Tehran University of Medical Sciences Journal of Craniomaxillofacial Research 2345-5489 7 1 2020 08 01 40 44 Shahabaldin Azizi Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Mehdi Bemanali Shahid Beheshti University of Medical Sciences, Tehran, Iran. Zahra Mousavi Shiraz University of Medical Sciences, Shiraz, Iran. Mahdieh Karimizadeh Department of Pediatric, Bushehr University of Medical Siences, Bushehr, Iran. 2020 06 07 2020 07 28 The LeFort I osteotomy is a versatile and simple procedure used by oral and maxillofacial surgeons for correction of congenital, developmental, or acquired dentofacial deformities. This technique is widely used due to its low complication rate such as rare, life-threatening events, reliable long-term results, and a high level of patient satisfaction. This report presents a case of LeFort I osteotomy  resulting in an unusual complication of pulmonary thromboembolism. Keywords: LeFort I osteotomy; Complication; Pulmonary thromboembolism. https://jcr.tums.ac.ir/index.php/jcr/article/view/328 https://jcr.tums.ac.ir/index.php/jcr/article/download/328/288