As the angioma grows, the walls of the blood vessels may weaken and some blood leakage may occur, causing damage to surrounding tissues. Blood leakage from angiomas in the retina can interfere with vision. Early detection and careful monitoring of the eye are very important to maintain healthy vision. Cysts may also grow around angiomas. Cysts are fluid-filled sacs which may exert pressure or create blockages which can cause symptoms.
Some male patients experience tumors in the scrotal sacs.
These tumors are almost always benign, but should be examined by a urologist. Cysts and tumors may also occur in the kidney, pancreas, liver, or adrenal glands. Symptoms here may include high blood pressure. Some of these tumors are benign, while others are cancerous. Early detection and careful monitoring are particularly important for these organ systems, usually with CT, MRI, or ultrasound scanning yearly.