<unk>  cell<unk>  may be classified according to the extent of organ involvement into 4 groups: pulmonary<unk>  cell<unk> , unifocal<unk>  cell<unk> , multifocal unisystem<unk>  cell<unk> , and multifocal multisystem<unk>  cell<unk> .
Langerhans cell histiocytosis classification
B-cell lymphoma classification
Malignant fibrous histiocytoma classification
T-cell lymphoma classification
Thymoma classification
Burkitt's lymphoma classification
Osteosarcoma classification
Primary central nervous system lymphoma classification