What is the most common histologic type of breast cancer?

Prepare for the NBME Form 10 Step 2 Test. Utilize flashcards and multiple choice questions, with hints and explanations for each. Ace your exam preparation!

Multiple Choice

What is the most common histologic type of breast cancer?

Explanation:
Invasive ductal carcinoma is the most common histologic type of breast cancer. It arises from the ductal epithelium and makes up the majority of invasive breast cancers (roughly 70–80%). Histology shows malignant cells that form duct-like structures and invade surrounding breast tissue. By comparison, invasive lobular carcinoma originates from the lobular units and often presents with multifocal or bilateral involvement; inflammatory breast cancer is a clinical presentation due to diffuse dermal lymphatic invasion; mucinous (colloid) carcinoma is a rarer subtype with abundant mucin and usually a better prognosis.

Invasive ductal carcinoma is the most common histologic type of breast cancer. It arises from the ductal epithelium and makes up the majority of invasive breast cancers (roughly 70–80%). Histology shows malignant cells that form duct-like structures and invade surrounding breast tissue.

By comparison, invasive lobular carcinoma originates from the lobular units and often presents with multifocal or bilateral involvement; inflammatory breast cancer is a clinical presentation due to diffuse dermal lymphatic invasion; mucinous (colloid) carcinoma is a rarer subtype with abundant mucin and usually a better prognosis.

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