[Megacystis-microcolon intestinal hypoperistalsis syndrome (MMIHS) as a rare differential diagnosis of foetal megacystis on ultrasonography].

INTRODUCTION: Foetal megacystis (incidence 1:1 500) occurring in the first trimester may already be a sign of congenital malformation. Often, urethral valves are causally responsible in male foetuses far more frequently than urethral atresia. As a further differential diagnosis, the "prune-belly syndrome" needs to be distinguished. Far more difficult to classify prenatally is the rare MMIHS which, in contrast to the diagnosis of urethral valves, is associated with an unfavourable prognosis. CASE REPORT: This is a report on a 28-year-old IG/0P, whose foetus of 26+4 gestational weeks was found on ultrasonography for the first time to have a megacystis of 48 mm diameter and bilateral hydronephrosis. The female foetus was surrounded by a normal amount of amniotic fluid which, during the further course of the pregnancy, developed into polyhydramnios. The serial puncture of the urinary bladder showed a normal karyotype and no impairment of the renal concentrating capacity or of protein loss. By reason of an immense enlargement of the abdomen due to the 100 mm large urinary bladder, a Caesarean section was conducted at 36+0 gestational weeks. A catheter could be inserted into the urinary bladder postpartum easily. However, nourishment was not possible and after radiological examination, MMIHS was diagnosed.
CONCLUSION: In the case of a foetal megacystis detected by ultrasonography, especially associated with polyhydramnios and female gender, the rare MMIHS, which is infaust, should be taken into consideration. © Georg Thieme Verlag KG Stuttgart · New York.