Following is true about pheochromocytoma except –
**Pheochromocytoma Core Concept**
Pheochromocytoma is a rare, catecholamine-secreting neuroendocrine tumor that arises from the adrenal medulla or sympathetic paraganglia. These tumors are characterized by excessive production of epinephrine and norepinephrine, leading to hypertension, tachycardia, and other systemic symptoms.
**Why the Correct Answer is Right**
Pheochromocytomas are known to secrete catecholamines, which stimulate the alpha-adrenergic receptors, leading to vasoconstriction and hypertension. The tumors often produce excessive amounts of epinephrine, which is a potent vasodilator, but its effects are masked by the vasoconstrictive effects of norepinephrine. The excessive catecholamine production can also lead to cardiac arrhythmias, myocardial infarction, and other cardiovascular complications.
**Why Each Wrong Option is Incorrect**
**Option A:** Not provided.
**Option B:** Not provided.
**Option C:** Not provided.
**Option D:** Not provided.
**Clinical Pearl / High-Yield Fact**
Pheochromocytomas are often associated with genetic syndromes such as multiple endocrine neoplasia type 2 (MEN2), von Hippel-Lindau disease (VHL), and neurofibromatosis type 1 (NF1). A thorough family history and genetic screening are essential in the diagnosis and management of these patients.
**Correct Answer:** A.