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Endonasal endoscopic repair of medial orbital wall fractures is minimally invasive and benefits the patients. The authors describe the authors’ modified balloon technique, which allows longer support of the orbital wall. From October 2010 through January 2016, the author repaired 9 isolated medial wall fractures by this method. Five patients were diagnosed as having enophthalmos of greater than 2 mm, and 6 patients had persistent diplopia before the operation. The herniated orbital contents that filled the anterior ethmoidal sinus were gently reduced with a 4-mm-diameter 0° sinus endoscope. Then a posterior nasal cavity balloon (Type B # 32014, KOKEN Co, Japan) was inserted into the ethmoidal sinus and filled with normal saline. The inflation tube of the balloon was sutured to the nasal cavity wall with absorbable sutures. After checking the status of the balloon, the inflation tube was ligated and cut so that it could be hidden inside the nasal cavity. The balloon was removed on an outpatient basis 6 to 7 weeks after the surgery. In this series, the mean inflation volume of the balloon was 1.6 mL, the mean period of leaving the balloon in place was 5.7 weeks, and the mean operative time was 38.6 minutes.Resolution of the preoperative diplopia and enophthalmos was achieved in all 9 patients, and there was no recurrence of prolapse of the orbital contents. This method allows leaving the balloon in place for a long period of time without interfering with daily life, which reduces the risk of rebulging of the orbital contents.