Brazil nuts contain high levels of minerals such as selenium, magnesium, copper, manganese, potassium, calcium, iron, phosphorus, and zinc. Magnesium is a key nutrient in a whole host of biological processes. Selenium is an important co-factor for the antioxidant enzyme glutathione-peroxidase.
Print All Open All Close All. A gastrointestinal stromal tumor (GIST) is a type of tumor that occurs in the gastrointestinal tract, most commonly in the stomach or small intestine. The tumors are thought to grow from specialized cells found in the gastrointestinal tract called interstitial cells of Cajal (ICCs) or precursors to these cells. GISTs are usually found in adults between ages 40 and 70; rarely, children and young adults develop these tumors.
Definition. Testicular sex cord stromal tumors include Leydig cell tumors, Sertoli cell tumors, and granulosa cell tumors. Leydig cell tumors (see the image below) are derived from normal Leydig cells that produce testosterone and are located in the interstitium of the testis.Leydig cell tumor.Note the clear cytoplasm.eydig cell tumor. Boys with Leydig cell sex cord stromal tumors present with endocrinologic symptoms (virilization, gynecomastia), while men present with a testicular mass; some (10-30%) have gynecomastia. In boys, Leydig cell tumors are benign. However, in men, 10-17% of these tumors are malignant.