mediastinum rhabdomyosarcoma (MONDO_0002851) is a malignant mesenchymal tumor with skeletal muscle differentiation affecting the mediastinum. Also known as: mediastinal rhabdomyosarcoma, mediastinum rhabdomyosarcoma (disease), rhabdomyosarcoma (disease) of mediastinum, rhabdomyosarcoma of mediastinum, rhabdomyosarcoma of the mediastinum.