If you were asked to remove this drain, located in the perinephric space, what should you remember to do before giving it a good hard pull?
Look for and release the string which holds the pig-tail catheter curled (most catheters have one). If you don't release it by untying it or cutting it you will find it difficult to pull the catheter out.
Films obtained following perinephric abscess drainage. Large staghorn calculus with several noncontiguous large calculi filling dilated renal calyces in the left kidney. The left renal shadow is enlarged. Pigtail drainage catheter projects over the left inferior pole, compatible with abscess drainage catheter. No right-sided renal tract or ureteric calculi. Hyperdense faecal material in the left-sided colon and rectum compatible with mixed enteric contrast.