Abstract
A rare case of the leiomyomatous variant of embryonal rhabdomyosarcoma is reported. A 13-year-old boy presented with a recurrent painless mass on the ventral side of the right forefoot. Microscopically, the tumor consisted of spindle-shaped and round tumor cells in a fascicular or storiform, focally hemangiopericytoma-like growth pattern. The cytoplasm of the spindle-shaped tumor cells was eosinophilic and fibrillary, in some areas resembling smooth muscle cells. Immunohistologically, all tumor cells were vimentin-positive, most of them also stained with antibodies to desmin and muscle specific actin (MSA). In addition, many tumor cells showed a co-expression of alpha-sarcomeric actin and myoglobin. All tumor cells were negative with alpha-smooth muscle actin. Two years after surgical treatment and chemotherapy the patient is well with no evidence of distant metastases. The clinicopathological features and differential diagnostic problems are discussed.
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