Capillary hemangiomas or hemangioblastomas occur in angiomatosis retinae (von Hippel-Lindau disease).
Hemangiomas are rare.
These arebenigncongenital changes. There may be an autosomaldominant inheritance.
Loss of visual acuity will result where exudative retinal detach-ment develops.
Retinal hemangiomas are charac-terized by thickened tortuous arteries and veins (Figs. 12.37a and b). Bilateral changes are present in 50% of all patients.
Coatsâ€™ disease, branching retinal hemangiomas inWyburn-Mason syndrome, and cavernous hemangiomas should be con-sidered. Cerebral hemangiomas, renal cysts, hypernephromas, and pheochro-mocytomas should also be excluded.
Retinal hemangiomas may be treated by laser or cryocauterytherapy. However, exudative retinal detachment will develop as the treat-ment increases this risk.
The disorder is gradually progressive. Theprognosis for visual acuity is poor in the disorder where retinal detachment develops.