Neurilemmoma at 10x Magnification
Histologically, two distinct regions of a neurilemmoma are recognized. Antoni A regions are areas that contain a large number of cells, chiefly benign spindle cells organized into overlapping bundles. The cells sometimes surround eosinophilic regions known as Verocay bodies. The density of cells in Antoni B regions is much less than in Antoni A regions. Loose connective tissue that has the appearance of a myxoma (benign tumor found predominantly in the heart) serves as the background to Antoni B cells.