Fig. 4
From: MRI of acute neck infections: evidence summary and pictorial review
Diagnostic criteria for an abscess on MRI: axial T2-weighted (a), pre-contrast T1-weighted (c), fat-suppressed post-contrast T1-weighted (d) images, and an ADC map (b). A submandibular space odontogenic abscess (arrows) shows intermediate to high T2-signal (a), no enhancement after contrast injection (c, d), and restricted diffusion as indicated by low ADC values (b)