A rarely seen lipoma variant: Osteochondrolipoma: Case report

Abstract

Lipomas which are the most common tumors of the soft tissue can be often accompanied by fibrous tissue, blood vessels, smooth muscle, myxoid areas; and they rarely contain bone marrow, chondroid nodules and bone formation areas. Lipomas containing both bony and chondroid areas are extremely rare and have been reported most commonly in head, neck and intraoral areas. A 54 year- old female patient had a 7 cm -long subcutaneous mass in the forearm which was discovered five years ago. USG and MR findings had indicated lipoma. Radiologic examinations performed due to recently hardened painful mass revealed an atypical lipoma raising the suspicion of low grade liposarcoms. As the spindle- cell areas in the fatty tissue were seen in the tru-cut biopsy material, total excision was applied for differential diagnosis. Histopathological examination of the material, the lesion was reported as osteochondrolipoma. Osteochondrolipomas have been accepted as a variant of conventional lipomas as a result of the cytogenetic studies. It might be difficult to diagnose this very rarely seen osteochondrolipomas in the tru-cut or small biopsy specimens. Both clinically, radiologically and histopatho-logically differential diagnosis might be difficult. This case is the 6th OCL case which has been reported in the literature so far, and the first case in the forearm area. © 2016, Logos Medical Publishing. All rights reserved.