Teratomas belong to a group of germ cell tumors and consist of tissues that are derived from 3 germ layers. The localization of teratomas is extremely diverse. The main task of a morphological study is to diagnose the type of teratoma. According to the WHO classification, there are mature and immature teratomas (ICD-O codes 9080/0 and 9080/3, respectively). It is deemed that the disease prognosis does not depend on the composition of mature tissue components. This paper describes two sectional observations of congenital immature teratomas in a premature live birth infant and a stillborn one. One teratoma, such as epignathus, is a very rare tumor in localization. Emphasis is laid on the need for a thorough teratoma morphological study that defines the tactics of patient management. The described observations demonstrate the importance of timely prenatal diagnosis and an interdisciplinary approach, as well as the need for clear routing of patients with diagnosed fetal space-occupying lesions.
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