椎管内硬膜外海绵状血管瘤的MR表现

目的 探讨椎管内硬膜外海绵状血管瘤R诊断价值。方法 回顾性分析3例经病理证实的椎管内硬膜外海绵状血管瘤的MR表现，并复习相关文献。结果 3例椎管内硬膜外海绵状血管瘤中，2例位于胸椎，1例位于颈胸椎。3例均沿脊椎纵轴生长，呈梭形或长条形；2例肿块“钳”状包绕，推挤相应水平的脊髓；3例均表现为T2WI高信号，钆喷替酸葡甲胺（Gd-DTPA)增强扫描呈均匀一致的明显强化；2例肿瘤侵犯，压迫相邻的椎间孔并使椎间孔扩大，且经椎间孔突出旁间隙，呈“哑铃状”外观。2例合并椎体血管瘤。结论 椎管内硬膜外海绵状血管是非常少见的椎管硬膜外肿瘤，MRI是诊断此病的最佳方法，并具有相对特征性表现。     

Spinal intradural capillary hemangioma: MR findings

We report a case of a spinal intradural capillary hemangioma. On MR images, a well-circumscribed intradural mass was detected at the T8-T9 level. The signal intensity of the mass relative to the spinal cord was isointense on T1-weighted images, hyperintense on T2-weighted images, and showed homogeneous, strong enhancement on contrast-enhanced T1-weighted images. The mass had both extramedullary and intramedullary components.     

Spinal intradural extramedullary capillary hemangioma: MR imaging findings

SUMMARY: Spinal intradural extramedullary capillary hemangiomas are extremely rare. We present the MR imaging and histologic findings in three patients with this abnormality. The three patients were men who had symptoms of either myelopathy (n = 2) or radiculopathy (n = 1). The tumors were well demarcated, 1.5-2.0 cm in diameter, and were located at the posterior or posterolateral portion of the thecal sac (one at the L1 level and the other two at the midthoracic level). On MR images, the tumor showed isointensity relative to the spinal cord on T1-weighted images, hyperintensity on T2-weighted images, and strong homogeneous enhancement on contrast-enhanced T1-weighted images in all three patients. In two patients, the dural tail sign was observed. Capillary hemangioma should be included in the differential diagnosis of a spinal intradural extramedullary tumor.     

Giant cavernous hemangioma of the liver: atypical CT and MR findings

The CT and MR appearance of giant cavernous hemangiomas can be confusing, and some atypical radiographic findings have been described. We report the CT and MR features of a giant cavernous hemangioma of the liver with atypical presentation. CT showed a large hypodense geographical lesion involving the majority of the liver and multiple scattered peripheral lesions. The T2-weighted MR images revealed a huge hyperintense lesion with multiple satellite nodules. Correspondence to: C. Valls     

Spinal intradural extramedullary cavernous hemangioma

Spinal intradural extramedullary cavernous hemangiomas are very rare. Mixed intensities on T1- andT2-weighted images due to repeated hemorrhages and poor to absent contrast-enhancement are the most common imaging features of the disease allowing accurate differentiation from the far more frequent meningiomas and schwannomas of similar location.     

Spinal MR findings in continuous epidural analgesia without infection

BACKGROUND AND PURPOSE: Spinal epidural abscesses are major complications of epidural anesthesia, and their MR features have been reported. In patients receiving continuous infusion via an epidural catheter, MR findings may mimic those of spinal epidural abscess in the absence of infection. The purpose of this study was to assess the spinal MR findings associated with continuous epidural anesthesia. METHODS: Spinal MR findings in five consecutive patients receiving continuous epidural anesthesia were retrospectively evaluated. Axial and sagittal T1- and T2-weighted spin-echo and contrast-enhanced fat-suppressed T1-weighted spin-echo images were obtained. Infection was ruled out on microbiologic analysis three patients and on follow-up in two. Each lesion was evaluated for its MR signal intensity, location, extent, delineation, and enhancement pattern. In three patients, follow-up MR imaging was performed within 5-150 days, and the images were compared. RESULTS: Posterior epidural lesions were identified in all five patients. The lesions were isointense to hypointense relative to the spinal cord on T1-weighted images, isointense relative to CSF on T2-weighted images, and well enhanced on enhanced T1-weighted images. The anomalous enhancement involved two to seven vertebral bodies. In one patient, the enhanced lesion slightly compressed the spinal cord. On follow-up MR imaging, the epidural lesions decreased in two patients and did not change in one. CONCLUSION: Continuous epidural anesthesia can result in MR findings similar to those of epidural abscess, even in the absence of infection.     

Spinal epidural extraskeletal Ewing sarcoma: MR findings in two cases

SUMMARY: We report the CT myelography and MR findings of two cases of extraskeletal Ewing sarcoma involving the spinal epidural and paravertebral spaces in a middle-aged man (case 1) and a young woman (case 2). In both cases CT myelography showed epidural and paravertebral masses on one side, with widening of the ipsilateral neural foramina at the C5-C6 level in case 1 and at the C7-T1 level in case 2. On MR images, the masses were isointense to muscle on T1-weighted images, hyperintense on T2-weighted images, and showed moderate enhancement on contrast-enhanced T1-weighted images. In one case, all pulse sequences showed linear signal voids, representing the vertebral artery encasement within the mass. The intradural component connected with the main mass was detected in the other case.     

