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- 발행기관 : Korean Radiological Society (검색결과 321 건)
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Myxoid Chondrosarcoma of the Sinonasal Cavity in a Child: a Case Report
Kim, Yeo Ju,Im, Soo Ah,Lim, Gye-Yeon,Chun, Ho Jong,Park, Hyun Jin,Kim, Min Sik,Choi, Yeong Jin The Korean Radiological Society 2007 KOREAN JOURNAL OF RADIOLOGY Vol.8 No.5
<P><B/></P><P>Chondrosarcomas are malignant tumors of cartilage that rarely involve the sinonasal region, and myxoid chondrosarcoma is a rare histologic variant of chondrosarcoma that usually occurs in the soft tissue of extremities. Although several case reports and results of small series of chondrosarcomas in the sinonasal region in children are available, myxoid type chondrosarcoma is extremely rare. We recently experienced a case of low grade myxoid chondrosarcoma involving the sinonasal cavity in a 10-year-old boy, and here we report its radiologic-pathologic findings. In this case, chondroid calcification on CT and septal and marginal enhancement on MRI suggested a chondrosarcoma. Whole body PET-CT demonstrated no definite metastatic lesion and a low peak standardized uptake value primary tumor. However, no definite distinguishing imaging features were observed that distinguished low grade myxoid chondrosarcoma from conventional chondrosarcoma.</P>
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Radiological Spectrum of Hepatic Mesenchymal Hamartoma in Children
Kim, Soung Hee,Kim, Woo Sun,Cheon, Jung-Eun,Yoon, Hye-Kyung,Kang, Gyeong Hoon,Kim, In-One,Yeon, Kyung Mo The Korean Radiological Society 2007 KOREAN JOURNAL OF RADIOLOGY Vol.8 No.6
<P><B>Objective</B></P><P>A hepatic mesenchymal hamartoma is an uncommon benign tumor in children and little is known about the spectrum of its radiological features. The purpose of this study is to describe the spectrum of radiological features of a hepatic mesenchymal hamartoma in children.</P><P><B>Materials and Methods</B></P><P>Thirteen children with a pathologically confirmed hepatic mesenchymal hamartoma (M:F = 7:6; mean age, 3 years 2 months) were included in our study. Ultrasonography (US) was performed in nine patients including color and power Doppler US (n = 7). CT scans were performed in all patients. We evaluated the imaging findings of the hepatic mesenchymal hamartomas and the corresponding pathological features.</P><P><B>Results</B></P><P>Each patient had a single tumor (mean diameter: 13 cm [1.8-20 cm]). On CT and/or US, four patients (31%) had a 'multiseptated cystic tumor', five patients (38%) had a 'mixed solid and cystic tumor', and four patients (31%) had a 'solid tumor.' The septa of the cystic portion were thin in the multiseptated cystic tumors and irregularly thick in the mixed solid and cystic tumors as seen on US. On a post-contrast CT scan, solid portions or thick septa of the tumors showed heterogeneous enhancement. The amount of hepatocytes was significantly different among the three tumor groups according to the imaging spectrum (<I>p</I> = 0.042).</P><P><B>Conclusion</B></P><P>A hepatic mesenchymal hamartoma in children can show a wide spectrum of radiological features, from a multiseptated cystic tumor to a mixed solid and cystic tumor, and even a solid tumor.</P>
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Park, Ji Seon,Oh, Joo Hyeong,Kim, Deog Yoon,Park, Yong Koo,Park, Sang Joon,Kim, Soo Joong The Korean Radiological Society 2007 KOREAN JOURNAL OF RADIOLOGY Vol.8 No.2
