First reported case of <i>Capnocytophaga canimorsus</i> pituitary abscess

This case is the first to implicate <i>C. canimorsus</i> in the formation of a pituitary abscess, expanding the spectrum of its potential clinical presentations. It underscores the diagnostic limitations of conventional microbiological techniques in deep-seated intracranial infections and supports the role of 16S rRNA PCR as a critical adjunct when routine cultures are negative. Clinicians should maintain a high index of suspicion for atypical pathogens in sellar lesions and consider molecular diagnostics early, particularly when histopathology reveals inflammatory features suggestive of infection without an identifiable organism.