The “Andy Gump deformity” is a euphemism for an anterior mandibular defect that creates the appearance of an absent chin and lower lip and severely retrognathic lower jaw .
Most commonly, this defect is due to ablative head and neck cancer surgery; however, this deformity is also used to describe bilateral body fractures of the edentulous and atrophic mandible or a severely retrognathic mandible.
In all cases patients with this deformity are at risk for
airway compromise,
cosmetic embarrassment,
excessive drooling,
mastication difficulties,
speech impairment.
Reconstruction is difficult but has become more successful over time with improved surgical technology.
The namesake of this deformity is a cartoon character from the early 20th century.