title: Limitations of the usefulness of microvillous ultrastructure in distinguishing between carcinoma primary in and metastatic to the lung.
mesh_terms: D000230:Adenocarcinoma / Q000556:secondary* / Q000648:ultrastructure*; D003937:Diagnosis, Differential; D006801:Humans; D008175:Lung Neoplasms / Q000556:secondary* / Q000648:ultrastructure*; D008871:Microvilli / Q000648:ultrastructure