Primary squamous cell carcinoma, breast: A challenging diagnosis

Area of Science:

• Oncology
• Pathology

Background:

• Primary squamous cell carcinoma of the breast is an extremely rare malignancy, accounting for less than 0.1% of all breast cancers.
• This aggressive, triple-hormone negative tumor presents diagnostic challenges in histopathology and radiology.
• The exact pathogenesis remains unclear, with various theories proposed for its origin.

Observation:

• A 54-year-old female presented with a painless, progressively growing right breast lump over three months.
• Clinical examination revealed a well-defined, firm, non-tender swelling in the upper inner quadrant.
• Initial core needle biopsy raised suspicion of malignancy, with repeat biopsy diagnosing metaplastic carcinoma with squamous differentiation.

Findings:

• Final resection confirmed primary squamous cell carcinoma of the breast with no nodal metastasis.
• Metastatic causes were meticulously ruled out through comprehensive clinical, radiological, and histopathological correlation.
• The tumor exhibited squamous differentiation, a rare finding in primary breast malignancies.

Implications:

• Primary squamous cell carcinoma of the breast requires careful exclusion of metastatic disease due to its rarity and aggressive nature.
• The tumor's relative resistance to conventional chemotherapy and unpredictable prognosis necessitate further investigation.
• Additional research is crucial for establishing optimal management protocols and understanding the long-term prognosis of this rare breast cancer subtype.