**Core Concept**
Catecholamine excess, as seen in pheochromocytoma, leads to sustained hypertension and autonomic symptoms due to excessive release of epinephrine and norepinephrine. This condition is a paraneoplastic syndrome involving a tumor of the adrenal medulla, and its systemic effects include cardiovascular complications due to chronic vasoconstriction and myocardial stress.

**Why the Correct Answer is Right**
In pheochromocytoma, chronic exposure to high levels of catecholamines causes direct myocardial toxicity, leading to focal myocardial necrosis. This is due to catecholamine-induced coronary vasospasm, increased myocardial oxygen demand, and arrhythmias, which can result in ischemic injury. Focal necrosis is a hallmark of severe, prolonged catecholamine excess and is more common in large or aggressive tumors. It is a key cardiovascular manifestation in systemic disease due to pheochromocytoma.

**Why Each Wrong Option is Incorrect**
Option B: Proximal aortitis is not a typical feature of pheochromocytoma. Aortic inflammation is more commonly associated with conditions like vasculitis or Kawasaki disease, not catecholamine excess.
Option C: Endothelial plaques are characteristic of atherosclerosis, which develops over time with hypertension but are not a direct or typical feature of acute catecholamine toxicity.
Option D: Systolic scratchy sound (typically referring to a systolic murmur) is not a classic or specific finding in pheochromocytoma and may be due to other cardiac conditions.

**Clinical Pearl / High-Yield Fact**
Pheochromocytoma is a rare but life-threatening cause of secondary hypertension with episodic symptoms. A key red flag is the presence of severe, paroxysmal hypertension with headache, palpitations, and anxiety—prompting urgent testing for catecholamines and imaging to detect adrenal tumors.

✓ Correct Answer: A. focal myocardial necrosis