Parlier-Cuau C, Champsaur P, Perrin E, Rabischong P, Lassau J P
Service de Radiologie Ostéo-Articulaire, Hôpital Lariboisiere, Assistance Publique-Hôpitaux de Paris, France.
Surg Radiol Anat. 1998;20(3):215-20. doi: 10.1007/BF01628898.
The aim of this study was to define the imaging of the retrotympanum precisely by means of high-resolution CT. Based on 66 scans of petrous bones performed in 49 patients observed in an otologic department, several retrotympanic structures were studied: the pyramidal eminence, ponticulus, subiculum, chordal ridge, tympanic sinus of Proctor, sinus tympani and recess of the facial n. The variations in morphology and depth were noted as well as the relationship between the pyramid and the facial canal. In a second phase the same anatomic structures were studied in 24 temporal bones removed from embalmed cadavers and investigated with the same radiologic technique. Anatomic correlations were made for six temporal bones to confirm the general applicability of our radiologic hypotheses. In CT the pyramidal eminence was visualised in 100% of cases, the chordal ridge in 52%, the ponticulus in 63% and the subiculum in 57%. As regards the different recesses, the sinus tympani was visualised in 95% of cases, the posterior tympanic sinus of Proctor in 38%, the fossula of Grivot in 47% and the facial recess in 80%. The mean depth of the sinus tympani was 2.7 mm and that of the tympanic sinus of Proctor was 1.65 mm; the fossula of Grivot was assessed as 2.1 mm and the facial recess as 2.2 mm. A better knowledge of these sinuses and their variations will aid the surgeon, particularly in a posterior tympanotomy or a retro-facial approach.
本研究的目的是通过高分辨率CT精确界定鼓室后隐窝的影像学表现。基于对耳鼻喉科49例患者进行的66次颞骨扫描，对几个鼓室后结构进行了研究：锥隆起、小 ponticulus、subiculum、弦嵴、Proctor鼓室窦、鼓室窦和面神经隐窝。记录了形态和深度的变化以及锥隆起与面神经管之间的关系。在第二阶段，对从防腐尸体上取下的24块颞骨进行了相同解剖结构的研究，并采用相同的放射学技术进行检查。对6块颞骨进行了解剖学关联，以证实我们放射学假设的普遍适用性。在CT中，100%的病例可显示锥隆起，52%可显示弦嵴，63%可显示小ponticulus，57%可显示subiculum。至于不同的隐窝，95%的病例可显示鼓室窦，38%可显示Proctor后鼓室窦，47%可显示Grivot小窝，80%可显示面神经隐窝。鼓室窦的平均深度为2.7mm，Proctor鼓室窦的平均深度为1.65mm；Grivot小窝评估为2.1mm，面神经隐窝为2.2mm。更好地了解这些窦及其变异将有助于外科医生，特别是在进行后鼓室切开术或面神经后入路时。
