Arteriovenous malformations (AVMs) are generally considered congenital vascular anomalies, whereas postoperative iatrogenic AVMs and arteriovenous fistulas (AVFs) are rare. In colorectal surgery, newly detected aneurysm-like mesenteric vascular lesions during postoperative surveillance may be difficult to distinguish from aneurysms, pseudoaneurysms, AVMs, and AVFs.
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