label: Twin Reversed Arterial Perfusion Sequence Malformation
label_lc: twin reversed arterial perfusion sequence malformation
description: "A severe form of twin-twin transfusion syndrome that occurs in monochorionic pregnancies. The normal twin (pump twin) supplies the blood flow to its sibling that lacks heart or brain or both (acardiac/acephalic twin). Untreated, it may lead to the demise of the pump twin in some cases."