Veterios Veterinary Hospital, C. de Arrastaria, 23, Madrid, 28022, Spain.
Veterinary Teaching Hospital, Complutense University of Madrid, Avda. Puerta de Hierro s/n, Madrid, 28040, Spain.
Vet Res Commun. 2024 Dec;48(6):3975-3980. doi: 10.1007/s11259-024-10535-5. Epub 2024 Sep 12.
Open-mouth jaw locking is an uncommon condition in feline patients. A 5-year-old neutered male Persian cat was evaluated for an acute inability to close its mouth and ptyalism. The general physical examination was unremarkable. A complete oral examination revealed a reduced vertical range of motion, as well as an asymmetric malocclusion with severe displacement of the mandibles to the left. Advanced diagnostic imaging included computed tomography (CT), which revealed a typical brachycephalic conformation, skeletal malocclusion and a bilateral temporomandibular joint (TMJ) subluxation, with the left coronoid process of the mandible abnormally positioned ventrolateral to the zygomatic arch. The open-mouth jaw locking was manually reduced and resolved. Once the coronoid process was repositioned, a second CT scan was performed and confirmed complete reduction of the TMJ subluxation. Supportive treatment with meloxicam was administered and a loose-fitting tape muzzle and Elizabethan collar were applied for two weeks. There was no recurrence of open-mouth jaw locking at long-term follow-up. This case report highlights the relevance of CT imaging and 3-dimensional reconstruction in the diagnosis of this unusual condition.
张口下颌锁定在猫科动物患者中较为少见。一只 5 岁已绝育雄性波斯猫因急性无法闭口和流涎而接受评估。一般体格检查无明显异常。全口检查显示垂直运动范围减小，以及不对称的咬合不正，下颌骨严重向左移位。先进的诊断影像学包括计算机断层扫描（CT），显示出典型的短头畸形、骨骼咬合不正和双侧颞下颌关节（TMJ）半脱位，下颌骨的冠状突异常位于颧骨弓的腹外侧。通过手动复位解决了张口下颌锁定问题。一旦冠状突重新定位，就进行了第二次 CT 扫描，证实 TMJ 半脱位完全复位。给予美洛昔康进行支持性治疗，并应用宽松的胶带口罩和伊丽莎白项圈两周。在长期随访中没有再次出现张口下颌锁定。本病例报告强调了 CT 成像和 3 维重建在诊断这种不常见情况中的重要性。
