title: Convoluted secretory material in thyroid follicular epithelial tumors.
abstract: Electron microscopy may occasionally be useful, when routine histopathologic methods fail, in the typing of tumors, including those that present as metastases from occult primary sites. We describe a case in which the presence of an uncommon ultrastructural feature aided in establishing the thyroid gland as the source of a skeletal metastatic tumor.
mesh_terms: D000230:Adenocarcinoma / Q000648:ultrastructure*; D001859:Bone Neoplasms / Q000556:secondary; D006801:Humans; D008297:Male; D008875:Middle Aged; D013964:Thyroid Neoplasms / Q000648:ultrastructure*