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Radiology, Vol 131, 69-71, Copyright © 1979 by Radiological Society of North America

ARTICLES

The "ring sign" of necrotic pheochromocytoma

G Velasquez, PH Nath, C Zollikofer, O Valdez-Davila, WR Castaneda-Zuniga, A Formanek and K Amplatz

Pheochromocytomas are usually hypervascular tumors exhibiting dense stain during angiography. The cystic nature of the neoplasm or tumor necrosis can result in failure of opacification of the mass or a central lucent area. Four cases of pheochromocytoma are described where a central avascular zone was surrounded by a dense rim of contrast, giving a "ring sign." Since this appearance is best seen in the capillary and venous phases, delayed films are essential.




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