Histological research has revealed that neoplasms consist of spindle-shaped and roundish cells, with a considerable amount of tissue basophiles. Strom makes a considerable part of tumors and is presented by incoherently located collagenic fibers, plexuses of which are intertwined and located divergently. Affected thin-walled vessels were detected inside tumors. In a preparation tissue basophiles and macrophages are located perivascularly. Immunomorphologic researches have shown that collagen of I and III types prevails in stroma. Positive coloring for S-100 protein, a marker of neurogenic cells, specified neurogenic origin of tumors.

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