Meningeal myelomatosis: CT and MR appearances.

Meningeal myelomatosis is a rare feature of multiple myeloma. We report a case of IgG-kappa myeloma presenting as bilateral intracranial extraaxial masses.     

脾脏错构瘤的CT和MRI表现

目的:探讨脾脏错构瘤(SH)的CT和MRI表现.方法:回顾性分析6例病理确诊的SH患者的CT和MRI影像学表现.结果:6例SH中5例为单发,1例为多发.病灶在CT平扫呈等或稍低密度,在T1WI上呈等或稍低信号,在T2WI上呈不均匀低信号(4例)或高信号(2例),其中2例病灶中心出现局灶异常信号.动态增强扫描4例病灶表现为早期弥漫不均匀轻度强化并随时间推移呈渐进性延迟性强化,2例表现为早期均匀较明显强化,2例病灶中心的局灶异常信号呈部分延迟强化.结论:SH的CT和MRI表现具有一定特征性,影像学检查特别是MRI是诊断SH的重要方法.     

CT and MR findings of splenic angiosarcoma.

A surgically confirmed primary splenic angiosarcoma is described. Although angiography showed most of the characteristic findings of the present patient, MR imaging provided a useful information as a supplemental tool. The tumor demonstrated low-signal intensity on both T1- and T2-weighted images, which might differ from hemangioma findings. Subacute hemorrhage within the tumor was revealed by MR imaging, suggesting the way in which the tumor grew during a short period of time. This finding was different from reported angiosarcoma MR findings of siderotic nodules within the tumor. After the administration of Gd-DTPA, MR images clearly demonstrated heterogeneous enhancement within the tumor, which corresponded to the pathologic findings of solid parenchyma with necrotic tissues.     

脾脏错构瘤的影像学表现分析

目的探讨脾脏错构瘤的影像学特点,提高对本病的诊断水平。方法回顾性分析10例经病理证实的错构瘤的影像学表现。结果本组脾脏错构瘤9例为单发病灶,1例为多发。.肿瘤体积较大,最大直径为4.5cm导致脾脏局部形态失常。CT扫描脾脏错构瘤为等或稍低密度。磁共振扫描肿块在T1WI及T2WI序列为等或稍低。DWI序列以低信号为主。增强扫描,肿瘤多呈明显、持续性强化,延时后与脾脏实质密度或信号相仿。结论脾脏错构瘤的CT及磁共振扫描具有一定的典型性表现,尤其是磁共振T1WI、T2WI及DWI序列并结合增强扫描,可以与其他脾脏病变区别。     

腹膜后局限型Castleman病的CT及MR表现

目的：分析腹膜后局限型Castleman病的影像学特征,并参考病理分型,提高对该疾病的认识。方法回顾性分析经手术病理证实的10例患者的影像学资料,10例均行CT平扫及增强扫描,5例行MR平扫及增强扫描,分析其影像学表现并总结其特征。结果本组病变病理包括透明血管型8例和浆细胞型2例。CT平扫为等密度病灶,4例伴有钙化,1例伴有囊变,CT增强扫描示7例透明血管型病灶有明显持续强化,1例透明血管型病变与2例浆细胞型病灶呈轻度中度强化。5例行MR扫描,4例为透明血管型,1例为浆细胞型。平扫T1WI呈等或略低信号、T2WI呈高信号,DWI均为较高信号,增强扫描5例均有明显持续强化。结论腹膜后局限型Castleman病以透明血管型居多,影像学表现与病理分型密切相关,透明血管型明显持续强化,且钙化常见,而浆细胞型无明显特异性。     

Degenerative thalamic hamartoma: CT and MR imaging features

We describe hamartomas of possible thalamic origin. CT revealed marked calcification in the mass lesion, and MR imaging revealed contrast enhancement. Histologically, outgrowth of the glia was observed, but no neoplastic component was confirmed. Immunohistochemical staining was positive for the cell-adhesion factor N-CAM and negative for polysialic acid.     

CT and MR appearances of parotid pseudotumors in Sj?gren syndrome.

