Ramani M, Reinhold C, Semelka R C, Siegelman E S, Liang L, Ascher S M, Brown J J, Eisen R N, Bret P M
Department of Diagnostic Radiology, Montreal General Hospital, McGill University, Quebec, Canada.
Radiology. 1997 Jan;202(1):166-72. doi: 10.1148/radiology.202.1.8988207.
To determine the magnetic resonance (MR) imaging features of splenic hemangiomas and hamartomas, including their pattern of dynamic contrast material enhancement.
The appearance of 28 lesions in 18 patients was retrospectively reviewed on T2-weighted images (16 patients), unenhanced T1-weighted images (18 patients), and dynamic contrast-enhanced T1-weighted images (17 patients). Seventeen of 23 hemangiomas and all five hamartomas were proved at pathologic examination.
Of the 22 hemangiomas imaged with T2-weighting, 19 were hyperintense, two were isointense, and one was hypointense relative to the spleen. Dynamic gadolinium-enhanced imaging demonstrated a progressive centripetal pattern of enhancement in 19 of 22 hemangiomas. On delayed images, 19 hemangiomas demonstrated uniform enhancement. Of the five hamartomas, four were imaged with T2-weighting; three were hyperintense and one was hypointense relative to the spleen. All hamartomas demonstrated diffuse heterogeneous enhancement on images obtained early after administration of contrast material and became more uniformly enhanced on delayed images.
Splenic hemangiomas showed signal intensity characteristics and enhancement patterns similar to those described for hepatic hemangiomas. Since these features have been shown to reliably distinguish hemangiomas from other benign and malignant liver lesions, it may be reasonable to consider without histologic verification that lesions in the spleen with these imaging features represent hemangiomas.
确定脾血管瘤和错构瘤的磁共振（MR）成像特征，包括其动态对比剂增强模式。
回顾性分析18例患者中28个病灶在T2加权图像（16例患者）、未增强T1加权图像（18例患者）及动态对比增强T1加权图像（17例患者）上的表现。23个血管瘤中的17个及所有5个错构瘤经病理检查证实。
在22个经T2加权成像的血管瘤中，相对于脾脏，19个呈高信号，2个呈等信号，1个呈低信号。动态钆增强成像显示22个血管瘤中有19个呈向心性渐进性强化模式。在延迟图像上，19个血管瘤呈均匀强化。5个错构瘤中，4个经T2加权成像；相对于脾脏，3个呈高信号，1个呈低信号。所有错构瘤在注射对比剂后早期图像上均表现为弥漫性不均匀强化，在延迟图像上强化更均匀。
脾血管瘤的信号强度特征和强化模式与肝血管瘤相似。由于这些特征已被证明能可靠地将血管瘤与其他肝脏良恶性病变区分开来，因此对于脾脏中具有这些成像特征的病变，在未经组织学证实的情况下考虑其为血管瘤可能是合理的。
