Monarch Disease Ontology identifier MONDO_0002580 (orbit rhabdomyosarcoma) is a malignant mesenchymal neoplasm with skeletal muscle differentiation that arises from the orbit. Also known as: orbital region rhabdomyosarcoma, orbital region rhabdomyosarcoma (disease), rhabdomyosarcoma (disease) of orbital region, rhabdomyosarcoma of orbit, rhabdomyosarcoma of the orbit.