ARTERIOVENOUS MALFORMATIONS
\ɑːtˈi͡əɹɪˌə͡ʊvnəs mˌalfɔːmˈe͡ɪʃənz], \ɑːtˈiəɹɪˌəʊvnəs mˌalfɔːmˈeɪʃənz], \ɑː_t_ˈiə_ɹ_ɪ__ˌəʊ_v_n_ə_s m_ˌa_l_f_ɔː_m_ˈeɪ_ʃ_ə_n_z]\
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Abnormal, tangled collections of dilated blood vessels that result from congenitally malformed vascular structures in which arterial afferents flow directly into venous efferents without the usual resistance of an intervening capillary bed. A common type is the congenital arteriovenous fistula (ARTERIOVENOUS FISTULA /congenital). For arteriovenous malformations in the brain, INTRACRANIAL ARTERIOVENOUS MALFORMATIONS is available. (From Merck Manual, 15th ed)
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