spinal myelitistransverse myelitis spinal corddefinition of transverse myelitischronic transverse myelitispathophysiology of transverse myelitistransverse myelitis complicationsidiopathic transverse myelitisdiagnosis of transverse myelitisincomplete transverse myelitisinfectious transverse myelitistransverse myelitis prognosispartial transverse myelitis