骨样骨瘤的影像学诊断

目的分析骨样骨瘤的X线、CT及MRI表现,探讨其影像学特征。方法搜集经临床及病理证实的骨样骨瘤23例,男19例,女4例。所有病例均行X线检查,其中同时行CT检查者19例,行MR检查者7例,3种检查都进行者6例。分析骨样骨瘤的X线、CT和MRI表现,及其对瘤巢和瘤巢周围改变的显示能力,总结其特征性的影像学表现。结果23例病灶均显示一直径0.2～2.1cm大小不等的圆形或椭圆形瘤巢,边界清楚,边缘骨质不同程度硬化,骨膜反应,骨髓腔及软组织水肿或关节腔积液。24例X线平片17例显示瘤巢,19例行CT检查者均清晰显示瘤巢,7例行MR检查者5例可显示瘤巢,2例需结合X线及CT检查方能肯定诊断。X线、CT及MR对瘤巢的显示率分别为73.9%(17/23)、100%(19/19)及71.4%(5/7)。结论瘤巢是骨样骨瘤的特征性表现,CT检查是诊断骨样骨瘤最准确的方法,X线检查是诊断骨样骨瘤的重要方法,MR检查对显示瘤巢周围骨髓、软组织及关节腔情况非常敏感,仅凭X线或MR的表现易造成误诊、漏诊。     

骨样骨瘤的影像诊断

目的探讨骨样骨瘤的X线、CT与MR表现。方法搜集我院2006—2007年经手术病理证实的骨样骨瘤20例,其中男性12例,女性8例,年龄11~37岁,平均年龄24岁。所有病例均行X线检查,其中行CT检查者6例,行MR检查者8例。分析上述3种影像检查对骨样骨瘤瘤巢的显示率。结果在常规X线检查中20例病灶均表现为一圆形或卵圆形的透亮区,直径>5~16 mm,周围可见不同程度的骨质硬化;其中16例可以看到瘤巢,显示率为80%;6例经CT薄层扫描均可清楚显示瘤巢,显示率为100%;8例行MR检查,其中6例可显示瘤巢,并可见瘤巢周围的软组织肿胀,瘤巢显示率为75%。结论瘤巢是确诊骨样骨瘤的关键。常规X线是诊断骨样骨瘤的首先检查方法,CT是显示瘤巢最可靠的方法,MR显示瘤巢不如CT敏感,但却可以清楚的显示瘤巢周围的软组织肿胀情况。     

X线平片和CT诊断骨样骨瘤的能力:64层CT后处理的价值

目的:分析骨样骨瘤的X线和CT表现,探讨64层CT对骨样骨瘤的诊断价值.方法:经手术病理证实的骨样骨瘤19例,男13例,女6例,年龄12～44岁,平均21.5岁.所有病例均行X线检查,同时行CT检查者12例,其中行64层CT检查者4例.分析骨样骨瘤的X线和CT表现,分析2种检查方法对瘤巢和瘤巢周围改变的显示能力.结果:19例病灶均表现为一圆形或卵圆形透亮区,直径0.4～1.7cm(平均10.2cm),其周围有不同程度的骨质硬化,5例周围软组织肿胀.19例中X线平片显示瘤巢14例,12例行CT检查者均清楚显示瘤巢,X线和CT对瘤巢的显示率分别为73.7% (14/19)和100% (12/12).结论:X线平片是诊断骨样骨瘤的重要检查方法,64层CT结合其后处理技术对发现瘤巢和正确诊断骨样骨瘤有重要价值.     

MR增强扫描在骨样骨瘤诊断中的临床价值

目的分析骨样骨瘤的X线、CT、MRI的影像表现,总结其影像学特征,比较不种影像学检查方法的诊断价值,优化检查,提高对骨样骨瘤的诊断及鉴别诊断能力。方法对我院经手术或穿刺病理证实的32例骨样骨瘤的影像学表现进行回顾性分析。男23例,女9例,男女之比2.61;年龄1.6~42岁,平均年龄9岁。13例同时行X线、CT、MRI检查,26例行X检查,21例行CT检查,20例行MRI检查,8例增强。结果32例骨样骨瘤中,有24例出现大小不一的圆形或椭圆形瘤巢,直径为0.28^-2.22cm,瘤巢周围伴有不同程度的骨质硬化。X线对瘤巢显示率为35%(9/26),4例瘤巢中心出现钙化;CT对瘤巢显示率为90%(19/21),出现钙化者16例,8例显示“血管沟征”;MRI平扫对瘤巢显示率为55%(11/20),增强MRI对瘤巢的显示率为100%(8/8)。20例MRI检查均显示不同程度的骨髓水肿。结论瘤巢是确诊骨样骨瘤的关键,MRI增强扫描对瘤巢的显示率不亚于CT,增强MRI检查在一定程度上能够准确地诊断骨样骨瘤,不用暴露于放射线就可定位瘤巢。     

