A Low-Grade Fibromyxoid Sarcoma of the Internal Abdominal Oblique Muscle

Abstract EN

A low-grade fibromyxoid sarcoma (LGFMS) is a rare tumor, with a benign histologic appearance but malignant behavior.

This report describes a 74-year-old man with an internal abdominal oblique muscle mass.

The tumor appeared as a well-defined ovoid mass on computed tomography, with mild uptake on fluorine-18-fluorodeoxyglucose positron-emission tomography images.

Radical resection with wide safe margins was performed.

Histologically, the tumor was composed of spindle-shaped cells in a whorled growth pattern, with alternating fibrous and myxoid stroma.

MUC4 expression, a highly sensitive and specific immunohistochemical marker for LGFMS, was detected.

Therefore, we diagnosed the tumor as LGFMS.

At the 3-month follow-up, there was no sign of recurrence or metastasis.

We report the first case of LGFMS arising from the internal abdominal oblique muscle.