Stage I childhood non-Hodgkin lymphoma; drawing shows cancer in one group of lymph nodes. An inset shows a lymph node with a lymph vessel, an artery, and a vein. Lymphoma cells containing cancer are shown in the lymph node.
Stage I childhood non-Hodgkin lymphoma. Cancer is found in one group of lymph nodes or one area outside the lymph nodes, but no cancer is found in the abdomen or mediastinum (area between the lungs).