[Primary aneurysmal bone cyst of the maxillary sinus].

This case report describes a primary aneurysmal bone cyst in the maxillary sinus of a 50-year-old woman. She had nonspecific symptoms through four years of tearing, muscle tension in the face and neck as well as a sense of altered sound of speech. A magnetic resonance imaging of the facial skeleton showed multiple cystic processes with liquid mirror in nearly all large cysts.