滑膜血管瘤的影像诊断分析

目的 探讨滑膜血管瘤的影像学表现及临床诊断价值.资料与方法 回顾性分析经病理证实的16例(男9例,女7例)滑膜血管瘤患者资料,其中膝关节14例,肘关节1例,髋关节1例.X线平片检查13例,CT平扫1例,MRI平扫及增强扫描15例,血管造影1例.结果 X线平片可见软组织肿胀、静脉石、软组织肿块表现.CT表现为软组织肿胀及骨质侵蚀.血管造影见毛细血管期及静脉期对比剂滞留.MRI显示肿块T1 WI呈等低信号,T2WI呈"葡萄串"样高信号或不均匀等低信号,其内见条索状或网格状低信号分隔.MRI表现各异由病理组织成分不同所决定.结论 X线平片、CT、血管造影对滑膜血管瘤定性诊断价值有限,MRI 对滑膜血管瘤的定位及定性诊断具有重要价值,是术前诊断的首选方法,对治疗方案的选择具有指导作用.     

骶骨骨巨细胞瘤X线、CT及MRI表现

目的分析骶骨骨巨细胞瘤(GCT)的X线、CT和MRI表现特点,探讨三种影像检查方法的临床应用价值。资料与方法 21例骶骨GCT均经手术病理证实,所有病例均行X线、CT和MRI检查,分析骶骨GCT的X线平片、CT、MRI表现特点,将影像学表现与手术病理结果进行对照,并经双盲法分析确认。结果 21例中,X线和CT显示囊性膨胀性骨质破坏18例,溶骨性骨质破坏15例,骨包壳不完整14例,MRI显示骨质破坏10例。X线显示侵犯骶髂关节及髂骨5例,CT显示16例,MRI显示11例。CT平扫显示软组织肿块12例,CT增强显示16例,MRI显示16例,其中巨大囊实性软组织肿块12例,10例可见液平面,病灶周围可见软组织水肿及骨髓水肿。骨质破坏在MR SE T1WI上呈等低信号,T2WI呈等信号。骨包壳在MRI上表现为低信号,X线和CT上表现为硬化环。软组织肿块实性部分在T1WI为等信号,T2WI及短时反转恢复(STIR)呈等高信号。囊性部分在T1WI为低信号,T2WI及STIR呈等高信号。软组织水肿及骨髓水肿在T2WI及STIR呈高信号。CT和MRI增强软组织肿块实性部分明显强化,囊性部分不强化。结论 X线、CT和MRI从不...     

肩关节米粒体滑囊炎的影像学诊断

【摘要】目的：探讨肩关节米粒体滑囊炎的影像学表现,加强对该病的认识。方法：回顾性分析经临床、影像确诊的12例肩关节米粒体滑囊炎患者的影像学表现,X线、CT检查主要观察肩关节的骨性结构,有无骨质侵蚀;MRI检查主要观察米粒体、滑膜的信号特点及周围软组织情况。结果：12例患者X线、CT均表现为软组织肿胀、密度不均匀,4例伴肱骨头局限性骨质破坏,边缘未见明显硬化。与骨骼肌相比,所有米粒体在T1WI上呈等信号,T2WI抑脂序列呈稍高信号,米粒体直径为2～7mm,周围有增生滑膜,10例米粒体位于肩峰下滑囊,滑膜增生以肩峰下滑囊为主,可伴肱二头肌长头腱腱鞘（3例）、喙突下滑囊（3例）、肩关节囊滑膜增生（4例）。骨质侵蚀患者病变显示清楚,周围不伴骨髓水肿表现。关节积液较少。结论：肩关节米粒体滑膜炎有相对特征性的影像学表现,依据X线、CT、MRI表现能够正确诊断。     

腱鞘巨细胞瘤的影像学表现

目的分析和总结腱鞘巨细胞瘤(GCTTS)的影像学表现。方法分析20例GCTTS患者X线、CT、MRI影像及病理资料,所有患者经病理或手术证实。10例行X线检查,9例行CT平扫检查,4例同时行增强检查,2例同时行关节CT造影检查,19例行MRI平扫。结果7例X线平片骨质破坏,2例仅见关节周围软组织肿胀,骨质见硬化边,关节间隙正常,均未见钙化及骨膜反应。CT平扫关节周围等密度肿块,密度不均匀,边缘不清楚;8例见明显骨质破坏;1例骨质可见硬化边,均未见钙化及骨膜反应。关节CT造影及增强扫描肿块呈中度至明显的不均匀强化。T1WI 14例与骨骼肌信号对比呈等信号,内见斑点状低信号,5例呈稍低信号;T2WI与骨骼肌信号对比13例呈混杂信号,内见线条状低信号,6例呈高信号。结论GCTTS的影像表现有一定的特点,X线、CT显示邻近骨质压迫吸收、侵蚀性改变,MRI能够反映GCTTS内部的双低信号特征。     

