# Giant pleomorphic lipoma in patient with multiple osteochondromatosis

## TL;DR

A 45-year-old man had a large tumor in his shoulder area that was initially thought to be cancerous but was later diagnosed as a rare type of benign lipoma.

## Contribution

This case highlights the diagnostic challenge of distinguishing pleomorphic lipoma from liposarcoma using imaging alone.

## Key findings

- The tumor was initially misdiagnosed as liposarcoma based on MRI findings.
- Surgical resection and histopathological analysis confirmed the diagnosis of pleomorphic lipoma.
- The patient's quality of life improved after the tumor was removed.

## Abstract

Pleomorphic lipomas are infrequent soft tissue tumours with pseudosarcomatous behaviour. Their polymorphism provides them certain characteristics that may resemble malignancy, which may mislead the initial diagnosis. The presented case report is a 45-year-old man with a giant growing tumour on the left cervicoscapular region initially categorised as a liposarcoma by magnetic resonance with a final confirmed diagnosis of pleomorphic lipoma after the surgical resection and the examination of the pathologist. The patient presented important functional restriction of the upper left extremity, which decreased after surgical resection, improving the quality of life.