[A case of cranioencephalopagus]

A rare case of head accretion of monozygotic girl-twins 6 years of age has been investigated. The common cavity of the endocranium has appeared as a result of accretion of the skull cap bones. The truncal parts of the brain have not any peculiarities, parts of the diencephalon and telencephalon are deformed. In each brain the corpus callosum and fornix are not defined anatomically. A complex configuration of the III ventricle cavity, common for both brains, is formed by means of turned to each other medial surfaces of the thalami and subthalamic parts. Oppositely situating pair of the thalami of both brains is connected by means of the white substance cord. This case is described as an example of cranioencephalopagus (diencephalopagus).