disease has location large cell carcinoma undifferentiated carcinoma thyroid gland undifferentiated (anaplastic) carcinoma https://www.malacards.org/card/anaplastic_thyroid_carcinoma icd11.foundation:320540024 anaplastic thyroid cancer undifferentiated thyroid tumor anaplastic thyroid carcinoma undifferentiated (anaplastic) thyroid gland carcinoma undifferentiated (anaplastic) thyroid gland cancer anaplastic carcinoma of thyroid thyroid gland undifferentiated (anaplastic) carcinoma undifferentiated carcinoma of the thyroid gland Dedifferentiated thyroid gland carcinoma Orphanet:142 EFO:1000595 sarcomatoid thyroid gland carcinoma ONCOTREE:THAP THAP UMLS:C0238461 MEDGEN:116064 DOID:0080522 pleomorphic thyroid gland carcinoma metaplastic thyroid gland carcinoma undifferentiated thyroid tumour anaplastic carcinoma of thyroid gland SCTID:255031003 undifferentiated carcinoma of thyroid anaplastic thyroid gland carcinoma anaplastic carcinoma of the thyroid undifferentiated thyroid gland carcinoma GARD:0000664 thyroid gland undifferentiated carcinoma 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. NCIT:C3878 MESH:D065646 undifferentiated carcinoma of thyroid gland thyroid carcinoma, anaplastic undifferentiated carcinoma of the thyroid thyroid cancer, anaplastic HP:0011779 anaplastic carcinoma of the thyroid gland MONDO:0006468 undifferentiated thyroid carcinoma thyroid gland carcinosarcoma MedDRA:10002240 thyroid gland carcinoma thyroid gland