Atypical Parathyroid Tumor in an Ectopic Gland- Case Report

D'Addino Jose, Paredes Julieta, Grosso Cristina

Abstract: The atypical parathyroid tumor (formerly known as atypical parathyroid adenoma) is a novel entity introduced in the latest classification of parathyroid tumors (WHO 2022), representing a parathyroid neoplasm with uncertain malignant potential. It exhibits architectural features suspicious of malignancy but lacks unequivocal histomorphological findings of malignancy (invasion of adjacent tissues, angiolymphatic emboli, perineural invasion, and/or metastasis). We present a case of a double adenoma, with an ectopic gland whose histology revealed an atypical parathyroid tumor, and a multicentric thyroid carcinoma.

Keywords: Atypical parathyroid tumor, Primary hyperparathyroidism, Parathyroid adenoma