# An Uncommon Cause of Hip Pain Originating From the Iliopsoas Muscle: A Case Report

## TL;DR

A rare case of rhabdomyosarcoma in the iliopsoas muscle causing hip pain is reported, highlighting the importance of thorough diagnosis.

## Contribution

This case report presents a rare occurrence of rhabdomyosarcoma in the iliopsoas muscle in an adult.

## Key findings

- A 43-year-old man was diagnosed with pleomorphic rhabdomyosarcoma in the iliopsoas muscle.
- The patient showed no recurrence after 2 years of follow-up following successful excision of the mass.
- Only one prior case of rhabdomyosarcoma in the iliopsoas region has been reported in the literature.

## Abstract

A 43-year-old man presented with chronic left hip pain that had increased in severity in the last week. Imaging studies discovered a mass in the iliopsoas muscle. The mass was excised, and pathological examination revealed pleomorphic rhabdomyosarcoma. The patient was followed up for 2 years and demonstrated no recurrence, with good clinical results. Clinicians should follow a systematic diagnostic approach involving a detailed medical history, a comprehensive physical examination, imaging studies, and laboratory tests to evaluate masses in the iliopsoas region, leading to timely diagnosis and appropriate management. Rhabdomyosarcoma is already a rare malignancy in adults. Therefore, having it in the iliopsoas compartment makes this case unique. To our knowledge, there was only one previously reported case of rhabdomyosarcoma involving the iliopsoas.