Thyroid oncocytomas can be benign (adenomas) or malignant (carcinomas). Functional adrenocortical adenomas are surgically curable. Brown tumors may be rarely associated with ectopic parathyroid adenomas or end stage renal osteodystrophy. Hepatoblastoma, adenomas and hepatocellular carcinomas can also lead to EMH in adults. It has been shown to cause liver, kidney, and thyroid adenomas and carcinomas in rats. Examples include thyroid adenomas and adrenocortical adenomas. Less commonly it may be due to double parathyroid adenomas or parathyroid hyperplasia. These tests are based on the glucocorticoid sensitivity of pituitary adenomas compared to non-pituitary tumors. These adenomas are on the anterior pituitary gland. Hormone secreting pituitary adenomas cause one of several forms of hyperpituitarism. Chief cells in parathyroid adenomas also display acid phosphatase activity. Various types of headaches are common in patients with pituitary adenomas. Non-cancerous cases include simple cysts, colloid nodules, and thyroid adenomas. Almost all thyroid adenomas are follicular adenomas. Approximately 60 percent of parathyroid adenomas may be imaged by sestamibi scanning.