Fig. 6: Metastatic lung adenocarcinoma to the breast.
From: Novel uses of immunohistochemistry in breast pathology: interpretation and pitfalls
Lung adenocarcinoma with well-formed glands, cribriform architecture, and desmoplasia (A, B) mimics breast carcinoma. Lung adenocarcinomas can be identified by labeling for nuclear TTF-1 (C) and cytoplasmic Napsin A (D); but, they can also label for nuclear GATA3 (E) and ER (F), which is a pitfall for breast carcinoma.
