Is acromelagy always due a pituitary tumor?

Other rare causes: Growth hormone (GH) producing pituitary tumor is the primary cause for acromegaly. Other reported cases are rare, including: GH-releasing hormone producing hypothalamic tumor (an area above the pituitary) and ectopic GH production by neuroendocrine tumor or small cell lung cancer. Excess GH is also rarely secreted by certain lymphoma.

No: Diagnosing acromegaly involves 2 blood tests that measure level of insulin-like growth factor-1 (IGF-1) and oral glucose tolerance t\ (OGTT). Difficult to test level of growth hormone (GH) in acromegaly. Scan of head performed to confirm presence an adenoma in pituitary gland. If no tumor detected, a CT scan of abdomen and pelvis looks for tumors of adrenal, pancreas or pvary producing GH