▶️In children the diagnosis can be confirmed with upright plain film. CT requires placing the patient supine which may exacerbate inspiratory strider
▶️In adults, the diagnosis may not be suspected clinically so patients may end up with a CT scan as in this case
▶️Bacterial infection typically 2/2 H. Influenza in unvaccinated children
▶️In adults, possible pathogens include Strep, Staph, and H. influ
▶️CT shows emphysematous swelling of the epiglottis and marked thickening of the aryepiglottic folds (arrows 2nd image). The aryepiglottic folds delineate the anteromedial borders of the pyriform sinus
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▶️Initial non-con CT shows a 3cm hyperdense lobulated extra-axial mass in the expected region of the left MCA bifurcation, consistent with a giant aneurysm. There are associated peripheral calcifications
▶️ What is the cause of the surrounding hypodensity?
▶️Prospectively this mass was thought to be an embryonal tumor w/ multilayered rosettes given the marked diffusion restriction, hemorrhage, and lack of surrounding edema 🧠
Imaging:
▶️T2 shows a heterogenous slightly hyperintense mass w/ areas of hypointensity
▶️No surrounding edema/infiltrating tumor is seen on T2/FLAIR
▶️Fluid-fluid level is seen suggestive of hemorrhage (arrow)
Brain radiation is a risk factor for the development of meningiomas …this patient subsequently developed multiple meningiomas including this large frontal meningioma
The mass was treated and immediate post op CT shows expected post op change with the resection cavity, some hemorrhage, and pneumocephalus
▶️Initial head CT shows subarachnoid hemorrhage centered in the right cerebellopontine angle cistern
▶️CTA confirms an aneurysm of the right anterior inferior cerebellar artery (AICA)
▶️MR displays and ice cream shaped enhancing mass extending through the right internal auditory canal into the cerebellopontine angle cistern, consistent with a vestibular schwannoma #icecream
▶️Careful search into the history confirms the schwannoma was treated with radiation