obsolete_Thyroid Gland Undifferentiated (Anaplastic) Carcinoma true undifferentiated carcinoma of thyroid gland NCIT:C3878 thyroid gland undifferentiated carcinoma EFO:1000595 HP:0011779 thyroid gland undifferentiated (anaplastic) carcinoma undifferentiated carcinoma of the thyroid A primary carcinoma of the thyroid gland composed of undifferentiated cells. The malignant cells demonstrate evidence of epithelial differentiation, either by immunohistochemistry or electron microscopic studies. Microscopically, in the majority of cases there is a mixture of spindle, epithelioid, and giant cells. The vast majority of the patients present with a rapidly enlarging neck mass. The clinical course is usually aggressive. pleomorphic thyroid gland carcinoma DOID:0080522 metaplastic thyroid gland carcinoma undifferentiated thyroid gland carcinoma MedDRA:10002240 anaplastic thyroid cancer 3.88.0 thyroid cancer, anaplastic anaplastic carcinoma of the thyroid gland undifferentiated carcinoma of thyroid anaplastic carcinoma of thyroid gland GARD:0000664 anaplastic thyroid carcinoma thyroid gland carcinosarcoma anaplastic carcinoma of thyroid UMLS:C0238461 Dedifferentiated thyroid gland carcinoma Orphanet:142 MESH:D065646 THAP undifferentiated thyroid carcinoma sarcomatoid thyroid gland carcinoma undifferentiated carcinoma of the thyroid gland http://purl.obolibrary.org/obo/MONDO_0006468 anaplastic carcinoma of the thyroid undifferentiated thyroid tumor Replaced by Mondo term MONDO_0006468, with which this term was previously merged. Use: http://purl.obolibrary.org/obo/MONDO_0006468 ONCOTREE:THAP ICD10:C73 thyroid carcinoma, anaplastic undifferentiated (anaplastic) thyroid gland cancer undifferentiated (anaplastic) thyroid gland carcinoma anaplastic thyroid gland carcinoma SCTID:255031003