Introduction
Cervical necrotizing fasciitis (CNF) is a rapidly evolving and life-threatening condition. Therefore, it is important for physicians to evaluate the severity of illness and to predict clinical outcome exactly in the early phase. We focused on extension of acute fluid collection along the deep cervical space by CT findings. The purpose of this study was to produce the CT grade and to analyze whether our CT grade is related to the clinical features and the responses to treatment of CNF.