# Breast Cancer Metastasis Developed Inside an Angiomatous Meningioma: A Case Report

## TL;DR

This paper reports a rare case of breast cancer metastasis occurring inside a meningioma, highlighting the importance of histopathological analysis for diagnosis.

## Contribution

The paper presents a rare clinical case of breast cancer metastasis within a meningioma, adding to the limited literature on tumor-to-meningioma metastasis.

## Key findings

- Breast cancer metastasis inside a meningioma is a rare phenomenon known as tumor-to-tumor metastasis.
- Histopathological analysis is crucial for diagnosing such rare metastatic cases.
- The pathophysiology of this metastatic phenomenon remains unclear despite hormonal theories.

## Abstract

The intracranial development of breast metastasis inside a meningioma is a rare entity known as tumor-to-tumor metastasis or tumor-to-meningioma metastasis. Although rare such cases have been reported in the scientific literature, most of them are from breast and lung cancer, and even rarer from the genitourinary tract, while meningioma is the most cited to harbor these metastases. A thorough histopathological analysis represents the cornerstone of the diagnosis of these lesions. The current article presents a case of breast cancer metastasis developed inside a meningioma in a female patient, which is a rare metastatic presentation. Although hormonal causes have been incriminated, the pathophysiology of this phenomenon is still unclear.