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MR images of bilateral AM with duration of symptoms of 12 days on the left and fewer than 6 days (3–6 days) on the right side. MR images of bilateral AM.

Published byAntony Sherman Modified over 5 years ago

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Presentation on theme: "MR images of bilateral AM with duration of symptoms of 12 days on the left and fewer than 6 days (3–6 days) on the right side. MR images of bilateral AM."— Presentation transcript:

1 MR images of bilateral AM with duration of symptoms of 12 days on the left and fewer than 6 days (3–6 days) on the right side. MR images of bilateral AM with duration of symptoms of 12 days on the left and fewer than 6 days (3–6 days) on the right side. T2 FSE image (A) shows total obliteration of middle ear and mastoid air spaces. SI is comparable with that of brain parenchyma. Especially on the right side, delineation of intramastoid bony septa is no longer detectable. On the left, outer cortical bone is destroyed (arrow) with subperiosteal abscess formation (asterisk). Intramastoid signal decrease, compared with CSF, becomes even more evident in CISS (B). In postgadolinium T1 MPRAGE (E), intense, thick enhancement surrounds the fluid-filled mastoid antra (a) and fills the peripheral mastoid cells. On the left, intense soft-tissue enhancement around the subperiosteal abscess and, on the right, periosteal enhancement surrounding the mastoid are visible. DWI b=1000 (C) and ADC (D) show diffusion restriction in the whole mastoid region bilaterally with foci of markedly elevated SI inside both antra (a) and the left subperiosteal abscess (asterisk). R. Saat et al. AJNR Am J Neuroradiol 2015;36: ©2015 by American Society of Neuroradiology

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