Cervical adenitis

Periodic fever, aphthous stomatitis, pharyngitis and adenitis syndrome is a medical condition, typically starting in young children, in which high fever occurs periodically at intervals of about 3–5 weeks, frequently accompanied by aphthous-like ulcers, pharyngitis and/or cervical adenitis (cervical lymphadenopathy). The syndrome was described in 1987 and named two years later. [Source: Wikipedia ]

May Cause
Atlantoaxial instability
May Be Caused by
Marshall syndrome