EXTENSIVE review of the literature and consultation with experienced surgeons1,2 (oral communications from C. M. Kos, T. N. Steffen, and M. Van Allen, June 1968) has failed to unearth any previous report of a congenital aneurysm of the internal carotid artery in the middle ear. The authors have recently encountered such a lesion in a 9-year-old girl.
Intracranial aneurysms are not uncommon. In a series of 2,786 autopsies, "berry" aneurysms of the circle of Willis were encountered in 137 patients, an incidence of 4.9%.3 The most frequent location for these aneurysms is in the anterior part of the circle. Some of the favorite sites are the junction of the internal carotid and posterior communicating arteries, the anterior cerebral and anterior communicating region, and on the middle cerebral artery. Those on the internal carotid artery by itself constitute about 27% of the total number. The other above mentioned sites
Stallings JO, McCabe BF. Congenital Middle Ear Aneurysm of Internal Carotid. Arch Otolaryngol. 1969;90(1):39–43. doi:10.1001/archotol.1969.00770030041009
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