机体平衡-11、内分泌系统疾病录像_20121203.pptVIP

Clinical symptom * Results Malignant change * Caption: Thyroid gland. Illustration showing the thyroid gland (pink), seen surrounding the trachea (windpipe; coloured mauve). The blue vessels are veins; the red vessels are arteries. The thyroid gland is located in the neck on the trachea, with the larynx (voicebox) above it. The thyroid is a two-lobed gland, with the two lobes joined by an isthmus of tissue. An important endocrine gland, the thyroid secretes the hormones thyroxine and calcitonin into the blood. These hormones regulate energy levels and body metabolism, including mental and physical development. Lack of thyroid hormone may give rise to cretinism in infants and myxoedema in adults. * 2003-09-22 07:45　 * Benigh tumor derived from thyroid follicular epithelium Grossly Solitary, spherical nodule with intact capsule 3 ~ 5 cm in diameter The nodule may compress adjacent thyroid tissue * Figure 20-11 Follicular adenoma of the thyroid. A solitary, well-circumscribed nodule is seen Here is a surgical excision of a small mass from the thyroid gland that has been cut in half. The mass is well-circumscribed. Grossly it felt firm. By scintigraphic scan it was cold. This is a follicular adenoma. * Pathologic changes * Pathologic changes Microscopy Tumor cells are small and closely packed to form cords or trabeculae, while follicles are seldom formed. Tumor tissue resembles fetal thyroid tissue. Tumor lesion is mainly composed of small and uniform-appearing follicles with a tiny amount of colloid. Follicular cells are cuboidal. * Pathologic changes Tumor mainly consists of follicles. The size and colloid content of follicles are similar to those of normal thyroid follicles. Tumor mainly consists of large, colloid-rich follicles lined by flattened epithelial cells. Follicles may be not the same in size, sometimes merge into cystides. * Pathologic changes Tumor mainly consists of follicles. The size and colloid content of follicles are similar to tho