“…Most knots can be untied percutaneously using simple maneuvers, especially in case of lumen catheters where insertion of a guidewire through the catheter's central lumen would often help to unravel the knot [ [1] , [2] , [3] , [4] ]. Unlooping of knot, by passing a guidewire through the loop followed by balloon dilatation [ 5 , 6 ] or hooking and pulling it with a pigtail catheter [ 1 ] or 0.035″ J tipped guide wire [ 7 ] is also described. However in our case, absence of central lumen, lead stiffness and knot complexity made its retrieval more difficult than lumen catheters and required special techniques.…”