骨样骨瘤的X线、CT和MRI表现和诊断价值

目的分析骨样骨瘤的X线、CT和MRI表现,评价它们的诊断价值。方法经手术病理证实,同时有X线、CT和MRI检查的骨样骨瘤22例,其中男19例,女3例。分析X线、CT和MRI对瘤巢和瘤巢周围改变的显示能力。结果X线、CT和MRI分别有17、22和20例表现为有一圆形或卵圆形小于2cm的瘤巢,瘤巢周围可有程度不一的骨质硬化、骨膜反应、软组织及骨髓腔水肿或相邻关节的肿胀。X线诊断的准确率为77.3%（17/22）;CT诊断的准确率为100%（22/22）;MR诊断的准确率为90.9%（20/22）。结论大多数的骨样骨瘤具有较典型的影像学表现,易于诊断,其中以CT对瘤巢的定位最为准确,单凭X线或MR的表现可因未能显示瘤巢而误、漏诊。     

骨样骨瘤的X线和CT表现

目的 :分析骨样骨瘤的X线和CT表现。方法 :搜集经手术病理证实的骨样骨瘤 2 3例。所有病例均行X线和CT检查 ,分析影像表现特征及其对瘤巢及瘤巢周围改变的显示能力。结果 :2 3例病灶均表现为一圆形或卵圆形的透亮区 ,直径 0 .4～ 1.7cm ,平均 0 .98cm ,其周围有不同程度的骨质硬化。X线和CT对瘤巢显示率分别为 78.3 %( 18/2 3 )和 10 0 %( 2 3 /2 3 )。结论 :瘤巢是确诊骨样骨瘤的关键 ,X线平片是诊断骨样骨瘤的重要检查方法 ,CT是显示瘤巢的最佳方法。     

骨样骨瘤的影像学表现及诊断价值分析

目的:分析骨样骨瘤的X线、CT、MRI及SPECT-CT融合图像的表现,总结其影像学特征。方法:对我院经手术或穿刺病理证实的28例骨样骨瘤的影像学表现进行回顾性分析。25例行X线检查,20例行CT检查,7例行MRI检查,9例行SPECT-CT图像融合。结果:28例均出现大小不一的圆形或椭圆形瘤巢,直径为2.3~19.5mm,瘤巢周围伴有不同程度的骨质硬化。X线对瘤巢显示率为48%(12/25),4例瘤巢中心出现钙化;CT对瘤巢显示率为95%(19/20),出现钙化者16例,2例显示"血管沟征";SPECT-CT融合图像,9例瘤巢均有显像剂团状异常浓聚,呈"太阳征";MRI对瘤巢显示率为57%(4/7),7例均显示不同程度骨髓水肿。结论:瘤巢是确诊骨样骨瘤的关键,CT是发现瘤巢的较好方法,SPECT有利于发现隐匿性病变,SPECT-CT融合图像可以明确病变及其累及的范围。     

骨样骨瘤的影像学诊断:X线平片与CT常规横断位及MPR比较

目的:比较常规X线平片、多层螺旋CT常规横断位及多平面重组(multi-planar reformation,MPR)在骨样骨瘤诊断中的价值。方法:回顾性分析41例骨样骨瘤病人在X线平片、CT常规横断位及MPR图像上的表现及其对瘤巢及瘤巢内钙化显示能力。结果:41例病灶均表现为一圆形或卵圆形的透亮区,其周围有不同程度的骨质硬化。41例中仅8例在X线平片上能显示瘤巢,瘤巢显示率为19.5%(8/41);所有检查者均清楚显示瘤巢周围骨质硬化,但均不能显示瘤巢内钙化;41例CT横断位图像及MPR图像均能清楚显示瘤巢,18例CT横断位图像能显示瘤巢内钙化,30例病人在MPR图像能显示瘤巢内钙化;横断位CT图像和MPR对瘤巢内钙化显示率分别为43.9%(18/41)和73.2%(30/41)。结论:瘤巢是确诊骨样骨瘤的关键,CT是显示瘤巢的重要检查方法,MPR图像是显示瘤巢内钙化的最佳方法,有助于做出准确诊断。     

骨样骨瘤的影像学诊断

骨样骨瘤是一种较常见的良性骨肿瘤，瘤巢的确定是影像诊断骨样骨瘤的关键。平片仍然是诊断骨样骨瘤的重要手段，CT是目前发现瘤巢的最佳方法，MRI可为骨样骨瘤的诊断提供较大的帮助，尤其能敏感地显示瘤巢周围髓内和软组织的炎性水肿，但可能造成误诊。     

骨样骨瘤的影像学诊断

骨样骨瘤是一种较常见的良性骨肿瘤，瘤巢的确定是影像诊断骨样骨瘤的关键。平片仍然诊断骨样骨瘤的重要手段，CT是目前发现瘤巢的最佳方法，MRI可为骨样瘤的诊断提供较大的帮助，尤其能敏感地显示瘤巢周围髓内和软组织的炎性水肿，但可能造成误诊。     

