Convoluted secretory material in thyroid follicular epithelial tumors.
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.
D000230:Adenocarcinoma / Q000648:ultrastructure*; D001859:Bone Neoplasms / Q000556:secondary; D006801:Humans; D008297:Male; D008875:Middle Aged; D013964:Thyroid Neoplasms / Q000648:ultrastructure*