title: Parosteal aneurysmal bone cyst.
abstract: The incidence of aneurysmal bone cysts is 0.14 cases per 100,000 individuals. Parosteal aneurysmal bone cysts are the least prevalent subtype and represent 7% of all aneurysmal bone cysts. We present the case of a 38-year-old male patient with pain and bulging in his right arm for eight months. He had previously been diagnosed as presenting giant-cell tumor, but his slides were reviewed and his condition was then diagnosed as parosteal aneurysmal bone cyst. The patient was treated with corticosteroid and calcitonin infiltration into the lesion and evolved with clinical and radiological improvement within the first five weeks after the operation.
authors.affiliation: Instituto Nacional de Traumatologia e Ortopedia (Into), Rio de Janeiro, RJ, Brazil.
authors.forename: Walter
authors.initials: W
authors.lastname: Meohas
authors.affiliation: Instituto Nacional de Traumatologia e Ortopedia (Into), Rio de Janeiro, RJ, Brazil.
authors.forename: Ana Cristina
authors.initials: AC
authors.lastname: de Sá Lopes
authors.affiliation: Instituto Nacional de Traumatologia e Ortopedia (Into), Rio de Janeiro, RJ, Brazil.
authors.forename: João Victor
authors.initials: JV
authors.lastname: da Silveira Möller
authors.affiliation: Instituto Nacional de Traumatologia e Ortopedia (Into), Rio de Janeiro, RJ, Brazil.
authors.forename: Luma Duarte
authors.initials: LD
authors.lastname: Barbosa
authors.affiliation: Instituto Nacional de Traumatologia e Ortopedia (Into), Rio de Janeiro, RJ, Brazil.
authors.forename: Marcelo Bragança Dos Reis
authors.initials: MB
authors.lastname: Oliveira
keywords: Aneurysmal bone cyst; Calcitonin; Corticosteroids; Infiltration