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January 1982

Diagnosis of Thrombotic Giant Basilar Artery Aneurysm on Computed Tomographic Scan

Arch Neurol. 1982;39(1):64-65. doi:10.1001/archneur.1982.00510130066021

We report a partially thrombotic giant basilar artery aneurysm that was detected with computed tomographic (CT) scans and confirmed by angiography.

REPORT OF A CASE  A 51-year-old man experienced a leftsided headache in October 1975, three years before admission to a hospital. Three months later, he had a syncopal attack. A CT scan was reported to be normal. One year later, an attack of diplopia, nausea, and vomiting lasted for three days. At that time, examination showed a blood pressure of 250/150 mm Hg, nystagmus, and ataxia. Cerebrospinal fluid was under a pressure of 300 cm H2O, without other abnormalities. A large mass in the posterior fossa with hydrocephalus was evident on a CT scan. A ventriculoperitoneal shunt procedure was carried out, followed by CT scans with and without intravenous (IV) injection of contrast medium. The noncontrast scan disclosed a large mass in the posterior fossa (Fig 1), with an