Detrusor-sphincter dyssynergia refers to failure of the urethral sphin
cter to relax during detrusor contraction. The cause is a central nerv
ous system lesion located between the brain stem micturition center an
d the sacral spinal cord. This is an extremely rare condition in cats.
It may be confused with a failure of urethral relaxation due to local
urethral causes such as inflammation or edema. This article reviews d
etrusor-sphincter dyssynergia to allow the reader to distinguish this
rare condition from more common conditions that prevent bladder emptyi
ng.