| An extremely rare primary bone dysplasia with increased bone density disorder characterized by severe osteoclast-poor osteopetrosis associated with hypogammaglobulinemia. Patients typically present infantile malignant osteopetrosis (manifesting with increased bone density, bone fractures, abnormal eye movements/visual loss, nystagmus), hematologic abnormalities with bone marrow failure (for example anemia, hepatosplenomegaly) and immunological deficiency (manifesting as recurrent respiratory infections) associated with reduced immunoglobulin levels due to impaired peripheral B cell differentiation. There is evidence the disease is caused by homozygous or compound heterozygous mutation in the TNFRSF11A gene on chromosome 18q21. |
