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Also known as
Penile prosthesis cylinder aneurysm, inflatable cylinder aneurysm, prosthetic cylinder herniation, cylinder bulging, penile implant aneurysm, IPP cylinder aneurysm
Definition
Cylinder aneurysm refers to the ballooning or bulging of an inflatable penile prosthesis cylinder, representing an uncommon mechanical complication of penile prosthesis surgery1. This condition occurs when the cylinder wall develops a localized weakness that causes the device to balloon outward during inflation, creating a visible and palpable bulge that compromises normal function1,2. The aneurysm typically manifests as a herniation of the prosthetic cylinder through weakened areas of the silicone or fabric layers, leading to improper inflation patterns and potential device malfunction2. Cylinder aneurysms are considered mechanical failures that require surgical revision with replacement of the affected component3. The condition is characterized by the presence of a persistent bulge that becomes more pronounced during attempted inflation4.
Clinical Context
Cylinder aneurysms are diagnosed clinically when patients present with a palpable lump or bulge that persists after deflation of the penile prosthesis2,4. This complication typically occurs months to years after initial implantation, with recent data showing a median time to mechanical failure of 41-48 months depending on the device manufacturer6. Among mechanical failures specifically, cylinder aneurysms represent approximately 9.5-11.1% of device failures across major manufacturers6. For certain three-piece inflatable devices, the rate of cylinder aneurysms or leaks was 4.7% with a median follow-up of 91 months2. Patient selection criteria for diagnosis include men with inflatable penile prostheses who report incomplete deflation, visible bulging, or asymmetric penile appearance during inflation attempts2. Risk factors may include oversizing of cylinders and concurrent Peyronie’s disease2,3. The surgical management involves complete device revision rather than isolated cylinder replacement to minimize infection risk and prevent recurrent mechanical failure3,5. Revision surgery typically yields excellent results when performed with appropriate surgical technique and complete component replacement2. Success rates for revision surgery are generally high, with most patients returning to normal prosthetic function post-operatively2. Recovery timeline can vary, with some patients able to activate the device within two weeks, though standard protocols typically recommend 4-6 weeks of healing before device activation2.