Fig. 2

(a, b) Tumor nodule showed a typical pulmonary sclerosing pneumocytoma of hemorrhage growth pattern comprising of large blood-filled spaces lined by surface cells (h&e). (c, d) Cuboidal surface cell were positive for pancytokeratin (CKpan), round cells were negative for CKpan. (e, f) Cuboidal surface cell were positive for Napsin A, round cells were negative. (g, h) Both cuboidal surface and stromal round cells were positive for thyroid transcription factor-1 (TTF-1). (i, j) Both cuboidal surface and stromal round cells were positive for epithelial membrane antigen (EMA)