Odontogenic Brain Abscess in a Hereditary Haemorrhagic Telangiectasia (HHT) Patient: Case Report with a Comprehensive Literature Review

This is the first report of <i>Ca. Saccharibacteria</i> oral taxon 488 in a clinical sample and the first detection of any species from this phylum in a brain abscess, co-detected with <i>A. propionica,</i> consistent with its obligate epibiotic lifestyle. Our findings broaden the known microbial diversity associated with odontogenic brain abscesses and underscore the value of 16S rDNA NGS in characterising polymicrobial infections, particularly when fastidious or uncultivable organisms are involved.