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Fig. 13A —64-year-old woman with retroperitoneal paraganglioma. Unenhanced (A) and enhanced (B) CT scans show 4.5-cm mass (arrow) with heterogeneous enhancement in left paraaortic area. Note large cystic component with fluid-fluid level (arrowhead) within tumor mass. High attenuation of dependent fluid in cystic portion is suggestive of intratumoral hemorrhage.