All are true about acromegaly except :
**Core Concept**
Acromegaly is a hormonal disorder that results from excess growth hormone (GH) production, usually due to a pituitary gland tumor. This excess GH causes the body's tissues and organs to grow abnormally, leading to various physical and systemic complications.
**Why the Correct Answer is Right**
The correct answer is one of the options that does not accurately describe a characteristic of acromegaly. Acromegaly is indeed characterized by:
* Excess GH production, often due to a pituitary adenoma
* Insulin resistance and type 2 diabetes
* Joint pain and degenerative joint disease
* Cardiac complications, including hypertension and cardiomyopathy
* Skin changes, such as thickening and oiliness
* Headaches and visual disturbances due to the pituitary tumor's impact on surrounding structures
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because acromegaly is not caused by an excess of thyroid-stimulating hormone (TSH). TSH is a hormone produced by the pituitary gland that stimulates the thyroid gland to produce thyroid hormones. While thyroid hormone imbalances can affect GH production, they are not a direct cause of acromegaly.
**Option B:** This option is incorrect because acromegaly is not characterized by an increase in parathyroid hormone (PTH). PTH is a hormone produced by the parathyroid glands that regulates calcium levels in the blood. While patients with acromegaly may experience changes in bone density, PTH levels are not typically elevated in this condition.
**Option C:** This option is incorrect because acromegaly is not caused by an excess of antidiuretic hormone (ADH). ADH is a hormone produced by the hypothalamus that regulates water reabsorption in the kidneys. While patients with acromegaly may experience changes in fluid balance, ADH levels are not typically elevated in this condition.
**Option D:** This option is incorrect because acromegaly is not characterized by an increase in follicle-stimulating hormone (FSH). FSH is a hormone produced by the pituitary gland that regulates ovarian function in women and spermatogenesis in men. While patients with acromegaly may experience changes in reproductive function, FSH levels are not typically elevated in this condition.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of acromegaly is the "acro" part of the name, which refers to the abnormal growth of the hands and feet. Patients with acromegaly often experience thickening and enlargement of the skin, particularly on the hands and feet, leading to characteristic changes in shoe and glove size.
**Correct Answer: None**