Stone cone device detached resulting in unintended retention of foreign body in the pt's right ureter.This detachment was not discovered initially.During post-surgical f/u pt stated an umbrella like device which appeared to be made of cellophane passed through his urethra approx 2 weeks post-op.Ct scan revealed foreign body in the right ureter.Unable to remove the foreign body ureteroscopically.The pt required surgical intervention resulting in the removal of 2 mildly encrusted fragments of stone cone.
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