Abstract
A case of paroxysmal nocturnal hemoglobinuria (PNH) is presented in which MR imaging and CT findings were characteristic. The signal intensity of renal cortex was lower than that of medulla on both T1- and T2-weighted imaging. On CT without contrast enhancement the attenuation of renal cortex was higher than that of renal medulla. These findings at MR imaging and CT were the results of a deposition of hemosiderin in the cells of proximal convoluted tubules, and were helpful for diagnosis of PNH.
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