Objective-To report the epidemiology and ocular phenotype of retinal capillary hemangioblastomas associated with von Hippel-Lindau (VHL) disease in a large cohort of patients and to correlate patient and ocular characteristics to visual morbidity in this population.
Design-Prospective consecutive case series.Participants-In 220 unrelated pedigrees, 335 patients affected with VHL disease and retinal capillary hemangioblastomas (RCHs) in at least 1 eye.Methods-Demographics of the patient population were recorded and the ocular phenotype of each patient was obtained with a comprehensive ocular examination.Main Outcome Measures-The patient population was characterized and the ocular phenotype described in relationship to tumor location, number, and extent of retinal involvement. Correlations between patient demographics, ocular phenotype, and visual function were analyzed.Results-RCHs were detected unilaterally in 42.1% and bilaterally in 57.9% of patients. No correlation was detected between the age, gender, and laterality of involvement. Eighty-seven (86.6%) percent of involved eyes had tumors that could be individually visualized; of these, tumors were commonly found in the peripheral retina (84.7%) only, and less commonly in the juxtapapillary area (15.3%). The tumor count in the periphery averaged 2.5±1.8 per eye, with 25.2% of eyes having greater than 1 quadrant of retinal involvement. Thirteen (13.4%) percent of involved eyes were enucleated or pre-phthsical; approximately 1 in 5 patients had one or more eyes so affected. Severe visual impairment (visual acuity worse or equal to 20/160) in affected eyes were more likely to be associated with increasing age, the presence of juxtapapillary lesions, and an increasing number and extent of peripheral lesions.Conclusions-This large cohort of VHL patients with RCHs has enabled a systematic and quantitative characterization of the demographics, ocular features, and visual function in VHL disease. Clinical correlations between the visual morbidity and ocular features of the disease were also performed, producing measures that can help clinicians better estimate visual prognoses based on the ocular phenotype of the disease. RCHs in VHL disease are benign tumors that have a characteristic orange-red color, a globular shape, and typically dilated feeding and draining vessels. Histologically, they are comprised of capillary-like vascular channels surrounded by large vacuolated stromal cells, and also smaller "tumorlet" cells that express stem cell markers 3 . RCHs can be highly variable in their number, size, and location. Although often slow-growing in nature and benign in their effect, they can sometimes result in vision loss and structural disruption to the integrity of the globe through exudative and tractional effects on the retina 4 .The diagnosis of VHL disease is often performed clinically, using criteria involving a family history of the disease and the detection and characteristic tumors in various organ systems 5 . Genetic testing for VHL disease is now...