Fig. 2

Histological and immunohistological findings. A-B H&E sections showed meningothelial-like nodules which are distinct from the neighboring normal lung architecture. C Higher magnification shows an interstitial proliferation of epithelioid and spindled cells with a vague whirling and streaming pattern. D The cells comprising the nodules showed diffuse cytoplasmic staining with EMA (E), strong nuclear PR expression (E) and diffuse membranous expression with pan-TRK (F). Original magnification: x100 (A-B), x200 (C-F).