<P><B>Objective</B></P><P>We wanted to evaluate the effectiveness of intraluminal irradiation with Holmium-166 (<SUP>166</SUP>Ho) for reducing the pseudointimal hyperplasia (PIH) in the transjugular intrahepatic portosystemic shunt (TIPS) tract in a swine model.</P><P><B>Materials and Methods</B></P><P>TIPS was performed in 12 domestic pigs, after the creation of portal hypertension by intraportal injection of a mixture of N-butyl-2-cyanoacrylate (NBCA) and lipiodol. Five pigs first underwent intraluminal irradiation (30 Gy) in the parenchymal tract with using a <SUP>166</SUP>Ho solution-filled balloon catheter, and this was followed by the placement of a nitinol stent in the TIPS tract. For the seven control pigs, the balloon was filled with saline and contrast media mixture. Two weeks later, follow-up portography and histological analysis were performed.</P><P><B>Results</B></P><P>TIPS was successfully performed in all twelve pigs with achieving artificially induced portal hypertension. Portography performed two weeks after TIPS showed the patent tracts in the TIPS tracts that were irradiated with <SUP>166</SUP>Ho (5/5, 100%), whereas either completely (5/6, 83.3%) or partially (1/6, 16.7%) occluded TIPS were seen in the seven pigs of the nonirradiated control group, except in one pig that experienced periprocedural death due to bleeding. Histological analysis showed a statistically significant difference for the maximal PIH (irradiated: 32.8%, nonirradiated: 76.0%, <I>p</I> < 0.001) between the two groups.</P><P><B>Conclusion</B></P><P>Intraluminal irradiation with 30 Gy of <SUP>166</SUP>Ho for TIPS significantly improved the TIPS patency in a swine model of portal hypertension during a 2-week period of follow-up.</P>
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Lee, Hyun Ju,Goo, Jin Mo,Lee, Chang Hyun,Yoo, Chul-Gyu,Kim, Young Tae,Im, Jung-Gi The Korean Radiological Society 2007 KOREAN JOURNAL OF RADIOLOGY Vol.8 No.1
<P><B>Objective</B></P><P>To evaluate the inter-group differences in growth and the pathological results of nodular ground-glass opacities (GGOs) according to their size and focal solid portions.</P><P><B>Materials and Methods</B></P><P>Ninety-six nodular GGOs in 55 individuals followed by CT for at least one month from an initial chest CT were included. Forty nodular GGOs in 30 individuals were pathologically confirmed to be: adenocarcinoma (n = 15), bronchioloalveolar carcinoma (BAC) (n = 11), atypical adenomatous hyperplasia (AAH) (n = 8), focal interstitial fibrosis (n = 5) and aspergillosis (n = 1). Lesions were categorized based on high-resolution CT findings: pure nodular GGO (PNGGO) ≤ 10 mm, PNGGO > 10 mm, mixed nodular GGO (MNGGO)≤ 10 mm, and MNGGO > 10 mm. In each group, the change in size during the follow-up period, the pathological results and the rate of malignancy were evaluated.</P><P><B>Results</B></P><P>Three MNGGO lesions, and none of the PNGGO, grew during the follow-up period. Resected PNGGOs ≤ 10 mm were AAH (n = 6), BAC (n = 5), and focal interstitial fibrosis (n = 1). Resected PNGGOs > 10 mm were focal interstitial fibrosis (n = 4), AAH (n = 2), BAC (n = 2), and adenocarcinoma (n = 2). Resected MNGGOs ≤ 10 mm were adenocarcinoma (n = 2), and BAC (n = 1). Resected MNGGOs > 10 mm were adenocarcinoma (n = 11), BAC (n = 3), and aspergillosis (n = 1).</P><P><B>Conclusion</B></P><P>Mixed nodular GGOs (MNGGOs) had the potential for growth; most were pathologically adenocarcinoma or BAC. By contrast, PNGGOs were stable for several months to years; most were AAH, BAC, or focal interstitial fibrosis.</P>
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Jin, Gong Yong,Park, Sang Hee,Han, Young Min,Chung, Gyung Ho,Kwak, Hyo Sung,Jeon, Soo bin,Lee, Yong Chul The Korean Radiological Society 2006 KOREAN JOURNAL OF RADIOLOGY Vol.7 No.2
