Fibromyxoma of the Petrous Bone: A Case Report

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Myxomas are uncommon tumors typically located in the left atrium of the heart, bones of the jaw or skeletal muscle. We present a rare case of fibromyxoma in the petrous bone. A 9-year-old boy complained of a protrusion and tenderness in the left postaurieular area. Neurological and otorhinolaryngological examination did not reveal any abnormality. Computed tomography and magnetic resonance imaging revealed a well-demarcated, solid tumor with a size of 62 X92 X80 mm. Calcification and petrous bone destruction was evident, and the lesion showed heterogeneous enhancement with contrast media. Thallium-201 single photon emission computed tomography (SPECT) and Technetium-99m muramyl dipeptide bone scintigraphy revealed high uptake in the tumor. Early and delayed images of technetium-99m-diethylene triaminepentaacetic acid-human serum albumin SPECT disclosed no definite uptake in the tumor. Cerebral angiographyrevealed marked extracerebral mass effect and mild vascular supply of the tumor from the left ascending pharyngeal artery, suggesting occlusion of the left sigmoid sinus. Total radical resection of the tumor was carried out. The tumor was totally extradural, yellow-whitish in color, elastic soft, jelly-like, bloodless and resectable. The histological diagnosis was fibromyxoma.
2009-03-01