Ogura Ichiro, Nakahara Ken, Sasaki Yoshihiko, Sue Mikiko, Oda Takaaki
Chin J Dent Res. 2019;22(1):51-56. doi: 10.3290/j.cjdr.a41775.
To investigate the usefulness of diffusion-weighted magnetic resonance imaging (DWI) in odontogenic keratocysts, especially apparent diffusion coefficient (ADC) maps for the characterisation of normal structures and cystic lesions in the jaw.
Sixteen patients who underwent magnetic resonance imaging (MRI) for the diagnosis of a cystic lesion in the jaw were included in this prospective study. DWI was performed on a 1.5 T unit with b factor of 0 and 800 s/mm2, and ADC maps were generated. ADC values were measured for the normal structures in the upper neck area and for the cystic lesion in the jaw.
The mean ADC value of the cerebrospinal fluid (3.66 ± 0.47 × 10-3 mm2/s) in the upper neck area was higher than that of the nasal mucosa (1.80 ± 0.19 × 10-3 mm2/s), Waldeyer's ring (0.75 ± 0.11 × 10-3 mm2/s) and the spinal cord (0.71 ± 0.20 × 10-3 mm2/s). The mean ADC value of the five odontogenic keratocysts (1.03 ± 0.31 × 10-3 mm2/s) was lower than that of the one simple bone cyst (2.79 × 10-3 mm2/s), three nasopalatine duct cysts (2.28 ± 0.12 × 10-3 mm2/s), three radicular cysts (1.82 ± 0.71 × 10-3 mm2/s) and four dentigerous cysts (1.67 ± 1.06 × 10-3 mm2/s).
This study suggested the usefulness of DWI in odontogenic keratocysts, especially ADC maps for the characterization of normal structures and cystic lesions in the jaw.
探讨磁共振扩散加权成像（DWI）在牙源性角化囊肿中的应用价值，尤其是表观扩散系数（ADC）图在颌骨正常结构及囊性病变特征描述方面的作用。
本前瞻性研究纳入了16例因颌骨囊性病变接受磁共振成像（MRI）检查的患者。在1.5T设备上进行DWI检查，b值分别为0和800s/mm²，并生成ADC图。测量上颈部区域正常结构及颌骨囊性病变的ADC值。
上颈部区域脑脊液的平均ADC值（3.66±0.47×10⁻³mm²/s）高于鼻黏膜（1.80±0.19×10⁻³mm²/s）、咽淋巴环（0.75±0.11×10⁻³mm²/s）和脊髓（0.71±0.20×10⁻³mm²/s）。5个牙源性角化囊肿的平均ADC值（1.03±0.31×10⁻³mm²/s）低于1个单纯性骨囊肿（2.79×10⁻³mm²/s）、3个鼻腭管囊肿（2.28±0.12×10⁻³mm²/s）、3个根尖囊肿（1.82±0.71×10⁻³mm²/s）和4个含牙囊肿（1.67±1.06×10⁻³mm²/s）。
本研究表明DWI在牙源性角化囊肿中具有应用价值，尤其是ADC图在颌骨正常结构及囊性病变特征描述方面。
