NEOPLASMS OF THE THYROID

NEOPLASMS OF THE THYROID

Classification of thyroid neoplasms is presented in Table 55.6 and the relative incidence of malignancies in Table 55.7 . - - -

TABLE 55.6 Classi /f_i cation of thyroid neoplasms. Benign Follicular adenoma Malignant Primary Follicular epithelium – Follicular differentiated Papillary Follicular epithelium – Anaplastic poorly differentiated Parafollicular cells Medullar Lymphoid cells Secondary Metastatic Local in /f_i ltration TABLE 55.7 Relative incidence of primary malignant tumours of the thyroid gland. Malignancy Relative incidence (%) Papillary carcinoma 80 Follicular carcinoma 10 Poorly differentiated/anaplastic 5 carcinoma Medullary carcinoma 2.5 Lymphoma 2.5

NEOPLASMS OF THE THYROID

Classification of thyroid neoplasms is presented in Table 55.6 and the relative incidence of malignancies in Table 55.7 . - - -

TABLE 55.6 Classi /f_i cation of thyroid neoplasms. Benign Follicular adenoma Malignant Primary Follicular epithelium – Follicular differentiated Papillary Follicular epithelium – Anaplastic poorly differentiated Parafollicular cells Medullar Lymphoid cells Secondary Metastatic Local in /f_i ltration TABLE 55.7 Relative incidence of primary malignant tumours of the thyroid gland. Malignancy Relative incidence (%) Papillary carcinoma 80 Follicular carcinoma 10 Poorly differentiated/anaplastic 5 carcinoma Medullary carcinoma 2.5 Lymphoma 2.5