Acardiac twin is a seldom malformation monocorionic pregnancies with prevalance of 1%. Acardiac twin usually occurs due to abnormal placental vascular anastomosis. This anomally is always lethal for recipient and has high mortality for pump twin. Pump twin is structurely normal but heart failure may develop with cardiomegaly, pericardial and ğleural effusion, ascites and polyhidramnios during pregnancy. The optimal management of acardiac twin is controversial. The aim of the surgery is to cut the blood flow to acardiac twin without harming the pump twin. We presented an acardiac ancephalic monocorionic twin case that is diagnosed at 16th weeks of pregnancy and succesful neonatal result with conservative approach. Conservative approaches may be better in the absence of poor prognostic factors.