Two factors which are more frequent among malignant cases than among benign cases, and which can be used in the attempt to differentiate them, are the presence of more symptoms 86% vs. 66% and old age 66 vs. 60 9-11.
Un intento de diferenciar benignos de la variante maligna, muy rara, son la presencia de mayor sintomatología 86% vs. 66% y mayor edad 66 vs.