FINAL PATHOLOGIC DIAGNOSIS KEY HISTOLOGIC FEATURES
Thyroglossal duct cyst (TGDC) cancer
Presence of benign respiratory, cuboidal or squamous epithelial cyst lining in association with PTC and Lack of features of lymph node architecture and Lack of evidence of a primary PTC within thyroid parenchyma
Delphian node metastasis Histologic features of PTC with lymph node architecture, including lymphoid stroma and subcapsular sinus
Pyramidal lobe primary
PTC surrounded by a background of benign thyroid parenchyma Lack of features of lymph node architecture or TGDC features
Indeterminate origin Exact diagnosis based on above criteria could not be achieved.