# Ossifying fasciitis of the proximal lower extremity

## TL;DR

A 23-year-old woman had a rare benign tumor called ossifying fasciitis in her thigh, highlighting its importance in diagnosing soft tissue masses.

## Contribution

This case adds to the limited clinical understanding of ossifying fasciitis and emphasizes its diagnostic relevance.

## Key findings

- Ossifying fasciitis was diagnosed in a nontraumatic proximal thigh mass in a young female.
- The case underscores the need to include ossifying fasciitis in the differential diagnosis of soft tissue tumors.

## Abstract

Ossifying fasciitis is a rare benign tumor of heterotopic bone formation within fascial tissue. We present a case of a 23-year-old female with a nontraumatic painful mass of the left proximal thigh identified as ossifying fasciitis, a lesion that must be considered in the differential diagnosis of soft tissue tumors.