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Figure 23a.   Diffuse large cell lymphoma in a 56-year-old man who presented with acute abdominal pain. Contrast-enhanced helical CT scans demonstrate retroperitoneal hemorrhage displacing the left kidney anteriorly. Interruption of the enhancing cortical rim (arrow in b) suggests an underlying renal mass as the cause of bleeding. These findings are typical in renal cell carcinoma but very unusual in lymphoma.