Progression in size of an arterio-venous malformation
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Arteriovenous malformations are shunts between arteries and veins that form a nidus without any intervening capillary bed. Although a number of views have been put forth, the pathogenesis of arteriovenous malformations is largely unknown. Generally, arteriovenous malformations are considered to be congenital lesions that are present at the time of birth. The size, physical characters and nature of vascular feeders and draining vessels have been seen to remain essentially constant throughout life. We present a rare case of arteriovenous malformation in a female child which was not seen on the initial angiogram but formed over the years.

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