningiomas operated on at the University of Puerto Rico in a 5-year period (1989-1993) and found only five cystic meningiomas (4.3% of total meningiomas).

Thoracic spine osteochondroma causing spinal cord compression. An unusual cause of paraparesis.

A case of a thoracic osteochondroma with compression of the spinal cord is reported. The neuroimaging studies are described.

Pleomorphic xanthoastrocytoma with invasion of the tentorium and falx.

A case of a 21-year-old patient with a recurrent pleomorphic xanthoastrocytoma with invasion of the tentorium and falx cerebri is reported. Dural attachment has been reported in some cases. Invasion of the dura of the falx cerebri and complete infiltration of the left tentorium by the tumor were found intraoperatively.

Sudden appearance of multiple brain lesions in Aids after a cerebral biopsy. Case report.

A unique case of cerebral toxoplasmosis which had an acute appearance of multiple discrete lesions following a biopsy and its neuroradiological findings are reported in detail. Possible pathophysiological mechanism are presented.