Gli autori riportano due casi di decorso infraottico di A1 associati ad aneurismi del poligono di Willis. L'anomalia fu diagnosticata dopo esame angiografico cerebrale eseguito in seguito ad emorragia subaracnoidea in ambedue i casi. Si sottolinea l'importanza della diagnosi preoperatoria dell'anomalia nel caso di approccio chirurgico a lesioni neoplastiche o vascolari parasellari. Si sottolinea infine l'elevata incidenza di aneurismi del poligono di Willis in soggetti portatori di tale variante anatomica.
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