↵a The location of the black turbinates and the change in enhancement during multiple series are shown. Because a patient can demonstrate BT in >1 turbinate (ie, both the middle and inferior turbinates can show BT simultaneously), the total number of turbinates seen with BT is larger than the number of cases in each group.

↵b BT persists across all sequences but improves gradually.

↵c BT resolves on later sequences.