The radiologic findings in eight patients with parotid pseudotumors associated with Sj?gren syndrome (CT in eight; MRI in two) were retrospectively analyzed and compared with the findings in three cases with malignant lymphomas. Diagnosis of pseudotumor was obtained by surgery in six cases and by fine-needle aspiration biopsy and radiologic follow-up in the remaining cases. Six cases (75%) had advanced disease and the remaining had early disease. Both solid (75%) and cystic (38%) masses were seen in the patients with pseudotumors. The masses were solitary in 25%, multiple in 75%, unilateral in 25%, and bilateral in 75%. All three lymphomas were solid masses. The lymphomatous masses were not reliably distinguished from the solid pseudotumors.     

Stromal predominant type mesenchymal hamartoma of liver: CT and MR features.

Mesenchymal hamartoma is a rare pediatric liver tumor. The tumor is mainly cystic but occasionally a solid component is seen. Therefore the tumor can be divided into two forms: (a) cystic predominant, and (b) stromal predominant. In this report, CT and MR features of stromal predominant type mesenchymal hamartoma are presented.     

脾脏错构瘤的CT及MRI诊断(附6例报告)

目的 探讨脾脏错构瘤(SH)的CT和MRI特征,以提高对这种罕见病变的认识.方法 搜集经手术病理证实的SH 6例,其中4例同时行CT和MRI检查,单独行CT或MRI检查的各1例,回顾性分析其CT和MRI表现及特点.结果 单发5例,多发1例.CT平扫呈稍低密度4例、等密度1例;MRI成像T1 WI呈低信号1例、等信号4例,T2 WI呈低信号3例、等或高信号各1例.动态增强扫描,表现为早期不均匀轻度强化并随着时间推移呈渐进性延迟强化和早期不均匀明显强化、静脉期持续强化的病灶各3例,延迟期上述病灶均接近或稍高于脾实质密度(信号).结论 SH的CT和MRI表现具有一定的特征性,尤其是MRI的T2 WI,对SH的诊断具有较高的价值.     

Lingual hamartoma in an infant: CT and MR imaging

Lingual hamartoma is a rare tongue mass, primarily diagnosed in childhood. In most cases in the literature, the masses were surgically removed without preoperative imaging. There are only 3 cases reported in the clinical literature that describe preoperative imaging findings. We report the clinical and imaging findings in an infant with lingual hamartoma and review the literature.     

CT appearances of rounded atelectasis.

Five patients examined with CT had lesions fulfilling criteria for a diagnosis of rounded atelectasis (RA) and these were managed without biopsy. In three patients unsuspected contralateral lesions were identified as RA variants, and one of these was biopsied at thoracotomy and proved to be benign. All patients remain well at 6-22 months follow-up. We concur with recent reports that there is a spectrum of CT appearances of RA and that even atypical lesions seldom need further investigation. We also suggest that the appearances of some atypical lesions add support for the fibrosing theory of pathogenesis of RA.     

MR, CT, and ultrasonographic demonstration of splenic vein thrombosis

The first case report of magnetic resonance imaging of splenic vein thrombosis is presented together with CT and ultrasound correlation.     

The computed tomographic appearances of benign hepatic hamartoma

The case of a 32-year-old female with asymptomatic hepatomegaly due to a large cystic liver mass is described. Pathological examination after total excision revealed a benign hepatic hamartoma. Benign hepatic hamartoma is a rare cause of a cystic liver mass, usually occurring below the age of 5 years. The computed tomography findings included 'daughter cysts' and it is emphasised that these must not be regarded as pathognomonic of hydatid disease.     

Azygos continuation syndrome with aneurysm of the azygos vein: CT and MR appearances

We present a case of azygos vein continuation with aneurysm of the azygos vein simulating a tumor in the right upper mediastinum. The dynamic CT examination initially showed a structure of malignant appearance during the early arterial phase. Further dynamic CT revealed marked enhancement of the mass during the late venous phase, suggesting a vascular structure. Confirmation of diagnosis was made by MRI using a fast gradient echo imaging technique in cine mode, showing turbulent flow in the azygos aneurysm, and contrast-enhanced MR angiography, demonstrating a dilated azygos vein. Dynamic CT has a potential pitfall in the diagnosis of vascular structures.