<P><B>Objective</B></P><P>To compare the effect of radio frequency ablation (RFA) on the dimensions of radio frequency coagulation necrosis in a rabbit lung using a wet electrode in monopolar mode with that in dual electrode bipolar mode at different infusion rates (15 mm/hr versus 30 ml/hr) and saline concentrations (0.9% normal versus 5.8% hypertonic saline).</P><P><B>Materials and Methods</B></P><P>Fifty ablation zones (one ablation zone in each rabbit) were produced in 50 rabbits using one or two 16-guage wet electrodes with a 1-cm active tip. The RFA system used in the monopolar and dual electrode wet bipolar RFA consisted of a 375-kHz generator (Elektrotom HiTT 106, Berchtold, Medizinelektronik, Germany). The power used was 30 watts and the exposure time was 5 minutes. The rabbits were assigned to one of five groups. Group A (n = 10) was infused with 0.9% NaCl used at a rate of 30 ml/hr in a monopolar mode. Groups B (n = 10) and C (n = 10) were infused with 0.9% NaCl at a rate of 15 and 30 ml/hr, respectively in dual electrode bipolar mode; groups D (n = 10) and E (n = 10) were infused with 5.8% NaCl at a rate of 15 and 30 ml/hr, respectively in a dual electrode bipolar mode. The dimensions of the ablation zones in the gross specimens from the groups were compared using one-way analysis of variance by means of the Scheffe test (post-hoc testing).</P><P><B>Results</B></P><P>The mean largest diameter of the ablation zones was larger in dual electrode bipolar mode (30.9±4.4 mm) than in monopolar mode (22.5±3.5 mm). The mean smallest diameter of the ablation zones was larger in dual electrode bipolar mode (22.3±2.5 mm) than in monopolar mode (19.5±3.5 mm). There were significant differences in the largest and smallest dimension between the monopolar (group A) and dual electrode wet bipolar mode (groups B-E). In dual electrode bipolar mode, the mean largest diameter of the ablation zones was larger at an infusion rate of 15 ml/hr (34.2±4.0 mm) than at 30 ml/hr (27.6±0.1 mm), and the mean smallest diameter of the ablation zones was larger at an infusion rate of 15 ml/hr (27.2±7.5 mm) than at an infusion rate of 30 ml/hr (24±2.9 mm).</P><P><B>Conclusion</B></P><P>Using a wet electrode, dual electrode bipolar RFA can create a larger ablation zone more efficiently than monopolar RFA.</P>
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Morton Neuroma: Evaluated with Ultrasonography and MR Imaging
Lee, Mi-Jung,Kim, Sungjun,Huh, Yong-Min,Song, Ho-Taek,Lee, Sung-Ah,Lee, Jin Woo,Suh, Jin-Suck The Korean Radiological Society 2007 KOREAN JOURNAL OF RADIOLOGY Vol.8 No.2
<P><B>Objective</B></P><P>The purpose of this study was to compare the diagnostic accuracy of both ultrasonography (US) and magnetic resonance imaging (MRI) for the assessment of Morton neuroma.</P><P><B>Materials and Methods</B></P><P>Our study group was comprised of 20 neuromas from 17 patients, and the neuromas were confirmed on surgery following evaluation with US, MRI, or both US and MRI. The diagnostic criterion for Morton neuroma, as examined by US, was the presence of a round or ovoid, well-defined, hypoechoic mass. The diagnostic criterion, based on MR imaging, was a well defined mass with intermediate to low signal intensity on both the T1- and T2-weighted images. The retrospective comparison between the sonographic and MR images was done by two experienced radiologists working in consensus with the surgical and pathologic correlations.</P><P><B>Results</B></P><P>The detection rate of Morton neuroma was 79% for 14 neuromas from 11 patients who had undergone US followed by an operation. The detection rate was 76% for 17 neuromas from 15 patients who had undergone MRI and a subsequent operation. The mean size of the examined neuromas was 4.9 mm on the US images and it was 5.1 mm on the MRI studies. Ten neuromas (71%) were 5 mm or less as measured by US, and three neuromas were not detected, whereas on the MRI analysis, 10 neuromas (59%) were 5 mm or less and four neuromas were not visualized. Among the patients examined during postoperative follow-up, symptoms were completely relieved in 85% and the symptoms were partially relieved in 15%.</P><P><B>Conclusion</B></P><P>US and MR imaging are comparable modalities with high detection rate for the evaluation of Morton neuroma.</P>
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