Osteolipoma Presenting as a Deep-Seated Intermuscular Mass: Case Report of a Rare Clinical Entity

Abstract

Osteolipoma is an extremely rare histological variant of lipoma, characterized by the presence of mature osseous elements within a benign fatty tumor. We report the case of a 60-year-old woman patient who presented with a slowly enlarging four-year-old, painless mass in the left forearm. Diagnostic imaging, including ultrasound and magnetic resonance imaging (MRI), suggested a lipomatous tumor with calcification. Surgical excision was performed. Histopathological examination confirmed the diagnosis of osteolipoma, showing mature adipose tissue interspersed with trabeculae of lamellar bone. This report highlights the clinical, radiological, and histopathological features of this rare entity and reviews the current literature.