Atypical Parathyroid Gland Tumor

**Semantic type:** Neoplastic Process

**Definition:** A parathyroid gland tumor that shares certain morphologic characteristics with parathyroid gland carcinomas (e.g. broad fibrous bands formation with or without hemosiderin deposition, presence of mitotic figures) but lacks unequivocal evidence of capsular or vascular invasion. It is considered a tumor of uncertain malignant potential. (WHO)

**Synonyms:** - APT - Atypical Parathyroid Gland Adenoma - Atypical Parathyroid Gland Neoplasm - Atypical Parathyroid Neoplasm - Atypical Parathyroid Tumor - Parathyroid Gland Atypical Adenoma - Parathyroid Gland Tumor of Low/Uncertain Malignant Potential - Parathyroid Tumor of Low/Uncertain Malignant Potential