Primary Anterior Conjunctival Cyst Developed Over an Encapsulated Ahmed® Glaucoma Valve Device: A Case Report

Background Several studies have recommended glaucoma drainage devices (GDDs), particularly the use of the Ahmed glaucoma valve, as the primary surgical procedure. Nevertheless, surgical hypotony, capsular fibrosis, and tube failure are among the side effects of these devices. In this study, we report a case of the development of a conjunctival cyst as a complication of the surgical implantation of the Ahmed glaucoma valve device. Case Presentation A 21-year-old man who was diagnosed with bilateral congenital glaucoma presented with a persistently high intraocular pressure even after undergoing bilateral trabeculectomy and trabeculotomy with mitomycin C. After that, Ahmed glaucoma valve was employed, which led to an improvement in IOP postoperatively; however, upon follow-up, we noticed by clinical examination the development of a large encapsulated subconjunctival cyst, and then prompt surgical excision of the cyst was performed. Conclusion Formation of a large conjunctival cyst is one of the complications that can be noticed post-AGV (Ahmed® glaucoma valve) use. This case showed the surgical resection of the cyst to be essential and effective. More investigations are needed to address this complication with proper preoperative counselling for any postoperative GGD complications occurring in the patients.