184.THYROID TUMOR SECRETING ACTH CAUSING CUSHING SYNDROME

A.ANAPALSTIC
B.PAPILLARY
C.MEDULLARY
D.FOLLICULAR

ANS:MEDULLARY

Ectopic ACTH Syndrome

Some benign or, more often, cancerous tumors that arise outside the pituitary can produce ACTH. This condition is known as ectopic ACTH syndrome. Lung tumors cause more than half of these cases, and men are affected three times more often than women. The most common forms of ACTH-producing tumors are small cell lung cancer, which accounts for about 13 percent of all lung cancer cases, and carcinoid tumors-small, slow-growing tumors that arise from hormone-producing cells in various parts of the body. Other less common types of tumors that can produce ACTH are thymomas, pancreatic islet cell tumors, and medullary carcinomas of the thyroid.