Non-hodgkin lymphoma (children)

A single tumour (extranodal) or single anatomic area (nodal) with the exclusion of mediastinum or abdomen.

A single tumour (extranodal) with regional node involvement. Two or more nodal areas on the same side of the diaphragm. Two single (extranodal) tumours with or without regional node involvement on the same side of the diaphragm.

A primary gastrointestinal tract tumour, usually in the ileocecal area, with or without involvement of associated mesenteric nodes only, grossly completely resected.

Two single tumours (extranodal) on opposite sides of the diaphragm. Two or more nodal areas above and below the diaphragm. All the primary intrathoracic tumours (mediastinal, pleural, thymic). All extensive primary intraabdominal disease, unresectable. All paraspinal or epidural tumours, regardless of other tumour site(s).

Any of the above with initial CNS and/or bone marrow involvement.