Intramuscular vascular malformations of an extremity: findings on MR imaging and pathologic correlation |
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Authors: | Eung Yeop Kim J M Ahn Hye-Kyung Yoon Yeon-Lim Suh Young Soo Do Seung Hoon Kim Sung Wook Choo In-Wook Choo Sung Moon Kim Heung Sik Kang |
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Institution: | (1) Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50, Ilwon-Dong, Kangnam-Ku, Seoul 135–710, Korea, KR;(2) Department of Diagnostic Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, 50, Ilwon-Dong, Kangnam-Ku, Seoul 135–710, Korea, KR;(3) Department of Radiology, Asan Medical Center, College of Medicine, University of Ulsan, 388–1, Poongnap-Dong, Songpa-Gu, Seoul 138–736, Korea, KR;(4) Department of Radiology, Seoul National University College of Medicine, 28, Yongon-Dong, Chongno-Gu, Seoul 110–744, Korea, KR |
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Abstract: | Objective. To analyze the findings of intramuscular vascular malformations of an extremity on MR imaging and to correlate these findings
with histopathologic examination.
Design and patients. The findings on MR imaging and the medical records of 14 patients with an intramuscular vascular malformation of the extremity
were retrospectively studied. All patients underwent surgical excision. Diagnoses were based on the results of pathologic
examination. Findings on MR imaging were noted and correlated with the histopathologic findings.
Results. Intramuscular vascular malformations of an extremity showed multi-septate, honeycomb, or mixed appearance on MR imaging.
Multi-septate areas correlated with dilated and communicating vascular spaces with flattened endothelium. Honeycomb areas
corresponded to vascular spaces with inconspicuous small lumina and thickened vascular walls. Areas of increased signal intensity
on T2-weighted images were found in all intramuscular vascular malformations. Infiltrative margins were more commonly seen
in intramuscular lymphaticovenous malformations. Adherence to neurovascular structures and orientation of the lesion along
the long axis of the affected muscle were more commonly seen in intramuscular venous malformations.
Conclusions. Intramuscular vascular malformations showed either a multi-septate, honeycomb, or mixed appearance, reflecting the size of
the vascular spaces and the thickness of the smooth muscles of the vessel walls. Prediction of the subtype of an intramuscular
vascular malformation of an extremity on MR imaging seems to be difficult, although there are associated findings that may
be helpful in the differential diagnosis of each subtype.
Received: 19 January 1999 Revision requested: 4 May 1999 Revision received: 23 June 1999 Accepted: 29 June 1999 |
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Keywords: | Congenital vascular malformation Extremity MR imaging |
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