M 56
A round nodular density in RLL
Underlying pulmonary fibrosis (UIP)
A cellular tumor and underlying irregular fibrosis
Lymphangitic spread
Lymphangitic spread
Lymphatic tumor emboli
Pleural penetration
CD 56 TTF-1 C-Kit
Histologically poorly differentiated carcinoma, large cell, with neuroendocrine differentiation
Diagnosis: Poorly differentiated large cell neuroendocrine carcinoma in usual interstitial pneumonia