Pheochromocytoma: detection by unenhanced CT.

Area of Science:

• Radiology
• Endocrinology
• Oncology

Background:

• Pheochromocytoma diagnosis requires accurate imaging.
• Contrast-enhanced CT carries risks, including hypertensive crisis.

Purpose of the Study:

• To evaluate the efficacy of unenhanced computed tomography (CT) for diagnosing pheochromocytoma.
• To compare CT findings with iodine-131 metaiodobenzylguanidine (131I-MIBG) scintigraphy.

Main Methods:

• Retrospective analysis of 10 patients with suspected pheochromocytoma.
• Unenhanced CT scans of the adrenals and retroperitoneum.
• 131I-MIBG scintigraphy in nine patients.
• Follow-up serum catecholamine assays and surgical/pathologic confirmation where available.

Main Results:

• Unenhanced CT identified adrenal masses, hyperplasia, and extraadrenal masses in seven of 10 patients.
• CT findings were corroborated by 131I-MIBG scintigraphy in all evaluated cases.
• Normal CT and scintigraphy correlated with normal serum catecholamines.

Conclusions:

• Unenhanced CT is a reliable initial imaging modality for suspected pheochromocytoma.
• This approach minimizes the risk of hypertensive crisis associated with contrast agents.
• CT provides accurate localization of pheochromocytomas and related abnormalities.