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Purpose Purpose of research ‐ to reveal laws of structure and distribution of intermembranaceous spaces of optic nerve intracanal part. Methods 43 bone blocks including optic canal with located in them membranes (dura, arachnoidea, pia), ophthalmic artery of people aged from 26 weeks of prenatal development till 75 years were histologically studied. The structure of optic nerve membranes and intermembranaceous spaces in the cranial, transitive and orbital compartments of optic canal were established. The received data were compared to optic canal MRI results of 27 patients (54 optic canals) aged from 2 months till 75 years on the "VISTA" МР‐tomograph 1 T intensity of magnetic field. Results Wide, uniform, continuous intermembranaceous spaces are characteristic for optic canal cranial compartment, medially and laterally of optic nerve they are more expressed. In optic canal orbital compartment subdural space is the narrowest, non‐uniform on MRI and bone blocks research. The subarahnoidal space is most expressed in cranial compartment of canal laterally of optic nerve above of it, and on MRI medially of nerve it is absent or narrow, non‐uniform, faltering crack (the similar data is received on histologic research). In transitive optic canal compartment there are separate fragments of subarahnoidal space or its absence in different directions from optic nerve (according to histologic research ‐ above of nerve). In orbital compartment this space in the most cases is closed above and below of optic nerve (by results of research of bone blocks ‐ on all circle of optic nerve). Conclusion The laws of intermembranaceous space structure and their distributions in optic canal were revealed. MRI was effective method in study of intermembranaceous spaces of optic nerve intracanal part. [ABSTRACT FROM AUTHOR]

The article describes unusual caval-portal anastomosis via paraumbilical veins, which has resulted in the hepatic pseudolesion around the falciform ligament. We present a case of a 41-year-old male diagnosed with superior vena cava syndrome. Abdominal CT identified hypervascular pseudolesion from the Sappey superior veins.

The aim of this work is to reveal the optic canal (OC) development regularities. It is of importance to identify the anatomical preconditions of tunnel syndrome and other pathologies of the OC. One hundred and five human embryos (195 OC, out of them 98 - left-hand, 97 - right-hand) from 4 up to 70 mm parietococcygeal length (PCL) have been studied. The diameters of the optic nerve (ON) and OC in its orbital, cranial apertures and middle part have been defined. In the same way the distances between the OC walls and the ON and ophthalmic artery have been measured. We have come to the conclusion that the morphogenesis of the OC walls is an asynchronous process. The development of the OC upper wall is retarded. Some asymmetry of the morphometric characteristics of the right and left OC has been revealed. The development of the OC depends on the organization of all its elements. The periods of the OC development have been identified. The OC constitutional features of its aperture form, the size of the OC walls and its apertures, ON size, the correlation between ON and OC diameters of the OC cranial and orbital apertures and "waist", and the arrangement of the OC compartments were revealed. The individual and typical features of the OC structure, revealed as a result of computer tomography (CT) analysis, account for CT effectiveness in the diagnosis of OC changes and the structures located in it.