Staging procedures for “in situ” lymphomas
| “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.