滑膜肉瘤的影像学诊断

目的 探讨滑膜肉瘤的影像学特征.方法 搜集经病理证实的滑膜肉瘤22例,所有病例均行X线检查,其中同时行CT检查者18例,行MR检查者20例,3种检查都进行者15例.分析其X线、CT及MRI表现,总结影像学特征.结果 22例滑膜肉瘤均临近关节,16例位置深在.X线及CT表现为略高密度软组织肿块,5例肿块内有钙化,7例邻近有骨质破坏.MRI T1WI呈略低信号,T2WI呈高信号,13例肿块内有坏死、囊变区,9例肿瘤内可见条形低信号间隔,增强后肿瘤10/13例呈显著且不均匀强化.结论 滑膜肉瘤具有一定的影像学特征,MRI是诊断滑膜肉瘤的首选方法.     

腱鞘巨细胞瘤的影像学诊断(附13例分析)

目的：探讨腱鞘巨细胞瘤的影像学诊断。方法：回顾性分析13例经手术和病理证实的腱鞘巨细胞瘤的影像资料,局限型9例,弥漫型4例,所有病例均行X线检查,4例行CT平扫和增强扫描,9例行MR平扫,6例同时行增强扫描。结果：X线片仅显示关节旁软组织肿块和骨质侵蚀、破坏。CT平扫显示软组织肿块和骨质改变较X线片清晰,还有1例显示软组织钙化和液化,增强扫描软组织肿块呈轻到中度强化。MRI T1WI上7例呈较均匀等信号,2例呈不均匀等低信号;T2WI上3例呈不均匀等高信号,6例呈不均匀等低信号;6例增强扫描呈中度到明显不均匀强化。结论：X线和CT检查对大多数腱鞘巨细胞瘤可明确诊断;MRI检查、尤其是增强扫描对于发现特异性含铁血黄素信号和确定病变范围具有独特优势,有助于提高诊断符合率,同时对指导临床治疗和随访具有重要价值。     

成软骨细胞瘤影像学诊断

目的 探讨成软骨细胞瘤影像学表现特点。资料与方法 分析22例经手术病理或穿刺活检证实的成软骨细胞瘤资料,总结其X线平片、CT和MRI表现。结果 胫骨上端18例,股骨下端2例,肱骨上端2例。表现为骨骺区分叶状骨质破坏区,内见钙化和更低密度区;MR T1WI以低信号为主,T2WI上信号混杂,扩散加权成像（DWI）上呈等高信号。硬化边厚薄不一。病灶周围在X线和CT上见高密度骨质硬化区,MRI表现为骨髓水肿。骨膜反应常不与病灶相邻,MRI上为长T1、短T2信号,与皮质间见条状高信号。邻近软组织肿胀,部分患者见关节积液。MRI上病灶可呈环状或较均匀强化,骨髓水肿、骨膜反应和软组织肿胀均强化。结论 成软骨细胞瘤影像学表现较有特征性,结合X线平片、CT和MRI能做出正确诊断。     

腱鞘巨细胞瘤的影像学分析

目的 分析腱鞘巨细胞瘤(giant cell tumor of tendon sheath,GCTTS)的影像学表现以增加对该病的影像学认识,提高影像诊断的准确率.方法 收集2009年9月～2012年11月14例经手术病理组织证实的GCTTS患者X线、CT、MRI影像进行回顾性分析.其中14例行X线平片检查,6例行CT平扫检查,8例行MRI平扫及增强扫描.结果 X线平片显示局部稍高密度软组织肿块影,邻近骨质未见明显异常或轻度侵蚀破坏;CT表现为关节周围肌间隙内局限性软组织肿块,部分呈分叶状,明显跨关节生长,无明显钙化征象及骨膜反应;MRI表现为病灶在T1WI多呈较低信号,内可见条片状更低信号影,T2WI呈高低混杂信号,增强后强化明显,病灶与邻近肌腱关系密切,局部骨皮质可受侵.结论 腱鞘巨细胞瘤的影像学表现具有一定的特征性.     

