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Partially sectioned embedded temporal bone from patient with a cholesterol granuloma (cyst and fat) drained into the mastoid by an angiocath (ac). Temporal mandibular joint (tmj), Eustachian tube (et), external auditory canal (eac), tympanic membrane (mt), middle ear (me) carotid artery, one segment containing clotted blood (ca). (Hematoxylin and Eosin [H&E] X 5)
