Malignant phyllodes tumor of the left atrium

Area of Science:

• Cardiology
• Oncology
• Pathology

Background:

• Metastatic tumors to the heart are uncommon, typically affecting the right-sided cardiac chambers.
• Malignant phyllodes tumors of the breast are rare neoplasms with a potential for aggressive behavior.

Observation:

• A rare case of a malignant phyllodes tumor of the breast with metastatic involvement of the left atrium is presented.
• The metastasis occurred via direct invasion from mediastinal micro-metastases.

Findings:

• The metastatic tumor presented as a left atrial mass.
• This mass led to the development of cardiac arrhythmia.

Implications:

• This case expands the understanding of rare cardiac metastases from breast tumors.
• It underscores the importance of considering unusual metastatic routes and presentations in oncology and cardiology.