A 5 year old Montofon cow, pregnant to its second calf was brought from the Research and Practise Farm of Veterinary Faculty of Istanbul University to the clinics of Veterinary Faculty and preliminary diagnosis was made as mummification. During the cesarean operation 5-6 months old mummified twin fetuses were found. Operation was ended by making the appropriate applications and postoperative care and therapy was applied. Regular health checks of the cows during periods of pregnancy were found to be important.