色素沉着绒毛结节性滑膜炎的影像学诊断

目的:探讨色素沉着绒毛结节性滑膜炎(PVNS)的影像学表现。方法:回顾性分析14例经手术及病理证实的PVNS患者的X线平片、CT、MRI等影像学资料。结果:14例X线检查者均见关节囊肿胀,其中8例骨质受侵蚀,1例可见软组织肿块。8例CT检查均示关节囊肿胀,其中6例可见关节腔积液及周围骨质受侵蚀,2例见软组织肿块影,2例增强扫描者均可见强化的滑膜结节和增厚的滑膜。10例MR检查者弥漫型8例,局限型2例,均可见到关节囊肿胀及数量不等的增生滑膜绒毛结节,其中9例在增生滑膜内可见含铁血黄素沉着,呈长T1、短T2低信号,8例关节腔积液及骨质受侵蚀,3例见软组织肿块,3例增强扫描者示增厚的滑膜和结节明显强化。结论:MRI对色素沉着绒毛结节性滑膜炎诊断及鉴别诊断具有重要价值,是一种简单、无创、有效的检查手段。     

软骨母细胞瘤MRI及X线平片和CT的表现特征

目的 研究软骨母细胞瘤的影像表现,探讨其MRI与X线平片、CT征象的对应关系.方法 分析16例经手术、病理证实的良性软骨母细胞瘤的影像资料,总结其MRI表现与X线平片、CT征象的对应关系.结果 16例软骨母细胞瘤均位于骨骺,大小为0.9 cm×0.8 cm×1.0 cm～4.8 cm×4.3 cm×5.1 cm,呈不同程度的分叶状.在T1WI上以等、低信号为主,T2WI上呈混杂信号,CT上为软组织密度,内见钙化和更低密度区.边缘呈长T1、短T2信号,在CT上表现为硬化边.MRI可见病灶周围有骨髓水肿,在X线和CT上表现为骨质硬化区.病灶邻近软组织肿胀.MRI显示骨膜异常9例,8例与病灶不相邻;X线和(或)CT显示骨膜新生骨6例.MRI显示关节积液12例,CT显示6例.MRI上病灶均呈不均匀强化,骨髓水肿、骨膜反应和软组织肿胀均见强化.软骨母细胞瘤在扩散加权成像(DWI)上呈等、高信号,在MR平扫中的等T1、等T2成分和长T1、长T2成分,以及骨髓水肿、骨膜反应和软组织肿胀在DWI上均呈高信号.结论 MRI和X线平片、CT从不同方面反映软骨母细胞瘤的病理改变,联合应用不同检查手段可更全面显示软骨母细胞瘤的特点.     

Synovial hemangioma: imaging features in eight histologically proven cases,review of the literature,and differential diagnosis

Objective This study was undertaken to describe the imaging characteristics of synovial hemangioma, with the goal of improving the disappointing rate (22%) of clinical diagnosis of this condition. A review of the literature and the differential diagnosis of intra-articular lesions, including synovial osteochondromatosis and pigmented villonodular synovitis, are also presented.Patients The subjects of the study were 8 patients (4 males, 4 females; age range: 5–47 years; mean age: 19 years) with histologically confirmed synovial hemangioma involving the knee (n=7) or wrist (n=1). We retrospectively examined the imaging studies performed in these patients, including plain radiography (n=8), magnetic resonance imaging (MRI; n=4), angiography (n=3), arthrography (n=2), and contrast-enhanced computed tomography (CT; n=2).Results Plain radiographs showed a soft tissue density suggesting either joint effusion or a mass in all patients. Phleboliths and bone erosions on plain films in four patients with extra-articular soft tissue involvement pointed to the correct diagnosis. Angiography, showing fine-caliber, smooth-walled vessels, contrast pooling in dilated vascular spaces, and early visualization of venous structures, was diagnostic in two patients. Neither arthrography nor CT yielded specific enough findings. MRI was consistently effective in allowing the correct diagnosis to be made preoperatively, showing an intra-articular or juxta-articular mass of intermediate signal intensity on T1-weighted images and of high signal intensity on T2or T2^*-weighted images with low-signal channels or septa within it. A fluid-fluid level was found in two patients with a cavernous-type lesion.Conclusion Despite the limited nature of this study, it shows clearly that MRI is the procedure of choice whenever an intra-articular vascular lesion such as synovial hemangioma is suspected. Nonetheless, phleboliths and evidence of extra-articular extension on plain radiographs point to angiography as an effective procedure of first resort because it can be combined with embolotherapy.     

