# Subcutaneous Angiofibroma of the Ankle: A Rare, Undescribed Clinical Entity

## TL;DR

A rare case of subcutaneous angiofibroma in the ankle is reported, highlighting its unique characteristics and importance in distinguishing it from other tumors.

## Contribution

This paper presents a new clinical case of subcutaneous angiofibroma, contributing to the limited understanding of this rare tumor type.

## Key findings

- The tumor exhibited alternating collagenous and myxoid lobules with a distinct vascular network.
- Histopathological features included uniformly arranged spindle cells with specific cytoplasmic and nuclear characteristics.
- The case underscores the importance of recognizing this tumor to avoid misdiagnosis as sarcoma or other soft tissue tumors.

## Abstract

Soft tissue angiofibroma is a pathology consisting of a benign fibrous vascularized tumor that mimics low-grade sarcoma. Such tumors frequently arise in the extremities, more commonly in the lower extremities, presenting as a slow-growing, painless swelling. Females are more commonly affected than males. We present the case of a 42-year-old male with a slow-growing, painless mass on the extensor aspect of his left foot. Differential diagnoses considered were soft tissue fibrosarcoma, liposarcoma, and sebaceous cysts. Surgical excision of the tumor was done, and upon histopathology, there were multiple lobules with well-circumscribed, alternating areas of collagenous and myxoid tissues. There was a prominent small vascular network with uniformly arranged spindle cells consisting of pale eosinophil-rich cytoplasm and small ovoid nuclei, fine chromatin, and an indistinct nucleolus. There are not many reported cases of this clinical entity, and every new case reported brings light to the pathology and progression of this tumor. Understanding this pathology is necessary since it mimics many other skin and soft tissue tumors.