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Case Reports in Surgery
Volume 2016 (2016), Article ID 8524030, 4 pages
Case Report

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

1Department of Surgery, Chuden Hospital, 3-4-27 Otemachi, Naka-Ku, Hiroshima 730-8562, Japan
2Department of Diagnostic Pathology, Kochi Health Sciences Center, 2125-1 Ike, Kochi 781-8555, Japan
3Department of Pathology, Chuden Hospital, 3-4-27 Otemachi, Naka-Ku, Hiroshima 730-8562, Japan

Received 19 November 2015; Accepted 24 April 2016

Academic Editor: Christophoros Foroulis

Copyright © 2016 Masakazu Hashimoto et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.