Features of choroidal naevi on swept source optical coherence tomography angiography and structural reverse flow optical coherence tomography

Abstract

OCTA presents characteristic changes in the choriocapillaris layers in cases of choroidal naevi. The association of naevus substance appearing darker with increasing thickness may offer a novel prognostic clue. En face structural OCT may allow accurate, detailed measurement of lateral dimensions which could be of value in the monitoring of suspicious naevi.

Optical coherence tomography angiography (OCTA) applications in ocular oncology

“…In a study of 71 eyes, the visibility of nevus in en face OCTA was 79.5%. Moreover, the thickness greater than 120 μm was associated with darker masses in en face OCTA, which could be interpreted as a prognostic factor [ 18 ] (Fig. 1 ).…”

“…It is shown that relatively flat nevi do not alter the outer retinal vessels in OCTA; however, errors in automatic segmentation of retinal layers disturb the visualization of the vasculature in the outer retina in thicker tumours [ 18 ].…”

Swept-Source Optical Coherence Tomography Angiography in Small Choroidal Melanomas and Choroidal Nevi

“…Two recent studies revealed successful vascular evaluation of choroidal nevi and melanomas using SS-OCTA. The first study by Ali et al 10 focused on the use of structural reverse flow to identify choroidal nevi. The second study by Pellegrini et al 11 showed the ability of SS-OCTA to identify tumor microvasculature in choroidal melanomas.…”

Ultra-wide-field imaging assessment of small choroidal pigmented lesions using red and green colour channels

“…OCT has improved visibility of the choroid as enhanced depth imaging or swept-source OCT [9][10], autofluorescence scans have confirmed lipofuscin deposition [11] and optical coherence tomography angiography may give information on blood flow. [12] Ultrawide field imaging has been an important addition in this array of imaging modalities because of the ability of capture a wide area of the fundus. In the assessment of intraocular tumours, it has allowed better depiction of the extent of sizable or very peripheral tumours not easily captured with previously available cameras.…”