Case report

Giant inframuscular lipoma disclosed 14 years after a blunt trauma: A case report

Giuseppe Nigri , Mario Dente , Stefano Valabrega , Giacomo Beccaria , Paolo Aurello , Francesco D'Angelo , Francesco Di Marzo and Giovanni Ramacciato

Department of Surgery, Sapienza University of Rome, 2nd School of Medicine, St. Andrea Hospital, Rome, Italy

author email corresponding author email

Journal of Medical Case Reports 2008, 2:318doi:10.1186/1752-1947-2-318

Published:	30 September 2008

Abstract

Introduction

Lipoma is the most frequent benign tumor of the soft tissue. This lesion is often asymptomatic except in cases of enormous masses compressing nervous-vascular structures. Although the diagnosis is mostly clinical, imaging tools are useful to confirm the adipose nature of the lesion and to define its anatomic border. Sometimes, lipomas may be the result of a previous trauma, such as in this patient.

Case presentation

A 45-year-old man presented at our institution with a giant hard firm mass in the upper external quadrant of the right buttock disclosed after a weight loss diet. Subsequent magnetic resonance imaging showed a giant adipose mass developed beneath the large gluteal muscle and among the fibers of the medium and small gluteal muscles. When questioned on his medical history, the patient reported a blunt trauma of the lower back 14 years earlier. He underwent surgery and histological examination confirmed a giant lipoma.

Conclusion

Lipomas might result from a previous trauma. It is hypothesized that the trigger mechanism is activated by cytokine and growth factors released after the trauma. We herein present an exceptional case of a giant post-traumatic lipoma which caused a painful compression on the right sciatic nerve.