[A case of ring melanoma found while treating traumatic glaucoma].

BACKGROUND: Ring melanoma, a malignant melanoma which infiltrates over 180 degrees degrees of the ciliary body is very rare in Japan. We report a case of ring melanoma found while treating treatment of traumatic glaucoma with an ultrasound biomicroscope (UBM). CASE: A 44-year old woman presented with high intraocular pressure after blunt trauma in her left eye. CLINICAL FINDINGS: Best-corrected visual acuity OS was 1.2, and intraocular pressure was 30 mmHg. Gonioscopy showed about 180 degrees of the angle recession. Intraocular pressure was difficult to control in spite of anti-glaucoma drug treatment. Rapid progression of iris elevation and 360 degrees thickening of the ciliary body were detected by UBM. We detected atypical cells with melanine granules in the aqueous fluid and positive findings in PET-CT, leading to a diagnosis of ciliary body malignant melanoma. Consequently we enucleated the left eye. The histopathological diagnosis was ring melanoma. CONCLUSION: Ring melanoma is an important element in the differential diagnosis for untreatable secondary glaucoma.