A 51-year-old Eastern Mediterranean male without known systemic medical illness referred to our clinic with a painless loss of vision for 2 months in the left eye. The diagnosis of choroidal malignant melanoma was suspected when fundus examination and ocular ultrasonography were done after the continuous deterioration in visual acuity. Orbital magnetic resonance imaging evaluation was consisted with choroidal melanoma and enucleation was performed. The post-operative histopathologic report confirmed the choroidal malignant melanoma. This report highlights the importance of B-scan ocu-lar ultrasonography in evaluating an eye with deteriorating visual complaints.