PMC7154244_01
Brain magnetic resonance imaging and computed tomography angiography findings on hospital day 10. a T1-enhanced magnetic resonance image showed a filling defect and perilesional enhancement suggesting cavernous thrombosis and thrombophlebitis in the cavernous sinus. b Gradient echo image revealed a subarachnoid hemorrhage in the posterior fossa. c A 1.1-cm posterior communicating artery aneurysm was observed on computed tomography angiography.
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F1
A 1.1-cm aneurysm was found in the posterior communicating artery, which was not detected by MRA at admission (Fig. 1).
Red bacterial growth in thioglycolate broth after incubation for 10 days.
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F2
The third CSF culture revealed no growth after 3 days, but after 10 days, red bacterial growth of gram-negative rods was observed in thioglycolate broth (Fig. 2). 16S rRNA gene sequencing in the isolate was performed using PCR according to a published method, and the results identified the isolate as Prevotella intermedia, revealing 99.05% identity (1,352/1,365 bp) with P. intermedia ATCC 25611T (GenBank accession number CP019301).