A 28-year-old man presents to the clinic complaining of a painless, enlarging lump in his right neck that he noticed two months ago. He also reports drenching night sweats and a 5-kg (11-lb) weight loss over the past six weeks. On physical examination, a 3.5-cm, firm, rubbery, mobile lymph node is palpated in the right anterior cervical chain. The remainder of the examination is unremarkable. Basic laboratory studies reveal a normocytic anemia and an elevated erythrocyte sedimentation rate. The physician suspects a hematologic malignancy.
Arrange the following steps in the most appropriate clinical sequence for the definitive diagnosis, staging, and initial management of this patient.
- 1Perform an excisional biopsy of the enlarged cervical lymph node.
- 2Establish the exact histologic subtype via immunohistochemical staining of the biopsy specimen.
- 3Obtain a whole-body fluorodeoxyglucose (FDG) PET-CT scan.
- 4Assess baseline cardiac and pulmonary function (e.g., echocardiogram and spirometry).
- 5Initiate the first cycle of multi-agent systemic chemotherapy (e.g., ABVD).
Answer
The correct sequence is: Excisional biopsy → Histologic confirmation → PET-CT scan → Baseline cardiopulmonary testing → Initiation of chemotherapy.
The management of suspected lymphoma follows a strict protocol. First, an excisional biopsy is performed to obtain intact lymph node architecture. Second, the tissue undergoes histologic and immunohistochemical analysis to confirm the diagnosis (e.g., classic Hodgkin lymphoma). Third, a PET-CT scan is obtained for accurate Ann Arbor staging. Fourth, because standard treatments (such as ABVD) involve cardiotoxic (doxorubicin) and pulmonary toxic (bleomycin) agents, a baseline echocardiogram and pulmonary function tests must be obtained. Finally, with the diagnosis, stage, and baseline organ function established, systemic chemotherapy can be safely initiated.
Step-by-Step Solution
Key Concept
The sequential evaluation of suspected lymphoma prioritizes architectural tissue diagnosis (excisional biopsy), followed by exact histologic typing, radiologic staging, toxicity-risk assessment, and finally targeted treatment.