Cisneros Ana Isabel, Whyte Jaime, Martínez Claudio, Gracia-Tello Borja, Whyte Ana, Obón Jesús, Crovetto Rafael, Crovetto Miguel Ángel
Department of Human Anatomy and Histology, School of Medicine, University of Zaragoza, C/Domingo Miral, s/n, 50009, Zaragoza, Spain,
Surg Radiol Anat. 2014 Mar;36(2):137-40. doi: 10.1007/s00276-013-1155-8. Epub 2013 Jun 20.
The identification and definition of the radiological patterns of the posterior semicircular canal (PSC), with a view to obtain readily applicable conclusions.
The parietal morphology of the PSC has been studied by multi-slice helical computed tomography (Philips Brilliance 6). We have determined the distribution of the different types of bone cover of the PSC, taking some previously notified, standardised measurements of normality as reference.
318 patients have been analysed (604 petrous bone) by CT and we have distinguished five different radiological patterns: type or normal, thick, thin, pneumatised and dehiscent. The first three patterns, normal, thick and thin, have in common the existence of a compact bone interposed between PSC and posterior fossa, being in the normal pattern has a thickness of between 0.9 and 2.5 mm (327 cases, 54.13%), in the thick pattern is ≥2.6 mm (99 cases, 16.39%) and in the thin pattern is ≤1.2 mm (158 cases, 26.15%). The fourth pattern, pneumatised, is characterised by having retro labyrinthine cells between PSC and media fossa (19 cases, 3.14%). Finally, a dehiscent pattern was observed in 2 cases (0.3%).
We describe five different radiological patterns: type or normal, thick, thin, pneumatised and dehiscent. The thin type (<0.5 mm or papyraceous type) and the dehiscent type would be subject to producing pathology, and in some cases the latter could be a consequence of the former.
识别并定义后半规管（PSC）的放射学模式，以便得出易于应用的结论。
采用多层螺旋计算机断层扫描（飞利浦Brilliance 6）研究PSC的顶壁形态。我们以一些先前公布的标准化正常测量值为参考，确定了PSC不同类型骨覆盖的分布情况。
通过CT分析了318例患者（604侧颞骨），我们区分出五种不同的放射学模式：正常型、增厚型、变薄型、气化型和裂开型。前三种模式，即正常型、增厚型和变薄型，其共同特点是在PSC和后颅窝之间存在致密骨，正常模式下致密骨厚度在0.9至2.5毫米之间（327例，54.13%），增厚模式下≥2.6毫米（99例，16.39%），变薄模式下≤1.2毫米（158例，26.15%）。第四种模式，气化型，其特征是在PSC和中颅窝之间存在迷路后气房（19例，3.14%）。最后，观察到2例裂开型（0.3%）。
我们描述了五种不同的放射学模式：正常型、增厚型、变薄型、气化型和裂开型。变薄型（<0.5毫米或纸样型）和裂开型可能会引发病变，在某些情况下，后者可能是前者的结果。
