Sinus cysts, most commonly seen in the maxillary sinus, are common clinically and are usually accomplished endoscopically. However, recurrence after surgery is often encountered clinically in cases referred from outside hospitals, and as far as the cause is concerned, it may be due to insufficient thoroughness during the first surgery. Of course, there may be other reasons as well. As far as the surgical method is concerned, how to remove it completely? The method we use is to endoscopically enter first through the natural sinus opening of the maxillary sinus, and with the cutter try to remove as much as possible at once. If there is still a residual sinus cavity after endoscopic examination at different angles, it should also be removed from the inferior nasal tract, which is often referred to as the “double path” method of maxillary sinus cyst removal. Our rough experience is that there are few cases of recurrence after this approach. There are several considerations for using the inferior nasal pathway: 1. The mucosal incision depends on the size and location of the cyst. For example, larger cysts require the incision to be moved forward for full exposure. 2. The mucoperiosteal flap should be preserved and protected as much as possible. 3.The cyst should be observed clearly and resected thoroughly. Pay attention to remove the base of the cyst. 4.After surgery, local filling material is needed to facilitate recovery. If necessary, the mucoperiosteal flap can also be filled in both directions from the sinus cavity and the inferior nasal tract to ensure the recovery of the mucoperiosteal flap. In general, for the treatment of such cases, one is to grasp the indications for surgery, the second is to study the surgical method, the third is to take auxiliary incisions, such as the lower nasal canal window, if necessary, and the fourth is to pay attention to the method of local filling after surgery, such as choosing a soft material for expansion and hemostasis. Hint: Clinically, we often encounter cases where sinus cysts have been removed endoscopically through the conventional natural opening of the maxillary sinus, but a relatively large cyst remains after examination through the opening of the inferior nasal tract, so complete removal of the cyst through the opening of the inferior nasal tract is the appropriate procedure if necessary.