title: Atypical thyroid carcinoma: atypical follicular or atypical medullary carcinoma?
abstract: The authors present a case of an atypical thyroid carcinoma with characteristics which, at light microscopy, are suggestive of a medullary carcinoma. However, ultrastructural study suggests an atypical follicular carcinoma. The differential diagnosis is discussed.
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis* / Q000648:ultrastructure; D002277:Carcinoma / Q000175:diagnosis* / Q000648:ultrastructure; D002467:Cell Nucleus / Q000648:ultrastructure; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D009940:Organoids / Q000648:ultrastructure; D013964:Thyroid Neoplasms / Q000175:diagnosis* / Q000648:ultrastructure