title: Metastatic tumor of unknown origin.
mesh_terms: D000230:Adenocarcinoma / Q000556:secondary* / Q000648:ultrastructure; D006801:Humans; D002479:Inclusion Bodies / Q000648:ultrastructure; D007801:Langerhans Cells / Q000648:ultrastructure; D008175:Lung Neoplasms / Q000648:ultrastructure; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D013120:Spinal Cord Neoplasms / Q000556:secondary* / Q000648:ultrastructure