Pheochromocytoma : Internal medicine video lectures for FMGE and NEET - PG

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Pheochromocytoma: Internal medicine video lectures for FMGE and NEET - PG

A pheochromocytoma is a catecholamine-secreting tumor that typically develops in the adrenal medulla. Pheochromocytomas are usually benign (∼ 90% of cases) but may also be malignant. Classic clinical features are due to excess sympathetic nervous system stimulation and involve episodic blood pressure crises with paroxysmal headaches, diaphoresis, heart palpitations, and pallor. However, pheochromocytomas may also be asymptomatic or manifest with persistent hypertension. Elevated catecholamine metabolites in the plasma or urine confirm the diagnosis, while imaging studies in patients with positive biochemistry are used to determine the location of the tumor. Surgical resection is the treatment of choice but is only carried out once alpha blockade with phenoxybenzamine has become effective.

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