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MRI of a 17-year-old male patient (same patient as shown in Figure 5 for CT) with coronal view for contrast-enhanced T1-weighted (A); coronal FLAIR (B); and axial CISS sequences (C). Note the complete obstruction of the mastoidal cells on the right side (arrow) as seen on the contrast-enhanced T1-weighted sequence (A) with discrete contrast enrichment of the mastoidal system. Total fluid obstruction is also demonstrated on FLAIR (B) and CISS sequences (C).
