OBSOLETE: Sporadic pheochromocytoma

Sporadic pheochromocytoma (Orphanet code 276624) is an obsolete disease classification that was previously used to describe pheochromocytoma occurring without an identifiable hereditary cause. Pheochromocytoma is a rare catecholamine-secreting tumor arising from chromaffin cells of the adrenal medulla. The condition affects the endocrine and cardiovascular systems, causing episodic or sustained hypertension, headaches, excessive sweating, and rapid heartbeat (tachycardia) due to the overproduction of catecholamines such as epinephrine and norepinephrine. Patients may also experience anxiety, pallor, tremor, and weight loss. Hypertensive crises can be life-threatening if untreated. This Orphanet entry has been marked as OBSOLETE. Historically, pheochromocytomas were classified as sporadic when no germline mutation in known susceptibility genes was identified. However, advances in genetic testing have revealed that a significant proportion (up to 30-40%) of apparently sporadic pheochromocytomas actually harbor germline mutations in genes such as RET, VHL, SDHB, SDHD, SDHC, TMEM127, MAX, and others. As a result, the distinction between sporadic and hereditary pheochromocytoma has become less clinically meaningful, and current guidelines recommend genetic testing for all patients with pheochromocytoma regardless of family history. Treatment typically involves surgical resection of the tumor after appropriate preoperative alpha-adrenergic blockade to control blood pressure and prevent intraoperative hypertensive crises. Long-term follow-up is recommended due to the risk of recurrence or metastatic disease.

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