An elderly woman who presented with severe irritative lower urinary tract symptoms after three consecutive collagen injections was diagnosed as being obstructed. The diagnosis was based on urodynamic, cystoscopic, and radiographic findings that disclosed numerous collagen deposits obstructing the bladder outlet and the proximal urethra. A transurethral resection of the collagen was performed with improvement in symptoms and flow pattern. Although irritative lower urinary tract symptoms after collagen injection could be related to local inflammatory changes, persistence and eventually worsening of these symptoms should alert to the presence of iatrogenic bladder outlet obstruction.
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