An autopsy case of horseshoe kidney.

Among various organ malformations of man, those in the urinary system appear rather frequently, and the fused kidney, mostly appearing as the horseshoe kidney with the fusion of the lower pole, is common. The fused kidney appears in 1 of 400 subjects, twice as frequently in males as in females (Warkany, 19719. According to the reports on Japanese so far, the incidence ranges between 0.22 and 0.28 % (Taira et al., 19519, with a male to female difference similar to that seen in Europeans. We have observed a case of horseshoe kidney among the cadavers used for anatomical research in 1975 as reported below.