The gross specimen shown above, obtained from a mastectomy, demonstrates a large, ill-defined, firm, whitish-tan mass with an infiltrative border. These features are most consistent with which of the following diagnoses?
A. Medullary carcinoma
B. Phyllodes tumor
C. Invasive ductal carcinoma, no special type
D. Fibroadenoma
Explanation
Image Findings
Large, ill-defined, irregular mass within the breast tissue.
Whitish-tan to greyish-white cut surface of the mass.
Firm, gritty texture (implied by the appearance of the cut surface).
Infiltrative or stellate borders, extending into the surrounding adipose tissue, lacking a clear capsule.
Distortion of normal breast architecture.
Diagnosis
Key Point
The gross appearance of a large, ill-defined, firm, whitish-tan mass with infiltrative borders is classic for Invasive Ductal Carcinoma, No Special Type (NST).
This specimen, likely from a mastectomy for locally advanced breast carcinoma, shows a dominant, irregular, and infiltrative mass. The whitish-tan color and firm, gritty texture (as suggested by the cut surface) are due to the extensive desmoplastic reaction induced by the tumor cells. The ill-defined, stellate margins indicate its invasive nature, distinguishing it from benign or well-circumscribed malignant lesions.
Well-circumscribed, soft, fleshy, often hemorrhagic/necrotic
Large, well-circumscribed, leaf-like clefts, cystic areas
Margins
Infiltrative, stellate
Pushing, encapsulated
Pushing, often pseudo-encapsulated
Pushing, often with cystic degeneration
Consistency
Firm to hard
Rubbery
Soft, fleshy
Variable, often firm with soft areas
Clinical Relevance
Clinical Pearl
Invasive Ductal Carcinoma (NST) is the most common type of breast cancer, accounting for 70-80% of all invasive cases. Its infiltrative nature often leads to a palpable hard lump and can cause skin dimpling or nipple retraction.
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The desmoplastic reaction (stromal fibrosis) is a hallmark of Invasive Ductal Carcinoma (NST), contributing to its firm consistency and stellate appearance on imaging and gross examination.
Key Point
Locally advanced breast carcinoma refers to tumors that are large (T3/T4), involve regional lymph nodes (N2/N3), or have direct extension to chest wall/skin, but without distant metastases.
Common Traps
Warning
Do not confuse the infiltrative margins of IDC with the well-circumscribed, pushing margins of benign lesions like fibroadenomas or even some specific types of carcinomas like medullary carcinoma, which can be a common distractor in image-based questions.
Reference
Robbins Basic Pathology, 10th Ed, Ch 24
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