A case of fetal abdominal cyst prenatally diagnosed with aspiration cytology.

We report a case of fetal abdominal cyst that was prenatally diagnosed using aspiration cytology. An abdominal cyst with a diameter of 6 cm was detected by ultrasonography in a 30-weekold female fetus in a twin pregnancy. Transitional cells were detected in a aspiration cytology specimen from the dilated ureter. The fetus was delivered at 34-weeks by Cesarean section, and she is presently alive, although she has some urogenital anomalies. Cytology is a useful method for prenatal diagnosis.