**Question:** Which one of the following is false regarding primary adrenal hyperplasia?

A. Hyperplasia refers to an increase in cellular mass due to hormonal stimulation
B. Primary adrenal hyperplasia is characterized by a decrease in adrenal steroid production
C. Diagnosis is confirmed by measuring cortisol levels in the blood and urine
D. Treatment options include surgery and radiation therapy

**Correct Answer: D. Treatment options include surgery and radiation therapy**

**Core Concept:**
Primary adrenal hyperplasia is a condition characterized by an enlargement of the adrenal cortex due to hormonal stimulation, typically by adrenocorticotropic hormone (ACTH). This results in a compensatory increase in adrenal steroid production, particularly cortisol and aldosterone. In such cases, the adrenal glands become enlarged and produce more hormones than usual due to increased ACTH secretion from the pituitary gland.

**Why the Correct Answer is Right:**
The correct answer (D) highlights that surgery and radiation therapy are potential treatment options for primary adrenal hyperplasia. While these interventions may be considered in some cases, they are not the standard first-line treatments for this condition.

**Why Each Wrong Option is Incorrect:**

A. Hyperplasia refers to an increase in cellular mass due to hormonal stimulation: This is true and serves as a background information for the condition. However, it does not address the specific treatment options for primary adrenal hyperplasia.

B. Primary adrenal hyperplasia is characterized by a decrease in adrenal steroid production: This statement is incorrect because, as explained above, primary adrenal hyperplasia results in an increase in adrenal steroid production.

C. Diagnosis is confirmed by measuring cortisol levels in the blood and urine: Diagnosis of primary adrenal hyperplasia involves measuring cortisol levels in the blood, plasma, or serum, not urine. Blood cortisol levels are typically elevated in this condition.

**Clinical Pearl:**
Primary adrenal hyperplasia should be suspected in patients presenting with signs and symptoms of hypercortisolism, such as weight gain, redistribution of fat, moon face, hirsutism, and osteoporosis. Diagnosis is confirmed by measuring cortisol and ACTH levels in the blood and comparing them to normal ranges. Treatment options include medications to suppress ACTH secretion, such as ketoconazole, metyrapone, or mitotane, and surgery (adrenalectomy) in severe cases. These interventions are aimed at reducing cortisol production or blocking its action.