Choroidal melanoma: clinical features, classification, and top 10 pseudomelanomas

Area of Science:

• Ophthalmology
• Oncology
• Medical Imaging

Background:

• Uveal melanoma is a rare but aggressive intraocular malignancy, predominantly affecting the choroid.
• Choroidal melanoma represents the most common form, necessitating accurate diagnosis and classification.
• Distinguishing choroidal melanoma from simulating lesions (pseudomelanomas) is critical for appropriate patient management.

Purpose of the Study:

• To review the current diagnostic features and classification systems for choroidal melanoma.
• To identify and describe lesions that mimic choroidal melanoma clinically (pseudomelanomas).

Main Methods:

• Review of current literature on choroidal melanoma and pseudomelanomas.
• Analysis of diagnostic criteria and classification systems, including the American Joint Committee on Cancer staging.
• Comparison of clinical features to differentiate melanoma from simulating lesions.

Main Results:

• Choroidal melanoma typically presents as a pigmented tumor with characteristic dimensions (median base 11mm, mean thickness 4.5mm).
• Prognosis is significantly influenced by genetic alterations (chromosomes 3, 6, 8) and tumor size, with increased thickness correlating to higher metastasis risk.
• Common pseudomelanomas include choroidal nevus, RPE abnormalities, and vascular conditions, each with distinct clinical presentations.

Conclusions:

• Choroidal melanoma is a significant malignancy requiring prompt diagnosis and treatment.
• Understanding the unique clinical features of choroidal melanoma and pseudomelanomas is key to accurate differentiation.
• Accurate staging and consideration of genetic factors are vital for determining prognosis and guiding therapy.