MR imaging of orbital cavernous hemangioma

Four cases of biopsy proven orbital cavernous hemangioma were studied with magnetic resonance imaging. The hemangiomas were isointense with brain on T1-weighted spin echo (SE) images and well differentiated from adjacent structures due to intense signal from surrounding fat. The T2-weighted SE images of the hemangioma were of high signal intensity in comparison to the orbital fat. The use of surface receiving coils produced striking detail of all soft tissue structures especially on T1-weighted images.     

眶内海绵状血管瘤的MRI表现

 目的 探讨眶内海绵状血管瘤的MRI表现.方法 眶内海绵状血管瘤16例,男7例,女9例,年龄4～74岁,使用1.5T超导MRI,常规SE/VE序列,T1WI、T2WI,均注射Gd-DTPA.结果 MRI平扫表现:4例长T1长T2信号,8例等T1长T2信号,3例短T1长T2信号(压脂),1例等T1等T2信号;其中2例肿瘤内可见血管流空影.增强表现:7例呈明显均匀强化,5例呈中度略不均匀强化,4例分别为轻度强化、边缘强化及结节强化.结论 根据MRI眶内海绵状血管瘤的形态、信号、强化表现及好发年龄等特点综合分析可以做出定性诊断.     

Hepatocellular carcinoma: MR appearance mimicking cavernous hemangioma

A case of hepatocellular carcinoma is reported in which a calculated T2 value of the tumor was exceptionally long and differentiation from cavernous hemangioma based on T2 signal intensity was difficult. Pathologically, the mass consisted of dense, homogeneous acinar formation (pseudoglandular type). The T2 prolongation of the mass was probably due to abundant fluid in the acini.     

脑实质内海绵状血管瘤MRI表现

目的分析脑实质内海绵状血管瘤的MRI表现，提高本病的诊断水平。方法回顾分析18例经临床及手术病理证实脑实质内海绵状血管瘤的MRI影像表现。结果18例共26个病灶，表现为T1WI等信号、高信号、混杂信号或环状高信号，T2WI低信号、均匀高信号或环状高信号，周围可见低信号环；大部分病灶无占位效应及周围水肿，所有病灶在梯度回波（GRE）序列上均可见到病灶边缘低信号环；Gd—DTPA增强扫描部分病灶强化。结论海绵状血管瘤MRI表现较为特异，MRI检查是诊断脑实质内海绵状血管瘤最为敏感的方法。     

Spinal epidural hemangioma related to pregnancy

We report the case of a 39-year-old woman with adolescent idiopathic scoliosis presenting with myelopathy secondary to a spinal epidural hemangioma. MRI showed an epidural soft tissue mass within the spinal canal between T5 and T9 with severe spinal cord compression. Symptoms had a temporal relationship to her pregnancy. Surgical removal of the epidural hemangioma rapidly relieved her symptoms and neurologic deficits. Follow-up examination 2 years later demonstrated normal motor and sensory function, without any neurologic sequelae or progression of deformity. Received: 16 June 2000 Revision requested: 2 June 2000 Revision received: 13 September 2000 Accepted: 25 September 2000     

Lumbar epidural chordoma: MR findings

Chordomas derive from persistent nests of notochordal cells that do not regress. They usually arise from the midline within bone of the skull base or spinal column. Typical radiographic findings of chordomas include midline location and bony destruction. We report an unusual epidural chordoma of the lumbar spine.     

MRI对椎管内硬膜外海绵状血管瘤的诊断价值

目的:探讨发生在椎管内硬膜外的海绵状血管瘤MRI影像学特征,提高对该类病变的认识。方法:搜集2001年~2007年经手术病理证实的5例发生在椎管内硬膜外的海绵状血管瘤的患者资料,进行回顾性分析。结果:发生在椎管内硬膜外的海绵状血管瘤5例,T1WI呈均匀或不均匀低信号,T2WI呈均匀高信号,增强扫描瘤体明显均匀强化,2例病变轴位显示病灶跨过左侧椎间孔向椎管外"钳状"生长。其中1例相应椎体合并小血管瘤。结论:椎管内硬膜外海绵状血管瘤为少见肿瘤,MRI对椎管内海绵状血管瘤的定位及定性有着无可替代的优势,是目前最为可靠的术前检查手段,能充分显示病变与周围组织的关系,但最后确立诊断,仍须结合临床及完整的病理资料分析。     

Cavernous hemangioma of the cavernous sinus misdiagnosed as a meningioma: a case report and MR imaging findings

Cavernous hemangioma (CH) is a benign vascular malformation. Intracranial CH is generally localized as an intracranial–intraaxial and responsible for 5–13% of all intracranial vascular malformations. Intracranial–extraaxial CHs are rare rather than intracranial–intraaxial CHs. Clinical findings, imaging characteristics, and surgical approach of extraaxial CHs are rather different than intraaxial CHs. Diagnosing cavernous sinus CH preoperatively is very important, but its radiological differential diagnosis is quite difficult. In this study, we present magnetic resonance imaging findings of a 48-year-old male who was considered preoperatively to have meningioma but was diagnosed with cavernous sinus CH during surgery by pathological examination.