Ectopia cordis (EC) is a rare malformation that occurs as an isolated lesion or as part of the pentalogy of Cantrell which is characterized by midline closure defects. This was first described by Haller et al. in 1706. EC is seen with a frequency of 5.5-7.9 per 1 million births. It has five types that are: cervical, cervico-thoracic, thoracic, thoraco-abdominal, and abdominal. Its differentiation from the pentalogy of Cantrell, first described by Cantrell in 1958, must be done well. Thoracic type has the worst prognosis and due to this poor prognosis in the postnatal period, termination may be offered to these patients as an option. In this paper, a case of an isolated thoracic-type complete EC detected in the prenatal ultrasonography of a pregnant woman referred to our clinic at the 18 weeks and 3 days of gestation is presented.