caa a22 4500 605492859 CHVBK 20210128100517.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00261-014-0319-2 doi (NATIONALLICENCE)springer-10.1007/s00261-014-0319-2 Retroperitoneal low-flow vascular malformations: characteristic MRI findings correlated with histopathological findings [Elektronische Daten] [Hirotaka Akita, Yoshitake Yamada, Yoshiaki Ito, Shuji Mikami, Hiroaki Sugiura, Shigeo Okuda, Masahiro Jinzaki] 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. Springer Science+Business Media New York, 2014 Retroperitoneal low-flow vascular malformation nationallicence Breath-hold T2-weighted single-shot fast spin-echo image nationallicence Phantom sign nationallicence Centripetal filling pattern nationallicence Akita Hirotaka Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut Yamada Yoshitake Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut Ito Yoshiaki Department of Radiology, National Hospital Organization Tokyo Medical Center, 2-5-1, Higashigaoka, Meguro-ku, 152-8902, Tokyo, Japan aut Mikami Shuji Division of Diagnostic Pathology, Keio University Hospital, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut Sugiura Hiroaki Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut Okuda Shigeo Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut Jinzaki Masahiro Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut Abdominal Imaging Springer US; http://www.springer-ny.com 40/6(2015-08-01), 1713-1720 0942-8925 40:6<1713 2015 40 261 https://doi.org/10.1007/s00261-014-0319-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00261-014-0319-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Akita Hirotaka Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut NATIONALLICENCE 700 1- Yamada Yoshitake Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut NATIONALLICENCE 700 1- Ito Yoshiaki Department of Radiology, National Hospital Organization Tokyo Medical Center, 2-5-1, Higashigaoka, Meguro-ku, 152-8902, Tokyo, Japan aut NATIONALLICENCE 700 1- Mikami Shuji Division of Diagnostic Pathology, Keio University Hospital, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut NATIONALLICENCE 700 1- Sugiura Hiroaki Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut NATIONALLICENCE 700 1- Okuda Shigeo Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut NATIONALLICENCE 700 1- Jinzaki Masahiro Department of Diagnostic Radiology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, 160-8582, Tokyo, Japan aut NATIONALLICENCE 773 0- Abdominal Imaging Springer US; http://www.springer-ny.com 40/6(2015-08-01), 1713-1720 0942-8925 40:6<1713 2015 40 261