1 June 2021
Image Quiz of the Week #57
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A 55 year old woman had a lower left lobectomy showing a well circumscribed flesh colored tumor. Histologic details are shown in the image below. Regarding this entity, which of the following statements is true?
Select an answer:
A. CDX2 is usually negative in the lung and is useful to differentiate from a metastasis of an intestinal origin
B. Ki67 proliferative index is essential to grade this tumor
C. Rb expression is typically lost in this tumor
D. TTF1 is always positive
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