From Big Medical Encyclopedia

HORIOIDPAPILLOMA [chorioid-papilloma; lat. (plexus) of chorioideus vascular texture + papilloma; synonym: papilloma of a vascular texture, p lek a mustache papilloma, horioid-ny papilloma] — a benign neuroectodermal tumor, coming from an epithelium of vascular textures of ventricles of a brain.

Horioidpapilloma makes, according to various researchers, 0,3 — 0,6% of all intracranial tumors. Occurs at children of a horioidpapillom more often than at adults (1,1 — 1,3% of all tumors of a brain and 1,5 — 1,6% of all neuroectodermal tumors). Horioidpapilloma is the most frequent intracranial tumor at newborns and children of the first year of life, to a thicket is observed at boys. Extremely seldom the malignant option of a horioidpapilloma — a horioidkartsinom meets (see).

Horioidpapilloma grows in a cavity of ventricles of a brain (see), very seldom is located in a mostomozzhechkovy corner, developing from a side ectropion of a vascular texture of the fourth ventricle, or in the big tank (the cerebellar and brain tank, T.). At children of a horioidpapillom it is localized preferential in side cerebral cavities, at adults — in a cavity of the fourth ventricle.

Macroscopically the horioidpapilloma represents a roundish node with a fine-grained or fleecy surface. In rare instances in the presence of the capsule the surface of a node happens smooth. On a section fabric of a tumor gray-pink, fine-grained, is slightly more dense than tissue of a brain. Sometimes contains smooth-bore cysts with serous, muciform or calcific contents.

Microscopically the tumor is presented the different size and a form by the fibers covered with the cylindrical epithelium similar to an epithelium of a normal vascular texture (see fig. 47 to St. Brain, t. 6, Art. 277). The multilayer arrangement of tumor cells is occasionally noted. The stroma of fibers consists of the friable connecting fabric surrounding thin-walled vessels. In nek-ry fibers dense connecting fabric with considerable number thinly - and the thick-walled, sometimes fallen-down vessels can be found. In a stroma of fibers deposits of salts of calcium are possible, the hyalinosis, hypostasis, fibrosis, etc.

Horioidpapilloma grows slowly in a type of quite accurately delimited node, filling a gleam of a ventricle, being sometimes accustomed to drinking with its walls, but not sprouting them. From a cavity of the fourth ventricle through Marangdi's opening (a median aperture of the fourth ventricle, T.) the tumor can burgeon in the cerebellar and brain tank, and through Lushki's opening (a side aperture of the fourth ventricle, T.) — in the side tank of a pitch of a liyev of the bridge, growing together with roots of cranial nerves. In nek-ry cases the separation of separate fibers leads to development of implantation metastasises on walls of cerebral cavities or in a subarachnoid space. The symptomatology depends on localization of a horioidia-pilloma and is shown by the all-brain symptoms connected with occlusion of outflow tracts of the cerebrospinal liquid leading to developing of the closed hydrocephaly (see). During the involvement in process of the fourth cerebral cavity symptoms of irritation of its bottom sometimes appear.

Diagnosis is based on a wedge, yielded and results of additional methods of a research. Have crucial importance a ventrikulografiya (see), a cerebral angiography (see), a computer tomography (see the Tomography computer), a gamma encephalography (see the Encephalography) and a ventrikuloskopiya (see).

Treatment operational. In case of full removal horioidpapillo-we and lack of implantation metastasises the forecast favorable.

See also Vascular textures, pathology.

Bibliography: J a n i sc h W., GiithertH. u. SchreiberD. Pathologie der Tumoren des ZentralTiervensystems, S. 246, 304, Jena, 1976; Russei D. S. a. Rubinstein L. J. Pathology of tumors of the nervous system, p. 30, 220, L., 1977.

S.Yu. Kasumova.