[Conservative management of deformed twin pregnancy].

A twin reversed arterial perfusion (TRAP) sequence was diagnosed in a monochoriotic, diamniotic twin pregnancy at GA 12 weeks + 2 days. According to the parents' wish the pregnancy was managed conservatively with close monitoring, with ultrasound biometry and Doppler flow measurements in the umbilical artery, middle cerebral artery and ductus venosus. At GA 34 weeks + 0 days the TRAP twin was growing rapidly and the amnion fluid index was increasing rapidly. An uncomplicated elective section was performed. The acardiac/pump twin weight ratio was 134%. The pump twin was without sequelae.