Fig. 3
From: Benign clear cell “sugar” tumor of the lung in a patient with Birt-Hogg-Dubé syndrome: a case report
Pathologic findings of a pulmonary nodule in the left lower lobe. The nodule consisted of polygonal tumor cells with pleomorphic nuclei and clear cytoplasm (a, H&E). The PAS stain was intensively positive in cytoplasm of tumor cells (b). Immunohistochemistry revealed that nuclei of the tumor cells were diffusely positive for microphthalmia transcription factor (c), and their membrane was weakly positive for CD1a (d), strongly positive for CD10 (e), and focally positive for folliculin (f)