Rapid Growing Intramuscular Myxoma Mimicking a Peripheral Nerve Sheath Tumor

Abstract

    We present a rare case of rapid growing intramuscular myxoma mimicking a peripheral nerve sheath tumor (PNST). During diagnostic investigations for abdominal pain in a 65-year-old female patient a 5.5 cm diameter tumor in the left buttock was found incidentally. The tumor was septated and hyperintense in the T2-weighted images in the left gluteal region, adjacent to the sciatic nerve, presumed to be a PNST. The follow up images four months later showed marked gain of the tumor size. The tumor has been resected completely and histopathological examination revealed the diagnosis of an intramuscular myxoma. As an uncommon benign tumor, intramuscular myxoma presented very suspiciously for a PNST because of direct adjacency to the sciatic nerve with an increased growth tendency. Despite the benign entity of intramuscular myxoma surgical treatment was indicated because of the rapid growth and unclear circumstances with the possibility of malignant behavior.




 doi:10.4021/jnr22w