3D弥散法MR膝关节造影对半月板损伤诊断价值的探讨

目的:探讨3D弥散法MR膝关节造影诊断半月板撕裂的临床应用价值。方法: 收集自2013年1月至2014年1月的42例临床怀疑半月板撕裂的患者,其中男31例,女11例;年龄21～67岁,平均38.4岁;病程2 h～15 d;临床症状是膝关节痛。首先采用膝关节常规MR平扫,然后进行3D弥散法MR膝关节造影检查,全部病例经关节镜或手术证实,将常规平扫结果和3D弥散法关节造影诊断结果与关节镜或手术结果对照,对比两种方法在显示半月板撕裂图像敏感性和特异性方面的差异。结果:3D弥散法MR膝关节造影使半月板撕裂处信号强度明显高于常规平扫,同时检查的敏感性从52.94%(54/102)提高到85.79%(87/102),特异性从67.78%(61/90)提高到86.67%(78/90).对两种方法进行χ²检验,敏感性及特异性之间差异有统计学意义(χ²=25.90,P<0.01; χ²=9.13,P<0.01).结论:3D弥散法膝关节造影对半月板撕裂图像敏感性及特异性均优于常规MR平扫。     

Application of the three-dimensionally printed biodegradable polycaprolactone (PCL) mesh in repair of orbital wall fractures

PurposeThe present study aims to investigate the surface characteristics and biomechanical properties of 3D-printed polycaprolactone (PCL) mesh and present the clinical outcomes of this implant in the treatment of orbital wall fractures.Patients and methodA retrospective review of patients who underwent surgery for medial, inferior and inferomedial orbital wall fractures using PCL mesh was performed between April 2017 and June 2018. Two clinical outcomes were investigated: functional recovery and anatomical accuracy of reduction detected in image. Furthermore, scanning electron microscopy was used to evaluate the microscopic morphology, surface characteristics, and porosity of the PCL mesh.ResultsAmong a total of 22 patients with a mean age of 41.3 years, the most common cause of injury was assault (54.5%). Fourteen patients (63.6%) had isolated orbital floor fractures. At postoperative 1-week follow-up, three patients (13.6%) exhibited diplopia and a further three patients (13.6%) showed restriction in ocular motility, but these patients had completely recovered by their 6-month postoperative follow-up. Ideal repair of orbital fracture was almost achieved in 21 patients (95.4%) and there were no cases of implant infection, inflammatory response, migration of implant, or hemorrhage. Microscopic imaging of PCL mesh surface revealed fully interconnected micropores with 50% porosity.ConclusionsThe repair of orbital wall fracture using PCL mesh offers reliable stabilization of orbital wall defects with a low complication rate, leading to outstanding functional and aesthetic outcomes. Therefore, PCL mesh is a good alternative for bioresorbable implants in the treatment of orbital wall fractures.     

原发性肝脏癌肉瘤一例的CT表现

原发于肝脏的癌肉瘤极为罕见。我们发现一例56岁男性患者,经病理免疫组化确诊为原发性肝脏癌肉瘤。CT平扫检查发现肿块位于肝右叶胆囊窝旁,呈低密度,螺旋CT多期增强扫描显示肿块呈混合密度,强化不均匀,实性病灶明显强化,肿块内部可见多发低密度结节,边缘呈环形强化,肿块侵犯胆囊壁及横结肠。原发性肝脏癌肉瘤CT表现缺乏特征性,术前诊断困难。