ObjectiveTo observe the OCT angiography (OCTA) imaging features of isolated choroidal hemangioma (CCH).MethodsA retrospective case study. From January 2017 to February 2019, 18 CCH patients (18 eyes) diagnosed in the Affiliated Eye Hospital of Nanjing Medical University were included in the study. There were 13 males (13 eyes) and 5 females (5 eyes), with the mean age of 44.5 years. All the tumors were orange-red, with clear boundaries, located at the posterior pole or around the optic disc. OCTA was used to scan the 6 mm×6 mm of macular area or in the range of 6 mm×6 mm. After automatic image processing, the system provided the blood flow map of shallow capillary plexus, deep capillary plexus, outer retina and choroidal capillary plexus, as well as the corresponding structure en-face image and B-scan image.ResultsOCTA examination found that when the stratification line was adjusted to the periphery of the choroidal capillary layer, the blood flow map showed clear boundary of the tumor, and the blood vessels on the surface of the tumor presented a network crisscross with different thickness. B-scan image showed that the whole layer of retinal choroid at the tumor presented a dome-shaped uplift, and the neurocortical layer could be accompanied by thickening, subretinal effusion, exudation and splitting. En-face image showed that the boundary of the tumor was clear, the surrounding exudation was strong reflection in spots or patches, local pigmentation showed weak reflection, and the signal reflection was uneven.ConclusionOCTA can clearly show the vascular morphology on the surface of CCH.
