An aggressive THYROID GLAND malignancy which generally occurs in IODINE-deficient areas in people with previous thyroid pathology such as GOITER. It is associated with CELL DEDIFFERENTIATION of THYROID CARCINOMA (e.g., FOLLICULAR THYROID CARCINOMA; PAPILLARY THYROID CANCER). Typical initial presentation is a rapidly growing neck mass which upon metastasis is associated with DYSPHAGIA; NECK PAIN; bone pain; DYSPNEA; and NEUROLOGIC DEFICITS.
Also Known As:
Thyroid Carcinoma, Anaplastic; Thyroid Cancer, Anaplastic; Anaplastic Thyroid Cancer; Anaplastic Thyroid Cancers; Anaplastic Thyroid Carcinomas; Cancer, Anaplastic Thyroid; Cancers, Anaplastic Thyroid; Carcinoma, Anaplastic Thyroid; Carcinomas, Anaplastic Thyroid; Thyroid Cancers, Anaplastic; Thyroid Carcinomas, Anaplastic