A case of bilateral diffuse uveal melanocytic proliferation with secondary angle closure caused by ciliary body thickening

PURPOSE: To describe a case of bilateral diffuse uveal melanocytic proliferation (BDUMP) with secondary angle closure caused by ciliary body thickening accompanied by intraocular pressure (IOP) elevation after mydriasis. OBSERVATIONS: A 55-year-old woman with a history of ovarian cancer had blurred vision in both eyes. Fundus examination revealed multiple patchy lesions in both eyes and a nevus-like elevated lesion in the right eye. Anterior segment optical coherence tomography (AS-OCT) and ultrasound biomicroscopy (UBM) demonstrated angle closure resulting from ciliary body thickening. After mydriasis, the IOP was elevated in both eyes. Instillation of a miotic drug successfully reversed the IOP to normal levels. CONCLUSIONS AND IMPORTANCE: BDUMP caused secondary angle closure in both eyes, presumably due to thickening of the entire ciliary body. AS-OCT and UBM were advantageous for analyzing the morphology of the anterior eye segment in BDUMP. Clinicians should be aware of the possibility of angle closure during the management of patients with BDUMP.