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Difficulty: EasyHematology and Oncology

A 2424-year-old man presents to the clinic with a 22-month history of painless swelling in the right side of his neck. He also reports drenching night sweats and an unintentional 55-kg (1111-lb) weight loss over this period. Physical examination reveals a non-tender, firm, mobile 33-cm cervical lymph node. Arrange the following steps in the correct sequential order for the definitive diagnosis, staging, and management of this patient's most likely condition.

  1. 1Perform an excisional lymph node biopsy
  2. 2Obtain a whole-body fluorodeoxyglucose (FDG) PET/CT scan
  3. 3Initiate stage-directed multiagent chemotherapy
  4. 4Perform a follow-up interim or post-treatment PET/CT scan

Answer

The correct sequence is to first secure a tissue diagnosis via excisional biopsy, followed by baseline PET/CT staging, then the initiation of targeted chemotherapy, and finally restaging with a follow-up PET/CT scan.
The fundamental algorithmic approach in oncology is 'Diagnose, Stage, Treat, Monitor'. For a young patient with B symptoms (night sweats, weight loss) and persistent lymphadenopathy highly suspicious for Hodgkin lymphoma, an excisional biopsy is mandatory to secure the diagnosis. Following this, a PET/CT is required for accurate baseline staging. Only then is stage-directed chemotherapy initiated, followed later by a repeat PET/CT scan to assess metabolic and anatomic treatment efficacy.

Step-by-Step Solution

1
Establish a definitive tissue diagnosis.
Perform an excisional lymph node biopsy.
Fine-needle aspiration is often insufficient for diagnosing lymphoma. An excisional biopsy preserves the nodal architecture required for accurate histologic classification.
2
Determine the anatomic and metabolic extent of the disease.
Obtain an FDG PET/CT scan.
Accurate baseline staging (e.g., Ann Arbor system) is essential because it determines the intensity, number of cycles, and specific type of treatment required.
3
Administer definitive systemic treatment.
Initiate multiagent chemotherapy.
Once the specific diagnosis and stage are confirmed, the appropriately tailored chemotherapy regimen can be safely initiated.
4
Assess the therapeutic response.
Perform a follow-up PET/CT scan.
Interim or end-of-treatment restaging evaluates whether the disease is responding to the chemotherapy, allowing clinicians to modify therapy appropriately.

Key Concept

The standard oncologic paradigm for suspected lymphoma follows a strict sequence: obtain a definitive tissue diagnosis (excisional biopsy), perform baseline staging to determine disease extent (PET/CT), initiate stage-appropriate therapy, and subsequently monitor treatment response.
Estimated Time:45s
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Topics

Hematology and Oncology

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