# Management of Malignant Psoas Syndrome From Breast Cancer: A Case Report

## TL;DR

This case report describes the first confirmed case of psoas muscle metastasis from breast cancer, highlighting the importance of early diagnosis for better patient outcomes.

## Contribution

The paper presents the first confirmed case of psoas muscle metastasis from breast cancer diagnosed via CT-guided biopsy.

## Key findings

- Psoas muscle metastasis was confirmed in a patient with recurrent breast cancer using CT-guided biopsy.
- Early recognition of psoas muscle metastasis is crucial for maintaining daily functional activities in patients.
- Breast cancer metastases to skeletal muscles, especially the psoas muscle, are rare and often under-recognized.

## Abstract

Malignant psoas syndrome (MPS) is a cancer-related pain syndrome caused by the metastasis or direct invasion of malignant tumors into the psoas muscle. Breast cancer metastases to skeletal muscles, particularly the psoas muscle, are extremely rare, leading to a limited awareness of MPS. Even suspected MPS is rarely reported in the literature. Here, we present the first confirmed case of psoas muscle metastasis in a patient undergoing treatment for recurrent breast cancer who was diagnosed with MPS using computed tomography-guided biopsy. Early recognition of psoas muscle metastasis is essential for improving patient outcomes, particularly in maintaining daily functional activities.