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Coronal reformatted image from noncontrast sinus CT demonstrates the measurements of NSD. The midline is defined by a dashed line extending from the crista galli to the nasal crest. NSD severity (solid line) is measured to the point of maximal NSD orthogonal to the midline. NSD height is determined by measuring the distance from the point of maximal NSD to the floor of the nasal cavity parallel to the midline (dotted line).
