MONDO_0009815 (autosomal recessive osteopetrosis 1) is any autosomal recessive malignant osteopetrosis in which the cause of the disease is a mutation in the TCIRG1 gene. Also known as: OPTB1, TCIRG1 autosomal recessive malignant osteopetrosis, TCIRG1 autosomal recessive osteopetrosis, autosomal recessive Albers-Schonberg disease, autosomal recessive malignant osteopetrosis caused by mutation in TCIRG1, autosomal recessive osteopetrosis caused by mutation in TCIRG1, autosomal recessive osteopetrosis type 1, infantile malignant osteopetrosis 1.