Minowa K, Sakakibara N, Yoshikawa K, Ohmori K, Kitagawa Y, Inoue N, Totsuka Y, Nakamura M
Department of Radiology, Hokkaido University School of Dentistry, Kita 13 Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
Dentomaxillofac Radiol. 2007 Feb;36(2):113-6. doi: 10.1259/dmfr/80737186.
We report the radiographical findings of a rare case of intraosseous schwannoma of the mandible. The tumour that presented as a unilocular, well-defined, radiolucent lesion on plain radiography was located in the molar region. On CT, the tumour was a well-demarcated mass with no periosteal reaction and no destruction of the bone cortex. Destructive changes in the cortical wall of the mandibular canal by the tumour were observed on CT, but no evidence of dilatation and shift in the inferior mandibular canal was seen. MR imaging revealed that the mandibular canal was encased by the tumour as a solid mass without cystic parts. The signal intensity of the tumour was non-specific on MRI. Characteristics of intraosseous schwannoma in the mandible are the encasement of the canal by a well-demarcated tumour without periosteal reaction and the destruction of mandibular bone cortex. The destructive change of the inferior mandibular canal can be observed on CT and MRI. However, a biopsy is necessary to make the final diagnosis because of the non-specificity of the findings.
我们报告了一例罕见的下颌骨骨内神经鞘瘤的影像学表现。该肿瘤在X线平片上表现为单房、边界清晰的透光性病变，位于磨牙区。CT显示，肿瘤为边界清晰的肿块，无骨膜反应，骨皮质无破坏。CT观察到肿瘤对下颌管皮质壁有破坏改变，但未见下颌管扩张和移位迹象。磁共振成像（MR）显示，下颌管被肿瘤包裹，呈实性肿块，无囊性部分。肿瘤在MRI上的信号强度无特异性。下颌骨骨内神经鞘瘤的特征是边界清晰的肿瘤包裹下颌管，无骨膜反应，下颌骨皮质破坏。CT和MRI均可观察到下颌管的破坏改变。然而，由于这些表现缺乏特异性，最终诊断仍需活检。
