Maternal Tirotoxicosis is a pathology that supervene around two of every thousand pregnancy. It is associated with a slow increment of neonatal mortality rate and low weight neonate. There is mayor incidence of congenital malformation in mothers with not treaty Graves illness lineage.

This is a case of a 32 years old female, G:4 P:2 C:O A:1, with multiple pregnancy (triplets); and history of hyperthyroidism, that initiate with dyspnea. Physical examination present death rattle in both pulmonary bases; tachycardia; with II/VI systolic blow predominantly in aortic and accessory aortic focus; abdomen with good uterine tone; fetal movement and cardiac frequency were presents. In patient evolution, presents a restlessness status and respiratory distress with fetal movement decreased. Laboratory exams reveal, increase of thyroids hormones. Thorax radiography, evidence bi lateral parahiliar reinforcement with flow cephalization and cardiac silhouette of increased size. The pelvic USG present two, of three, dead products; with hairy skin edema and hydropics signs. Then, patient initiate birth labor and we attend vaginal multiple birth with cephalic extraction of first and second death products and breech presentation of third female product with 800g and 28 weeks approximately. We conclude that our case is a Maternal Tirotox icosis because all the clinic discovery and evolution are proper of this entity.