Osteoid osteoma: MR imaging revisited

To assess and compare with computed tomography (CT) the performance of magnetic resonance (MR) imaging in the detection of osteoid osteoma, and determine the features of this lesion on MR imaging. The prospective MR imaging and CT diagnosis of osteoid osteoma was determined from original radiology reports. MR images were assessed retrospectively with regard to the location and signal intensity of the nidus and surrounding bone marrow and soft tissue edema. These findings were correlated with the age of the patient, duration of symptoms, and drug therapy. Ten patients with histologically proven osteoid osteoma who underwent MR imaging were reviewed. All 10 lesions were correctly diagnosed at the time of MR imaging. None of the lesions was intracortical. Nine lesions were intra-articular. Two out of five patients with extracortical lesions had false negative CT preceding the MR study. Signal intensity of the nidus, marrow, and soft tissue edema on MR imaging were variable. Perinidal edema was most pronounced in younger patients and had no apparent relation to drug therapy. MR imaging reliably demonstrates the nidus of an osteoid osteoma, which has a variable appearance related to its position relative to the cortex of the bone. A predominance of cancellous osteoid osteomas are encountered in patients referred for MR imaging. Marrow edema in the vicinity of the lesion improves the conspicuity of the nidus. CT may fail to diagnose osteoid osteoma when the nidus is in a cancellous location, due to the lack of perinidal density alteration.     

Osteoid osteoma in atypical locations: the added value of dynamic gadolinium-enhanced MR imaging

Purpose

To compare the results of dynamic gadolinium-enhanced magnetic resonance imaging (MRI), unenhanced MRI and computed tomography (CT), in terms of nidus conspicuity and diagnostic confidence of osteoid osteoma in atypical sites.

Materials and methods

CT and MR (nonenhanced T1- and T2-weighted and dynamic MRI) images of 19 patients with histologically proven osteoid osteoma located in atypical sites were retrospectively reviewed. Time-enhancement curves of the nidus and the adjacent bone marrow were generated. Images from each technique were scored for nidus conspicuity by two independent radiologists. Another blinded radiologist was asked to assess final diagnosis of the bone lesion on MR and CT images, independently.

Results

In all cases, nidus contrast uptake started in the arterial phase and was higher compared to the surrounding bone marrow. Dynamic MRI significantly increased nidus conspicuity compared to nonenhanced MRI (P < .0001) and CT (P = .04). In 6/19 (31.6%) cases nidus conspicuity was higher at dynamic MRI compared to CT. Confident diagnosis of osteoid osteoma was achieved in all patients with MRI and in 10/19 (52.6%) patients with CT.

Conclusion

In patients with osteoid osteoma located in atypical sites, dynamic MRI increases nidus conspicuity, allowing confident diagnosis.     

骨样骨瘤的影像诊断

目的评价平片、CT,MRI对骨样骨瘤的诊断价值.方法18例骨样骨瘤均摄平片,其中16例经CT检查,4例行MRI检查;分析骨样骨瘤的平片、CT,MBI影像学表现.结果骨样骨瘤典型表现为瘤巢及周围反应性骨质硬化,且随病变部位不同而有所差异.诊断准确性平片为92.9%,CT为100%,MRI为83.3%.结论平片是诊断骨样骨瘤的基本手段,CT为最可靠方法,MRI需结合平片、CT进行诊断.     

The diagnostic accuracy of MR imaging in osteoid osteoma

OBJECTIVE: To analyse the MR imaging appearances of a large series of osteoid osteomas, to assess the ability of MR imaging to detect the tumour, and to identify potential reasons for misdiagnosis. DESIGN AND PATIENTS: The MR imaging findings of 43 patients with osteoid osteoma were reviewed retrospectively and then compared with other imaging modalities to assess the accuracy of MR localisation and interpretation. RESULTS: The potential for a missed diagnosis was 35% based solely on the MR investigations. This included six tumours which were not seen and nine which were poorly visualised. The major determinants of the diagnostic accuracy of MR imaging were the MR technique, skeletal location, and preliminary radiographic appearances. There was a wide spectrum of MR signal appearances of the lesion. The tumour was identified in 65% of sequences performed in the axial plane. The nidus was present in only one slice of the optimal sequence in 27 patients. Reactive bone changes were present in 33 and soft tissue changes in 37 patients. CONCLUSION: Reliance on MR imaging alone may lead to misdiagnosis. As the osteoid osteoma may be difficult to identify and the MR features easily misinterpreted, optimisation of MR technique is crucial in reducing the risk of missing the diagnosis. Unexplained areas of bone marrow oedema in particular require further imaging (scintigraphy and CT) to exclude an osteoid osteoma.