ABPath Anatomic Pathology Practice Questions - American Board Of Pathology Anatomic Pathology Primary Certification Examination Exam

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A 58-year-old woman has a 1.4 cm breast mass. Core biopsy shows invasive carcinoma with tumor cells in single-file and targetoid patterns. E-cadherin immunostain is negative. Which diagnosis is most likely?

Invasive ductal carcinoma, NST Invasive lobular carcinoma Tubular carcinoma Medullary carcinoma

Correct Answer:

Invasive lobular carcinoma

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