1. Pheochromocytoma in an Incidentally Discovered Asymptomatic Cystic Adrenal Mass 
Paul J. Klingler, MD, Thomas P. Fox, MD, David M. Menke, MD, John M. Knudsen, MD, Jack T. Fulmer, MD 
Mayo Clinic Proceedings 
Volume 75, Issue 5, Pages (May 2000)
DOI: /
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2. Fig. 1
T2-weighted 5-mm coronal magnetic resonance image at level of adrenal glands, demonstrating rounded 3.1-cm cystic lesion (arrow) involving left adrenal gland. Note fluid level within mass.
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3. Fig. 2
Computed tomogram of abdomen with 5-mm collimated image through adrenal glands after administration of contrast medium (Optiray 320), demonstrating round low-density left adrenal mass (3.1 cm) (arrow) with cortical contrast enhancement (“ring sign”). Fluid level indicates possible hemorrhage or necrosis.
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4. Fig. 3
Gross photograph of surgically resected cystic pheochromocytoma.
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5. Fig. 4
A, Cross section of cyst: fibrous wall (above) and pheochromocytoma (below) (hematoxylin-eosin stain; original magnification x40). B, Immunohistological appearance of pheochromocytoma (chromogranin stain [brown], original magnification × 400). C, Electron microscopy of pheochromocytoma demonstrated dense core granules and cytoplasm (arrows) (original magnification 170,000).
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6. Fig. 5
Diagnostic and therapeutic management of asymptomatic patients or those with nonspecific symptoms and an adrenal mass. CT = computed tomographic; DST = dexamethasone suppression test; FNA = fine-needle aspiration; PAC = plasma aldosterone concentration; PRA = plasma renin activity (from Young18 with permission).
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