--- title: "Growth Without Transformation: When a Choroidal Naevus Gets Bigger but Isn’t Melanoma" description: "\"Growth\" is alarming, but it does not always equal melanoma. Some choroidal naevi demonstrate slow enlargement without developing other high-risk features. ² The key clinical distinction is between: - Benign enlargement: minimal/no change in thickness, no new subretinal fluid, no…" url: "https://bluefinvision.com/knowledge-base/topics/conditions-diseases/growth-without-transformation-when-a-choroidal-naevus-gets-bigger-but-isnt-melanoma/" updated: "2026-02-16" category: "Conditions & Diseases" --- # Growth Without Transformation: When a Choroidal Naevus Gets Bigger but Isn’t Melanoma "Growth" is alarming, but it does not always equal melanoma. Some choroidal naevi demonstrate slow enlargement without developing other high-risk features. ² The key clinical distinction is between: - Benign enlargement: minimal/no change in thickness, no new subretinal fluid, no new orange pigment, stable symptoms - High-risk growth: growth accompanied by new risk features (fluid, lipofuscin/orange pigment, increasing thickness, symptoms) ¹ ² This is why follow-up relies on serial, standardised imaging, not subjective impressions. A lesion can appear larger because of better image quality, clearer media, or improved alignment, so clinicians prioritise measured basal dimensions and thickness, plus objective signs of activity. ³ Large series demonstrate that while many naevi remain stable, lesions with multiple risk factors have substantially higher rates of growth into melanoma. ² Conversely, real-world referral datasets also show that nevus growth can occur without melanoma transformation, reinforcing the need to interpret enlargement in context. ³ If growth is suspected, the safest pathway is repeat multimodal imaging, documentation of specific risk features, and early ocular oncology input when uncertainty remains. ¹ ² **References** 1. Shields CL, Cater J, Shields JA, Singh AD, Santos MC, Carvalho C. Combination of clinical factors predictive of growth of small choroidal melanocytic tumors. Archives of Ophthalmology. 2000;118(3):360-364. doi:10.1001/archopht.118.3.360. PMID: 10712878. 2. Shields CL, Furuta M, Berman EL, Zahler JD, Hoberman DM, Dinh DH, et al. Choroidal nevus transformation into melanoma: analysis of 2514 consecutive cases. Archives of Ophthalmology. 2009;127(8):981-987. doi:10.1001/archophthalmol.2009.151. PMID: 19667334. 3. Qureshi MB, Lentz PC, Xu TT, White LJ, Olsen TW, Pulido JS, et al. Choroidal nevus features associated with subspecialty referral. Ophthalmology Retina. 2023;7(12):1097-1108. doi:10.1016/j.oret.2023.07.022. PMID: 37517800. **Related Topics** - [When Does a "Freckle" in the Eye Become Concerning?](https://bluefinvision.com/blog/when-does-a-freckle-in-the-eye-become-concerning/) - [What Does a "Freckle in the Eye" Actually Mean? 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