# Synchronous Primary Malignancies: Incidental Detection of Ascending Colon Adenocarcinoma During Staging of Invasive Ductal Carcinoma of the Breast

## TL;DR

A 73-year-old woman was diagnosed with both breast and colon cancer at the same time, requiring coordinated treatment strategies for optimal outcomes.

## Contribution

This case highlights the management challenges and importance of multidisciplinary collaboration in treating synchronous breast and colon cancers.

## Key findings

- Synchronous breast and colon cancers are rare and require complex diagnostic and treatment planning.
- Multidisciplinary team collaboration is essential for personalized treatment and improved outcomes in such cases.

## Abstract

Multiple primary malignant neoplasms (MPMNs) are defined as two or more distinct tumors in the same individual. Synchronous breast and colon cancers are infrequent and present management challenges due to the lack of standardized guidelines. We report a 73-year-old woman presenting with a right breast mass, subsequently diagnosed as Grade 2 invasive ductal carcinoma. Staging CT incidentally revealed right colon wall thickening, and colonoscopy with biopsy confirmed moderately differentiated invasive adenocarcinoma. Following neoadjuvant chemotherapy, she underwent simultaneous radical mastectomy with axillary lymph node dissection and right hemicolectomy. Postoperative recovery was uneventful. Adjuvant chemoradiation was administered per multidisciplinary team (MDT) recommendation. Synchronous breast and colon cancers pose unique diagnostic and treatment planning challenges. MDT collaboration is crucial for personalized treatment strategies and optimized outcomes in these complex cases.