Screw Misposition and Detachment During Paranasal Augmentation: A Patient Report With Complication and Management.

Paranasal concavity is esthetically displeasing and interferes with the overall outline of the face. Paranasal augmentation with alloplastic implants is a minimally invasive procedure with significant esthetic effects for paranasal concavity. When fixing the implants, the screws should be placed on the nasofrontal column, but are occasionally mispositioned on the anterior wall of the maxillary sinus. Here, the authors introduce a case of paranasal augmentation in which the self-tapping screw accidentally penetrated through the implant, broke through the anterior and medial walls of the maxillary sinus, and entered the nasal cavity. The screw was located by a computed tomography scan and was successfully removed under a nasal endoscope. The causes of this intraoperative complication were analyzed, emergent management was introduced, and a further preventive strategy was proposed.