Their macroscopic aspects depend on their size which varies between 0.8 and 3.8 cm. Microscopically it is possible to distinguish three categories: tumors with fusiform cells 77%, epitheloid tumors 8%, and mixed tumors 15% 3,5,7.
Su aspecto macroscópico depende del tamaño, que oscila entre 0,8 y 38 cm; microscópicamente se distinguen tres categorías: tumores de células fusiformes 77%, tumores epitelioides 8% y tumores mixtos 15% 3, 5, 7.