An elderly man had a lung nodule resected due to concern for malignancy. Below are sections of the formalin-fixed paraffin embedded tissue. Identification?
Hematoxylin and eosin (H&E), 2x objective
H&E, 10x objective
A careful search revealed only the following single structure ( H&E, 100x objective)
Gomori methenamine silver (GMS) stain highlighted parts of this nodule