Introduction
Affects ~6-10% of the population, but often seen accidentally.
- Dark due to eumelanin
- Light due to amelanotic, which represents 9% of naevi
- Surface drusen may suggest chronicity
- Is usually flat or slightly elevated no more than 1mm
- Diameter typically <5mm
Dead Giveaways
Naevus or Melanoma?
Typically, melanomas have overlying orange pigment and subretinal fluid
Subretinal fluid indicated typically via hyperAF lipofuscin, or OCT
diagnostic features
Risk of Naevus Change:
TFSOM-UDHH --> "To Find Small Ocular Melanoma, Using Daily Helpful Hints"
Thickness > 2mm in ultrasound
Fluid in subretina on OCT
Symptoms of visual loss or poor VA
Orange pigments
Ultrasound
Hollowness
TFSOM-DIM --> "To Find Small Ocular Melanoma Doing IMaging"
M for melanoma with hollow ultrasound
DIM for diameter > 5 mm on fundus photography