Parathyroid carcinoma or atypical parathyroid neoplasm can occur Multiple endocrine neoplasia type 1 (MEN1).
We present 2 cases of parathyroid carcinoma and 1 case of atypical parathyroid neoplasm in a cohort of 291 MEN1 patients.
The observed genetic mutations in the PC patients were c.703G > A (p.E235K) in exon 4 and c.1378C > T (p.R460X) in exon 10.
The malignancy potential of parathyroid tumors affects surgical planning for hyperparathyroidism treatment in MEN1 patients.