Intraocular tumors: evaluation with MR imaging

Sixty-seven ocular tumors were studied with magnetic resonance (MR) imaging and computed tomography (CT). These tumors included primary uveal melanoma (n = 55), circumscribed choroidal hemangioma (n = 3), diffuse choroidal hemangioma (n = 1), retinal capillary hemangioma (n = 1), medulloepithelioma (n = 1), choroidal nevus (n = 1), retinoblastoma (n = 1), and choroidal metastases (n = 4). MR imaging demonstrated all these lesions, while CT demonstrated 88%. Associated retinal detachment was more easily distinguished from the neoplasms with MR imaging. Extrascleral extension of melanoma and hemorrhagic cystic necrosis within the melanoma were clearly demonstrated with MR imaging, but not with CT. Ninety-three percent of melanomas were markedly hyperintense, compared with the intensity of the vitreous body, on T1-weighted images and hypointense on T2-weighted images. All metastatic lesions were isointense on T1-weighted images and hypointense on T2-weighted images. The circumscribed choroidal hemangiomas were hyperintense on T1-weighted images and isointense on T2-weighted images. MR imaging is superior to CT in detection of intraocular tumors and may be more specific in diagnosis.     

Amyloid arthropathy of the hip joint: MR demonstration of presumed amyloid lesions in 152 patients with long-term hemodialysis

The aim of this study was to determine the spectrum of MR findings of presumed amyloid arthropathy of the hip joints in patients on long-term hemodialysis. We prospectively performed T1- and T2-weighted spin-echo imaging on 152 consecutive patients on hemodialysis. The duration of hemodialysis ranged from 5 months to 24 years, 2 months (mean: 8 years, 8 months). The frequency, location, and signal intensity of bone lesions were assessed. In 12 cases with contrast-enhanced MR examination, enhancement pattern of bone lesions, synovial lesions, and intra-articular lesions were characterized. Bone lesions presumed to be amyloid deposits were identified in 60 patients (39 %). Magnetic resonance imaging revealed that amyloid lesions were more extensive than anticipated by plain radiographs. All bone lesions showed decreased signal intensity on T1-weighted images. On T2-weighted images, bone lesions showed increased signal intensity in 32 patients (54 %), decreased signal intensity in 11 patients (18 %), and both increased and decreased signal intensity in 17 patients (28 %). Following intravenous injection of gadolinium-based contrast, all bone lesions showed moderate enhancement. Synovial thickening could not be identified on T1- and T2-weighted images. However, contrast-enhanced images showed thickened synovial membrane, which could be differentiated from joint fluid. Intra-articular nodules showed decreased or intermediate signal intensity on T1-weighted images and decreased signal intensity on T2-weighted images; the intra-articular nodules were contiguous with subchondral bone lesions. Magnetic resonance imaging is useful for evaluating the distribution and extent of amyloidosis of the hip joints in patients undergoing long-term hemodialysis. Received 5 August 1997; Revision received 22 October 1997; Accepted 11 February 1998     

Imaging strategies in the evaluation of soft-tissue hemangiomas of the extremities: correlation of the findings of plain radiography,angiography, CT,MRI, and ultrasonography in 12 histologically proven cases

Twelve patients with the histologic diagnosis of soft-tissue hemangioma of the extremities (nine intramuscular, two subcutaneous, and one synovial) were evaluated in a retrospective study using plain film radiography (n = 12), angiography (n = 8), computed tomography (CT; n = 4), magnetic resonance imaging (MRI; n = 3), and ultrasonography (US; n = 2). In eight of nine intramuscular lesions, the plain film demonstration of phleboliths suggested the diagnosis, while the plain radiographs were normal in three. Angiograms showed the pathognomonic features of soft-tissue hemangioma in six patients. MRI was characteristic in all three patients: The lesion demonstrated intermediate signal intensity on T1-weighted spin echo images and extremely bright signal on T2-weighting. US showed a hypoechoic soft-tissue mass in one case and a mixed echo pattern in the other. In one case, a central echogenic focus with acoustic shadowing consistent with a calcified phlebolith was identified, and one lesion exhibited increased color flow and low resistance arterial Doppler signal. CT showed a nonspecific mass in one of four cases and a mass with phleboliths in three. If a deep hemangioma is suspected, we recommend initial imaging with plain radiography followed by MRI. US may be useful in confirming the presence of a mass in doubtful cases or if MRI is unavailable. CT offers no distinct advantage over the combined use of plain radiography and MRI. Although angiography demonstrated the pathognomonic features in all six deeply situated lesions, because of its invasiveness it should be reserved chiefly for those patients undergoing surgical resection.     

