These fetal kidneys (from a gestation estimated at 25 weeks in the second trimester) demonstrate a normal cut surface. Note the pelvis and calyces. Note the well-defined corticomedullary junctions.

• 这是妊娠中期，估计为25周胎儿肾。切面正常，可见肾盂、肾盏，皮质、髓质分界清楚。