Nagata Y, Ohba T, Tahara T, Masumi T
Department of Dental Radiology, Kyusyu Dental College, Japan.
Dentomaxillofac Radiol. 1997 May;26(3):192-4. doi: 10.1038/sj.dmfr.4600233.
To evaluate the validity of MRI in detecting spread of mandibular gingival carcinoma within the bone marrow. SCHEME: Three patients with mandibular gingival carcinoma were examined by panoramic radiography, CT, MRI and radionuclide scanning. The resected mandibles were examined histologically for invasion of bone marrow by the tumor.
With MRI the bone marrow in all cases had a low signal intensity on the T1-weighted images, a high signal intensity on the T2-weighted, and high signal intensity on the contrast-enhanced T1-weighted. In one case there was an obvious evidence of tumor invasion of the bone marrow histologically, but in two cases only dilatation of the blood vessels and evidence of hemorrhage associated with tumor.
MRI is not specific for detecting tumor invasion of bone marrow in mandibular gingival carcinoma.
评估磁共振成像（MRI）检测下颌牙龈癌骨髓扩散的有效性。
对3例下颌牙龈癌患者进行全景X线摄影、CT、MRI和放射性核素扫描检查。对切除的下颌骨进行组织学检查，以确定肿瘤是否侵犯骨髓。
在MRI检查中，所有病例的骨髓在T1加权图像上呈低信号强度，在T2加权图像上呈高信号强度，在增强T1加权图像上呈高信号强度。1例在组织学上有明显的肿瘤侵犯骨髓的证据，但2例仅见血管扩张及与肿瘤相关的出血证据。
MRI对检测下颌牙龈癌骨髓侵犯不具有特异性。
