Fig. 1

MR imaging findings of juvenile nasopharyngeal angiofibroma (JNA) in a 16-year-old male with nasal obstruction and recurrent epistaxis from the right nostril and vision impairment from the right eye. At axial T2-weighted images (A) JNA shows intermediate-to-high heterogeneous signal with serpentine flow voids (arrows) and degenerative cystic components (asterisks). At axial DWI (B), JNA does not present a high signal. At axial non-contrast T1-weighted images (C), JNA is predominantly isointense, with intense and heterogeneous enhancement after contrast injection (D). Note that some small intratumoral vessels are evidenced after contrast injection (arrow in D)