| “In situ” lymphoma |
| Biopsy of additional nodal or extranodal suspicious involvement |
| Physical examination |
| Blood flow cytometry |
| Computed tomography scan with intravenous contrast of neck, chest, abdomen, and pelvis |
| Unilateral bone marrow biopsy* |
| “In situ” lymphoma associated with overt lymphoma |
| Staging must be done as for overt lymphoma histotype |
| “In situ” lymphoma |
| Biopsy of additional nodal or extranodal suspicious involvement |
| Physical examination |
| Blood flow cytometry |
| Computed tomography scan with intravenous contrast of neck, chest, abdomen, and pelvis |
| Unilateral bone marrow biopsy* |
| “In situ” lymphoma associated with overt lymphoma |
| Staging must be done as for overt lymphoma histotype |
In the presence of signs/symptoms related to bone marrow involvement as well as flow cytometry abnormalities.