Case summary A 33-month-old. spayed female domestic shorthair cat was referred to the Animal Health Trust for the investigation of urinary incontinence and straining to urinate. A membrane-like structure was detected in the bladder neck. which caused partial obstruction of the urinary bladder. https://www.bekindtopets.com/limited-value-Microline-S1229RS-TFC-RO-Membrane-35-50-gpd-mega-choice/