Case 1004-- A Middle Aged Female with Left Lower Lobe Lung Mass

Swikrity Upadhyay Baskota, MBBS, MD and Liron Pantanowitz, MD


A woman in her mid-50s presented with a slowly growing left lower lobe lung mass that measured up to 1.5 cm by CT scan. CT-guided FNA smears and cell block preparation were performed. The microscopic images of Diff-Quik stained direct smears and an H&E stained cell block section are shown in figures 1, 2 and 3. What is your diagnosis?

Cytology Diagnosis: Atypical Epithelial Cells, Favor Adenocarcinoma.

Based on the cytology impression; a left lower lobe lobectomy was performed.

H&E and IHC (TTF-1) stained sections of the tumor are shown. What is your diagnosis?


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