Clinical staging for patients with Hodgkin lymphoma (HL) includes a history, physical examination, laboratory studies (including sedimentation rate), and thoracic and abdominal/pelvic computerized tomographic (CT) scans.
Positron emission tomography (PET) scans, sometimes combined with CT scans, have replaced gallium scans and lymphangiography for clinical staging.[2,3,4] The use of PET scans to assess response and define the use or avoidance of further treatment is under clinical evaluation.[5,6,7,8,9,10] A prospective, multinational study of 260 newly diagnosed patients with HL obtained PET scans at baseline and after two cycles (four doses) of ABVD (doxorubicin plus bleomycin plus vinblastine plus dacarbazine); with a median follow-up of 2.2 years, the 2-year progression-free survival was 12.8% with a positive PET scan after two cycles and 95% with a negative PET scan after two cycles (P < .0001). In a prospective trial of BEACOPP-based therapy—which includes the drugs bleomycin, etoposide, doxorubicin hydrochloride, cyclophosphamide, vincristine sulfate, procarbazine, and prednisone— for previously untreated patients with advanced-stage HL, patients with residual abnormalities measuring 2.5 cm or more received a PET scan at the end of therapy. A negative PET scan predicted no progression or relapse within 1 year for 94% of patients (confidence interval, 91%–97%). Whether consolidation with radiation therapy can be omitted for PET-negative patients must await overall survival data at 5 years. Only further prospective studies can assess whether improved outcomes can be achieved by altering the therapeutic strategy based on PET scan results.
Bone marrow involvement occurs in 5% of patients; biopsy is indicated in the presence of constitutional B symptoms or anemia, leukopenia, or thrombocytopenia. Staging laparotomy is no longer recommended; it should be considered only when the results will allow substantial reduction in treatment. It should not be done in patients who require chemotherapy. If the laparotomy is required for treatment decisions, the risks of potential morbidity should be considered.[12,13,14,15] The staging classification that is currently used for HL was adopted in 1971 at the Ann Arbor Conference  with some modifications 18 years later from the Cotswolds meeting.
Subclassification of stage
Stages I, II, III, and IV adult HL can be subclassified into A and B categories: B for those with defined general symptoms and A for those without B symptoms. The B designation is given to patients with any of the following symptoms:
The most significant B symptoms are fevers and weight loss. Night sweats alone do not confer an adverse prognosis. Pruritus as a systemic symptom remains controversial and is not considered a B symptom in the Ann Arbor staging system. (Refer to the PDQ summary on Pruritis for more information.) This symptom is hard to define quantitatively and uniformly, but when it is recurrent, generalized, and otherwise unexplained, and when it ebbs and flows parallel to disease activity, it may be the equivalent of a B symptom.
The designation E is used when well-localized extranodal lymphoid malignancies arise in or extend to tissues beyond, but near, the major lymphatic aggregates. Stage IV refers to disease that is diffusely spread throughout an extranodal site, such as the liver. If pathologic proof of involvement of one or more extralymphatic sites has been documented, the symbol for the site of involvement, followed by a plus sign (+), is listed.