Primary breast angiosarcoma: pathological and radiological diagnosis.

Area of Science:

• Oncology
• Pathology
• Radiology

Background:

• Primary breast angiosarcoma is an exceptionally rare and aggressive mesenchymal tumor, accounting for approximately 0.04% of all breast malignancies.
• This condition often presents with non-specific imaging findings, leading to potential misdiagnosis as benign breast lesions.

Purpose of the Study:

• To report a rare case of primary breast angiosarcoma in a young woman.
• To highlight diagnostic challenges, including varied histopathological patterns and the importance of immunohistochemical studies.
• To emphasize the necessity of whole-tumor examination for accurate grading.

Main Methods:

• Case report of a 22-year-old female with a breast mass.
• Initial ultrasonography followed by core needle biopsy and subsequent mastectomy.
• Histopathological examination and immunohistochemical (IHC) studies using CD31, CD34, and factor VIII-related antigens.

Main Results:

• Initial imaging suggested benign lesions like fibroadenoma or phyllodes tumor.
• Histopathology revealed a well-differentiated angiosarcoma (Grade I/III) initially, but the mastectomy specimen showed numerous neoplastic multinucleated giant cells.
• IHC confirmed high-grade, poorly differentiated angiosarcoma (Grade III/III), indicating heterogeneity within the tumor.

Conclusions:

• Angiosarcomas can exhibit variable differentiation patterns within the same tumor, complicating initial grading.
• Comprehensive histopathological evaluation of the entire tumor is crucial for accurate diagnosis and grading.
• Non-specific imaging findings necessitate a high index of suspicion for angiosarcoma, especially when lesions do not respond as expected.