Alveolar soft part sarcoma of the pectoralis mimicking a breast mass: A case report

Abstract

Alveolar soft part sarcoma (ASPS) is a potentially lethal soft tissue tumor with a xropensity for distant metastasis. We report an exceedingly rare case of an ASPS arising from the pectoralis major in a young woman, with initial clinical findings mimicking a breast mass. We present the radiographic, immunohistochemical, and molecular workup leading to the correct diagnosis, with review of the differential diagnosis.

Keywords

• Breast
• Alveolar soft part sarcoma
• Next-generation sequencing
• Radiology-pathology correlation