Osteopetrosis and Chiari type I malformation: a rare association

Osteopetrosis (OP) is hereditary X-linked, autosomal recessive (ARO), or autosomal dominant (ADO) skeletal disease. ARO has two subtypes, which are infantile malignant and intermediate type. ARO and X-linked OP have poor clinical outcome. ADO is called adult benign type because of the normal life expectancy, which has type I and type II. Here, the authors present an ADO patient with Chiari type I. Concomitant ADO with Chiari type I malformation is an extremely rare condition. Literature research yielded only one case report to date.