Fusion of the caudal portions of the kidneys during
embryonic development is most likely to result in which of
the following congenital conditions?
A. Bicornuate uterus
B. Cryptorchidism
C. Horseshoe kidney
D. Hypospadias
E. Renal agenesis
Answer - C. During development, the kidneys typically “ascend”
from a position in the pelvis to a position high on the
posterior abdominal wall. Although the kidneys are bilateral
structures, occasionally the inferior poles of the two kidneys
fuse. When this happens, the “ascent” of the fused kidneys
is arrested by the first midline structure they encounter, the
inferior mesenteric artery. The incidence of horseshoe
kidney is about 0.25% of the population.
embryonic development is most likely to result in which of
the following congenital conditions?
A. Bicornuate uterus
B. Cryptorchidism
C. Horseshoe kidney
D. Hypospadias
E. Renal agenesis
Answer - C. During development, the kidneys typically “ascend”
from a position in the pelvis to a position high on the
posterior abdominal wall. Although the kidneys are bilateral
structures, occasionally the inferior poles of the two kidneys
fuse. When this happens, the “ascent” of the fused kidneys
is arrested by the first midline structure they encounter, the
inferior mesenteric artery. The incidence of horseshoe
kidney is about 0.25% of the population.
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