cindykron, this is from pub med--also search "Bow hunters syndrome" there Comment in: Neurology. 2004 Jun 8;62(11):2143; author reply 2144. Mechanical compression of the extracranial vertebral artery during neck rotation. * Sakaguchi M, * Kitagawa K, * Hougaku H, * Hashimoto H, * Nagai Y, * Yamagami H, * Ohtsuki T, * Oku N, * Hashikawa K, * Matsushita K, * Matsumoto M, * Hori M. Division of Stroke Research, Osaka University Graduate School of Medicine, Japan. Using duplex ultrasonography (US), the authors showed compression of the extracranial vertebral artery (ECVA) during neck rotation in 5.0% of 1,108 patients. Age (per 10-year increase, OR 0.80, 95% CI 0.67 to 0.96), vessel diameters (per 0.5-mm diameter increase, OR 0.63, 95% CI 0.51 to 0.79), and symptoms upon neck rotation (OR 4.01, 95% CI 1.35 to 11.9) were associated with vessel compression. In one case, SPECT revealed decreased cerebral perfusion of the hindbrain during rotation. ECVA US is useful in identifying vessel compression, especially in patients with symptoms on neck rotation. PMID: 14504337 [PubMed - indexed for MEDLINE]