脑实质内海绵状血管瘤的CT和MRI诊断

目的 探讨脑实质内海绵状血管瘤(CA)的CT和MRI表现，以提高对本病的认识。资料与方法 回顾性分析经手术病理证实的CAl4例。12例行CT平扫，10例行CT增强扫描；10例行MM检查，6例行Gd—DTPA增强扫描；9例同时行CT和MRI检查。结果 CA可发生于脑内任何部位，以单发病灶多见。12例CT平扫发现16个病灶，全部病灶均呈高密度或稍高密度，7个病灶可见钙化；10例CT增强扫描发现病灶14个，9个病灶无强化，5个病灶呈轻度强化。10例MRI检查发现13个病灶，3个在T1WI上是等信号，10个为高信号；在T2WI上全部病灶为高低混杂信号，其中9个病灶周围伴有环形低信号，大多数病灶周围无水肿带，无占位效应。结论 CA具有较典型的影像学表现，CT和MRI对病变的诊断具有重要意义，且MRI优于CT。正确诊断有赖于结合临床资料和影像学征象的综合分析。     

Computed Tomography and Magnetic Resonance Imaging Findings of Nasal Cavity Hemangiomas According to Histological Type

Objective

To compare computed tomography (CT) and magnetic resonance imaging (MRI) findings between two histological types of nasal hemangiomas (cavernous hemangioma and capillary or lobular capillary hemangioma).

Materials and Methods

CT (n = 20; six pre-contrast; 20 post-enhancement) and MRI (n = 7) images from 23 patients (16 men and seven women; mean age, 43 years; range, 13-73 years) with a pathologically diagnosed nasal cavity hemangioma (17 capillary and lobular capillary hemangiomas and six cavernous hemangiomas) were reviewed, focusing on lesion location, size, origin, contour, enhancement pattern, attenuation or signal intensity (SI), and bony changes.

Results

The 17 capillary and lobular hemangiomas averaged 13 mm (range, 4-37 mm) in size, and most (n = 13) were round. Fourteen capillary hemangiomas had marked or moderate early phase enhancement on CT, which dissipated during the delayed phase. Four capillary hemangiomas on MRI showed marked enhancement. Bony changes were usually not seen on CT or MRI (seen on five cases, 29.4%). Half of the lesions (2/4) had low SI on T1-weighted MRI images and heterogeneously high SI with signal voids on T2-weighted images. The six cavernous hemangiomas were larger than the capillary type (mean, 20.5 mm; range, 10-39 mm) and most had lobulating contours (n = 4), with characteristic enhancement patterns (three centripetal and three multifocal nodular), bony remodeling (n = 4, 66.7%), and mild to moderate heterogeneous enhancement during the early and delayed phases.

Conclusion

CT and MRI findings are different between the two histological types of nasal hemangiomas, particularly in the enhancement pattern and size, which can assist in preoperative diagnosis and planning of surgical tumor excision.     

原发性纵隔囊肿的影像学表现

目的分析纵隔囊肿的影像学特点，提高对不同类型囊肿不典型表现的认识和诊断水平。方法回顾性分析经手术病理证实的44例纵隔囊肿的CT和（或）MRI资料（其中28和26例分别行CT和MR检查，10例同时行CT和MR检查），分析其影像学表现。结果囊肿位于前、中、后纵隔者分别为13、18和11例，位于前中纵隔者2例。支气管囊肿和心包囊肿位于不典型部位者分别为7和5例。CT密度近似于水者12例，占42．9％（12／28）。MR T2WI病变均为等或高于脑脊液的长T2信号，1例水成像上信号有衰减。近似于脑脊液的长T1信号者8例，占30．8％（8／26）。MRI信号不均匀者5例，原因各异。误诊14例。结论后纵隔和前纵隔CT高密度和厚壁的囊肿易被误诊为肿瘤性病变；中纵隔气管旁的心包囊肿易被误诊为支气管囊肿。MRI有助于诊断CT高密度的纵隔囊肿。MRI信号不均匀或水成像上信号衰减足误诊的原因。     

