Fig. 1
From: Rare case of urethral catheter knot formation in a woman during elective surgery
Photograph showing the removed urinary catheter after incomplete deflation of the balloon. The urinary catheter was removed manually after withdrawing 7 of 10 mL of distilled water in the balloon on the third postoperative day. A knot developed 6 cm from the tip of the catheter. The knot likely formed when the Foley catheter was inserted further to confirm urine outflow, at which time the catheter coiled back onto itself. The catheter was radiolucent; therefore, we could not identify the knot until the catheter was removed