Why should nasopharyngeal airway not be used if there are evidence of clear fluid?

A nasopharyngeal airway should not be used if there is evidence of clear fluid, as this may indicate a cerebrospinal fluid (CSF) leak, often associated with a skull fracture. Inserting a nasopharyngeal airway in such cases could introduce pathogens into the cranial cavity, increasing the risk of infection like meningitis. Additionally, it could exacerbate any existing injury or complicate the patient's condition. Therefore, alternative airway management strategies should be considered.