眼球脉络膜血管瘤的影像学表现

目的：探讨眼球脉络膜血管瘤的CT、MRI表现及其诊断、鉴别诊断价值。方法：回顾性分析9例经病理（3例）和临床证实（6例）的脉络膜血管瘤。CT扫描6例，MR检查4例，9例均行B超检查，3例作了眼底荧光血管造影。结果：2例CT平扫示眼球后极球壁轻度或新月形增厚，与球壁呈等密度，5例（1例平扫＋增强）增强示眼球后极部高密度梭形或扁平状隆起均匀肿块，瘤体强化明显。与玻璃体比较3例MR T1WI呈高信号，T2WI呈低信号，与视神经、眼外肌相比呈等信号；1例较小肿瘤辅以增强T1WI脂肪抑制技术被清楚显示。渗出性视网膜脱离在T1WI、T2WI上均呈中、高信号；增强T1WI瘤体显著强化，边界清晰，且信号均匀。B超检查8例为实质不均质肿块占位，1例为均质肿块占位，9例均探及视网膜脱离光带。结论：CT＋MRI＋B超检查对脉络膜血管瘤可得到较为全面的影像学诊断资料，MRI在该病的诊断及鉴别诊断中较CT及B超更具敏感性和特异性。     

Characterization of focal hepatic lesions with ferumoxides-enhanced T2-weighted MR imaging

OBJECTIVE: The purpose of this study was to evaluate whether ferumoxides-enhanced MR imaging of focal hepatic lesions provides distinctive signal intensity and lesion-to-liver contrast changes for benign and malignant lesions, helping to further characterize and differentiate these lesions. MATERIALS AND METHODS: Data analysis was performed on 70 patients, with previously identified focal hepatic lesions, who underwent MR imaging of the liver before and after IV administration of ferumoxides (10 micromol Fe/kg). Lesions analyzed with pathologically proven diagnoses included metastases (n = 40), hepatocellular carcinoma (n = 11), cholangiocarcinoma (n = 6), hemangioma (n = 4), focal nodular hyperplasia (n = 6), and hepatocellular adenoma (n = 3). Response variables measured and statistically compared included the percentage of signal-intensity change and lesion-to-liver contrast. RESULTS: Focal nodular hyperplasia showed significant signal intensity loss on ferumoxides-enhanced T2-weighted images (mean, -43%+/-6.7%, p < 0.01). All other lesion groups showed no statistically significant change in signal intensity on ferumoxides-enhanced T2-weighted images, although signal intensity loss was seen in some individual hepatocellular adenomas (mean, -6.6%+/-24.0%) and hepatocellular carcinomas (mean, -3.3%+/-10.3%). All lesions, with the exception of hepatocellular carcinoma, had a marked increase in lesion-to-liver contrast on ferumoxides-enhanced T2-weighted images, which was statistically significant for metastases and hemangioma (p < 0.02). CONCLUSION: Focal nodular hyperplasia shows significant decrease in signal intensity on ferumoxides-enhanced T2-weighted images, which may aid in the differentiation of focal nodular hyperplasia from other focal hepatic lesions. Other lesions, namely, hepatocellular adenoma and carcinoma, can have reticuloendothelial uptake, but usually to a lesser degree than that of focal nodular hyperplasia.     

骨母细胞瘤的CT和MRI诊断(附12例报告)

目的探讨CT及MR对骨母细胞瘤的诊断价值,提高对本病的认识。方法回顾分析经病理学证实的12例骨母细胞瘤的临床、CT、MR I及病理学资料。结果(1)行CT检查6例,均表现为膨胀性溶骨性破坏区伴随不同程度的钙化或骨化,瘤灶边缘呈反应性骨硬化缘,边缘光整。(2)行MR I扫描10例(包括4例已做CT检查的病人),表现为膨胀性的骨改变,瘤灶信号混杂,内有分隔,T1W I呈略低或等信号,T2W I呈高信号9例,1例以低信号为主。其中8例瘤灶周边可见清楚的T1、T2低信号缘,2例邻近组织呈片状模糊高信号。(3)增强扫描均呈中度以上强化,内夹杂片状低信号不强化区。结论骨母细胞瘤有较为典型的CT表现,MR I表现缺乏特征性。