TUMORS of the pons are not common. McLean1 stated: "The slowly growing, relatively infrequent tumors of this region produce a kaleidoscopic wealth of signs which are myriad combinations of nuclear paralyses and projection-tract disturbances, a neurologic delight for diagnosis and neurosurgical despair for therapeusis."
The vascular tumors constitute only a very small portion of these tumors and are thus extremely rare.
A certain confusion still prevails with regard to the nomenclature of the vascular tumors of the central nervous system. Virchow2 classified the angiomatous anomalies as follows:
Cavernous angiomas, i. e., vascular tumors made up of dilated "cavernous" spaces with fused walls, so that neither glia nor specific nerve tissue, but only a sparse stroma resembling connective tissue, is found between the spaces
Vascular changes in which glia or nerve tissue is present between the individual lumina
Telangiectases (or simple angiomas), consisting of vessels of capillary structure
TEILMANN K. HEMANGIOMAS OF THE PONS. AMA Arch NeurPsych. 1953;69(2):208-223. doi:10.1001/archneurpsyc.1953.02320260066005