Secondary Glaucoma Resulting From Choroidal Melanoma in a Patient With Congenital Nevus of Ota.

Purpose: First, to report nevus of Ota accompanying ocular melanoma in Thai patients. Second, to report angle-closure glaucoma as a presentation secondary to ocular melanoma along with a pathological report giving insight into the pathophysiology of secondary glaucoma in uveal melanoma. Observations: This case describes a patient with a nevus of Ota who experienced gradual, painless vision loss in the left eye, coinciding with the nevus location. Over 7 months, the patient's vision progressively worsened, culminating in the diagnosis of rhegmatogenous retinal detachment. Tumor identification was first achieved through fundus examination at a tertiary care center, and the tumor was subsequently confirmed via ocular ultrasonography. The patient elected against eye enucleation. The patient presented again as a secondary angle-closure glaucoma resulting from ocular melanoma. Conclusions and Importance: This case highlighted the importance of a rare malignant tumor that can accompany a nevus of Ota. Patient symptoms can vary from visual loss to a painful eye. Physician must be aware of the disease and include melanoma in the differential diagnosis in patients with a nevus of Ota. Thorough eye examination is important. Ocular ultrasonography is feasible, simple, and crucial for diagnosis. Accurate staging is vital for choosing the correct treatment strategy to save the patient's life.