# A Rapidly Progressing Lower Extremity Soft Tissue Sarcoma in an Adolescent Patient

## TL;DR

A rare and fast-growing soft tissue sarcoma in an adolescent girl was initially mistaken for a muscle strain, highlighting the need for early suspicion of cancer in such cases.

## Contribution

The paper presents a rare case of rapidly progressive lower extremity sarcoma in an adolescent, emphasizing the importance of early diagnosis.

## Key findings

- The patient's symptoms worsened over three months with a rapidly enlarging calf mass.
- The case resulted in widespread metastatic disease due to delayed diagnosis.
- Timely referral to a specialized sarcoma center is crucial for proper evaluation and treatment.

## Abstract

Soft tissue sarcomas (STSs) are rare malignant tumors of mesenchymal origin with heterogeneous histologic subtypes and variable clinical behavior. Although STSs most commonly arise in the extremities, rapidly progressive sarcomas involving the distal lower extremity in adolescents have not been well documented. We report a case of an STS in a previously healthy adolescent female whose initial presentation was presumed to be a muscle strain. Over a three-month period, her symptoms worsened with progressive enlargement of a calf mass and development of widespread metastatic disease. This case highlights the importance of maintaining suspicion for malignancy in rapidly enlarging soft tissue masses, with timely referral to specialized sarcoma centers for further evaluation.