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Cerebrospinal fluid (CSF) rhinorrhea is one of the most common complications after trans-sphenoidal surgery. At present, transcranial or endoscopic surgery for CSF leakage requires general anesthesia to remove autologous fat or fascia to repair the leak, which is traumatic and costly. The authors present a case of a 25-year-old male patient with pituitary adenoma who experienced CSF rhinorrhea 10 days after undergoing endoscopic resection of the tumor. The authors innovatively sequential filled the leak with a gelatin sponge soaked in povidone-iodine solution and iodinated gauze under outpatient nasal endoscopy. The follow-up of 6 months showed no recurrence of CSF leakage. CSF leakage is the most common complication of trans-sphenoidal surgery. The authors suggest that for small cerebrospinal fluid leaks in the early stage after trans-sphenoidal surgery, the leakage should be first filled with gelatin sponge and iodoform gauze sequentially under outpatient nasal endoscopy, which may achieve a complete cure.