A sclerosing disorder of the skeleton characterized by increased bone density that classically displays the radiographic sign of ''sandwich vertebrae'' (dense bands of sclerosis parallel to the vertebral endplates). The disease is autosomal dominant osteopetrosis 2 (MONDO_0008156, a Monarch Disease Ontology entry). Also known as: Albers-Schonberg osteopetrosis, Albers-Schönberg osteopetrosis, OPTA2, autosomal dominant Albers-Schonberg disease, autosomal dominant osteopetrosis type 2, autosomal dominant osteopetrosis type II, osteopetrosis autosomal dominant type 2, osteopetrosis, autosomal dominant type 2.