Aneurysmal bone cyst-plus: a diagnostic enigma.

Aneurysmal bone cyst, commonly reported in the second and third decades of life, is characterized by a rapid growth pattern with resultant bony expansion and facial asymmetry. Interestingly, these lesions can occur in association with other primary bone pathologies, where they are referred to as "hybrid lesions" or "ABC-Plus." Their rarity, especially in the head and neck region, may pose a diagnostic challenge to clinicians. Following is a discussion of one such enigmatic lesion that includes description of a unique case of ABC-Plus that affected the right mandible of a young male.