Melkersson-Rosenthal syndrome.

The Melkersson-Rosenthal syndrome (MRS) is a rare condition characterized by the triad of familial relapsing peripheral facial palsy, facial edema, and lingua plicata. Within a well-documented family aggregate of MRS, an index case simultaneously demonstrated all the elements of the triad, as well as gingival changes similar to those of cheilitis granulomatosa. When the incomplete or oligosymptomatic forms are considered, the MRS may be more common than previously thought.