# Malignant Phyllodes Tumor With Chondroblastic Osteosarcomatous Differentiation: A Case Report

## TL;DR

This case report describes a rare malignant breast tumor with chondroblastic osteosarcomatous features, highlighting its diagnostic challenges and poor prognosis.

## Contribution

The paper contributes a new case report of a rare MPT subtype with chondroblastic osteosarcomatous differentiation, expanding limited existing literature.

## Key findings

- Malignant phyllodes tumors with chondroblastic osteosarcomatous differentiation are rare and poorly characterized.
- Morphological analysis remains critical for diagnosis due to the lack of a defined staining profile.
- Reported cases suggest a poor prognosis for this tumor subtype.

## Abstract

Malignant phyllodes tumors (MPTs) represent the most pernicious type of intralobular stromal proliferation known as a “fibroepithelial lesion” (FEL). They comprise a small fraction of breast malignancies and can present as either a pure MPT or sometimes include a heterologous component (liposarcoma, chondrosarcoma, osteosarcoma, or rhabdomyosarcoma). Of the fraction of MPTs that include heterologous components, very little about those with chondroblastic osteosarcomatous differentiation has been described in the literature. As such, a characteristic staining profile has yet to be established, even though morphological analysis is the cornerstone of diagnosis. The few reported cases have described a poor prognosis. Therefore, we present a case of MPT with chondroblastic osteosarcomatous differentiation to contribute to the dearth of literature examining this entity.