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[Morphology and remote results of the treatment of arachnoidendothelioma (meningioma) of the vascular membrane of the eye].

Morphology of arachnoidendothelioma (30 cases) of the choroid of the eye was studied using stains and impregnation of the fibrous stroma of a tumour with silver. In 28 cases the fate of patients after the enucleation of the eye-bulb was followed-up for periods of 2-15 years. Depending on characteristics of cellular elements and specificity of the architectonics of the tumour tissue, three main variants of its structure were singled out: meningotheliomatous, insular, and fibroblast arachnoidendothelioma, according to the terminology accepted by neurooncologists. It was established that in most cases the tumour was non-pigmented or slightly pigmented. Its pigmentation was accounted for by the presence of three types of pigment cells: epithelioid cells of arachnoidendothelium containing fine-grained brown pigment, melanophages and process melanocytes. Arachnoidendothelioma of the choroid of the eye was characterized by an expansive character of growth. In a number of cases, however, there was noted an infiltrative growth of the tumour. Studies of the remote results of the treatment revealed no metastasizing. In one case a recurrence of the tumour took place. The author comes to the conclusion that, as to its histological structure, character of growth and prognosis of arachnoidendothelioma of the choroid of the eye is similar to arachnoidendothelioma localized in the meninx. A typical histological structure of this tumour makes it possible to differentiate it from melanoblastoma of the choroid of the eye.