Teratoma of the Middle Ear and Mastoid Process: A Case With Aberrant Innervation of the Facial Musculature

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Abstract
TERATOMAS are true tumors composed of various tissues of a kind foreign to the area in which they arise. The most common sites of teratomas are, in order of frequency, the ovaries, testes, retroperitoneal region, anterior mediastinum, presacral and coccygeal region, and base of the skull. Rare sites are the brain and neck. Teratomas of the ear have not been mentioned by Willis in an extensive review of the subject.1 With relatively few exceptions, teratomas arise in tissues which developmentally occupy immediately preaxial median or nearly median positions. A review of the world literature since 1917 reveals five reported teratomas in the region of the ear. Adam and Gilmour reported a teratoid tumor of the external auditory canal.2 Carli and André3 observed a huge teratoma arising from the mastoid process in a newborn, and a congenital teratoma of the temporal bone was described by Pavlica.4 The

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