A subtype of the human papillomavirus (HPV) which is less common in the airway than the more common subtypes 6 and 11. HPV 18 is associated with a higher risk of cancer formation, along with HPV subtypes 16, 31, 45, 55, and others.
Papillomas seen (1 of 4)
Middle-aged man with chronic hoarseness and the lesions seen here, diagnosed by the pathologist as papillomas.
Stippled vascularity (2 of 4)
Closer view. Stippled vascular markings consistent with HPV effect are seen more clearly here.