Teratology
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A case of prune belly syndrome (PBS) in a 22 week male fetus is described. All the features characteristic of the syndrome were present: absence of abdominal muscle; dilatation of the bladder, ureters, and renal pelves; and undescended testes. In addition, there was marked ascites. ⋯ The prostate was thin-walled and its urethra greatly expanded. The testes lay close to the corresponding ureters and each ductus deferens was only partially present. It is considered that prostatic dysgenesis and fetal ascites are key factors in the causation of PBS.