# Pseudoangiomatous Stromal Hyperplasia in the Breast: A Report of a Rare Case

## TL;DR

This paper reports a rare case of nodular Pseudoangiomatous Stromal Hyperplasia (PASH) in a young woman initially diagnosed with fibroadenoma.

## Contribution

The novelty lies in presenting a rare and underreported case of nodular PASH to improve understanding and diagnostic awareness.

## Key findings

- Nodular PASH can mimic fibroadenoma in clinical and radiological features.
- Histopathological analysis is essential to distinguish PASH from low-grade angiosarcoma.
- Patients with PASH have a favorable prognosis after surgical excision.

## Abstract

Pseudoangiomatous stromal hyperplasia (PASH) is a benign mesenchymal proliferative breast lesion. PASH seldom forms a nodule on its own, in the absence of other breast tumours, resulting in "nodular PASH." Given its rarity, we provide a fascinating case of this poorly understood breast pathology in a 25-year-old woman who was first diagnosed with fibroadenoma of the left breast. Breast ultrasonography and mammography are the most commonly used procedures for evaluating breast diseases. Fibroadenomas can have the same clinical and radiological presentation as nodular PASH. Because of the non-specific features of nodular PASH, histopathological testing remains the gold standard for confirming this unusual diagnosis and ruling out low-grade angiosarcoma. Patients with nodular PASH have a great prognosis following excision. PASH is a benign stromal growth that histologically induces a vascular lesion; additional instances must be reported in order to generate thorough guidelines for managing it.