Large aneurysms involving the vertebral arteries are rare. For this reason it seems desirable to record a case of a particularly large aneurysm which gave signs of a tumor of the posterior fossa, as well as to review the recorded cases with the object in mind of elucidating a group of signs which can be regarded as characteristic of the disorder.
Since Cruveilhier1 published his case of aneurysm of the vertebral artery in 1835, 72 cases of aneurysm of the intracranial portion of the vertebral arteries have been reported. Many of the earlier papers merely cite the occurrence of the aneurysm and include few, or no, clinical and postmortem observations.
REPORT OF CASE
History.
—W. E., a man aged 44, was admitted to the Jefferson Medical College Hospital on Oct. 14, 1942 with symptoms of four months' duration. At the onset of his illness he experienced left frontal headache,