Vascular morphometry and micrometry of the orbital region of the human optic nerve.

The study aims at providing data on the vascular morphometry and micrometry of the orbital region of the human optic nerve. The disposition of the microcirculatory trunk in the orbital region has been studied on 40 samples taken post-mortem, as well as on 10 pieces from subjects having undergone enucleation. Histological specimens were prepared from the optic nerves using eosinhematoxylin dye-staining, the Romhany-Bârzu staining and the Gomory trichromic staining. Functionally active capillaries make up 19.380 per cent (7-14 micro group), respectively 21.318 per cent (15-20 micro group) of the total vessels in the area, having an average diameter of 10.01 +/- 0.0826085 p, respectively 17.9272 +/- 0.0651995 micro, for P = 0.05. There are 169 reserve capillaries (with a diameter between 2-6 micron), representing 32.752 of the total of vessels counted. The existence of reserve capillaries allows, at a certain point, for the supplying of the obstruction or of the vasospasm on the territory of the functionally active capillary

[Neovascularization in rat optic nerve]. / Studiu experimental al microcirculatiei nervului optic de sobolan.

The study aims at assessing possible age-induced alterations in the nervous vascular network by examining the microcirculation of the optic nerve in rats grouped by age. Histological specimens were stained with hematoxiline-eosine, the Romhany-Barzu dye staining and the Gomory tri-chromic dye staining. The volume, section surface and total surface of 2-6 micro and 7-14 micro vessels were determined on a total of 960 vessels of this group, over a five square millimeter area. The tables show the increase of vascular parameters from birth to adulthood, and the fact that not all the vessels were injected in old animals. The density of the vessels per square millimeter, their average length and average diameters, error calculus, variation coefficient, Student test and chi2 allow assessing the differences between animals belonging to the same species but to different age groups, or under the influence of medication.

[Computer tomography in primary orbital tumors]. / Importanta examinarii computer tomografice în patologia tumorala primara a cavitatilor orbitale.

PURPOSE: The aim of this study is to observe the anatomical changes that occur in the tumoral pathology of the orbit, as well as to underline the importance of computed tomographic examination in the investigation of the orbital tumoral pathology. MATERIAL AND METHOD: This study has been conducted in the Military Hospital of Timisoara by a team made of anatomists, radiologists and ophthalmologists. A number of 215 patients were examined over a period of six years, between 1998-2002. The computed tomography examinations were made with Picker IQ Premier equipment, using contiguous native axial sections of 2 to 5 mm thick, after intravenous injection of non-ionic contrast-enhancing substance for vascular identification and iodophilic quantification specific to each structure. RESULTS: From the 215 patients that had undergone a CT examination of the orbits, 41 cases had positive orbital tumoral pathology. The primary tumors of the optic nerve had the highest incidence being present in 12 cases, of which 9 with glioma and 3 with meningioma. The second most frequent were the vascular tumors revealed in 11 cases. CONCLUSION: Due to its diagnosis performances CT has to be considered as a routine investigation method, recommended as a method of choice in orbital tumoral pathology.