Retroperitoneal low-flow vascular malformations: characteristic MRI findings correlated with histopathological findings

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• 作者：Hirotaka Akita ; Yoshitake Yamada ; Yoshiaki Ito ; Shuji Mikami…
• 关键词：Retroperitoneal low ; flow vascular malformation ; Breath ; hold T2 ; weighted single ; shot fast spin ; echo image ; Phantom sign ; Centripetal filling pattern
• 刊名：Abdominal Imaging
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：40
• 期：6
• 页码：1713-1720
• 全文大小：1,789 KB
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• 作者单位：Hirotaka Akita (1)
  Yoshitake Yamada (1)
  Yoshiaki Ito (2)
  Shuji Mikami (3)
  Hiroaki Sugiura (1)
  Shigeo Okuda (1)
  Masahiro Jinzaki (1)
  
  1. Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan
  2. Department of Radiology, National Hospital Organization Tokyo Medical Center, 2-5-1, Higashigaoka, Meguro-ku, Tokyo, 152-8902, Japan
  3. Division of Diagnostic Pathology, Keio University Hospital, 35 Shinanomachi, Shinjuku-ku, Tokyo, 160-8582, Japan
  
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Imaging and Radiology
  Gastroenterology
  Hepatology
  
• 出版者：Springer New York
• ISSN：1432-0509

文摘

Purpose: To evaluate the MRI findings of retroperitoneal low-flow vascular malformations (RLVMs) correlated with histopathological findings. Methods: Two radiologists reviewed the MRI findings of 4 RLVMs (3 with capillary malformations and 1 with a venous malformation). First, they evaluated the visibility, signal intensities, and signal homogeneity of each lesion on non-fat-suppressed breath-hold T2-weighted single-shot fast spin-echo (non-FS SSFSE) images and fat-suppressed T2-weighted fast spin-echo (FS T2-weighted FSE) images. Second, the kinetic patterns and the internal enhancement patterns were analyzed for each lesion on multi-phasic contrast-enhanced (CE) images. After these image analyses, the MRI findings were correlated with the histopathological findings. Result: Histopathologically, the 4 RLVMs did not exhibit remarkable degeneration and were present in the retroperitoneal fat tissue without clear capsules. On the non-FS SSFSE images, 3 of the 4 RLVMs could not be discriminated from the surrounding retroperitoneal fat tissue (invisible), and the remaining lesion was barely visible with an indistinct margin. On the FS T2-weighted FSE images, however, all the RLVMs were clearly visualized as homogeneous high-signal intensities. On the multi-phasic CE images, all the capillary malformations exhibited fast enhancement, while a venous malformation showed slow enhancement. Furthermore, the RLVMs tended to exhibit a centripetal filling pattern. Conclusion: The RLVMs blended in with the surrounding retroperitoneal fat tissue on non-FS SSFSE images, like phantoms, whereas they were clearly visualized on FS T2-weighted FSE images. On multi-phasic CE images, the RLVMs tended to exhibit a centripetal filling pattern. These imaging features may be useful diagnostic clues for RLVMs.