Foreign bodies of the hypopharynx may result in serious complications several weeks after their removal. Persistent symptoms should alert the physician to continuing infection. Osteomyelitis of the cervical spine has been seen as a complication of a foreign body in the hypopharynx which had penetrated the posterior pharyngeal wall.
Bruce Hagadorn, Howard W. Smith, Robert S. Rosnagle. Cervical Spine OsteomyelitisSecondary to a Foreign Body in the Hypopharynx. Arch Otolaryngol. 1972;95(6):578–580. doi:10.1001/archotol.1972.00770080868014