The “Phantom of the Opera” sign of craniofacial fibrous dysplasia with unilateral polyostotic involvement in McCune-Albright syndrome

Abstract

McCune-Albright syndrome is a very rare genetic disorder resulting from a sporadically occurring somatic \textit{GNAS} gene mutation. It is characterised by the association of: endocrinopathy (most commonly precocious puberty), polyostotic fibrous dysplasia, and cutaneous pigmentation with café-au-lait spots with edges resembling the coast of Maine. We present a case of McCune-Albright syndrome with unilateral polyostotic fibrous dysplasia including involvement of the skull and facial bones on one side resulting in an appearance on skeletal scintigraphy resembling the characteristic mask of the “Phantom of the Opera”.