Kaiserman et al identified a number of factors which can be used to identify a choroidal nevus that is likely to progress to an ocular melanoma. The authors are from Barzilai Medical Center in Ashkelon, Israel.
Risk factors for progression:
(1) thickness >= 2.0 mm
(2) location at the posterior pole and/or on the nasal aspect
(3) initial largest base diameter (LBD) >= 7 mm
(4) combined K1 (with I subscripted) index >= 14.5
Parameter
Finding
Points
nasal location
absent
0
present
1
posterior pole location
absent
0
present
1
where:
• A large choroidal nevus could have both a nasal and posterior pole location.
combined KI =
= (largest base diameter in mm) + (4 * (thickness in mm)) + (points for nasal location) + (points for posterior pole location)
The followup period should be >= 1.5 years to detect any conversion.
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