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Difficulty: HardHematology and Oncology

A 2828-year-old man presents to the clinic with a 33-month history of a painless, slowly enlarging mass in his right supraclavicular region. He also reports an unintentional weight loss of 6 kg6\text{ kg} (13 lbs13\text{ lbs}) and drenching night sweats over the past month. Physical examination reveals a 4-cm4\text{-cm}, firm, non-tender, and mobile lymph node in the right supraclavicular fossa. The remainder of the examination, including abdominal palpation, is unremarkable. A complete blood count and comprehensive metabolic panel are within normal limits.

Arrange the following clinical steps in the most appropriate chronological order for the definitive evaluation and management of this patient's suspected condition.

  1. 1Perform an excisional biopsy of the enlarged supraclavicular lymph node.
  2. 2Confirm the diagnosis via histopathologic identification of Reed-Sternberg cells.
  3. 3Perform a whole-body 18F-FDG PET/CT scan to determine the clinical stage of the disease.
  4. 4Obtain an echocardiogram and pulmonary function tests to assess baseline organ function.
  5. 5Initiate systemic combination chemotherapy with an ABVD regimen.

Answer

The correct sequence is: Excisional biopsy -> Histopathologic confirmation -> PET/CT staging -> Baseline organ function testing (Echo/PFTs) -> Initiation of chemotherapy.
The management of highly suspected Hodgkin lymphoma follows a strict, sequential clinical protocol. First, an excisional lymph node biopsy is mandatory, as fine-needle aspiration destroys the critical tissue architecture needed for lymphoma classification. Following the biopsy, histopathologic review establishes the definitive diagnosis by confirming the presence of Reed-Sternberg cells. Once the diagnosis is secured, the patient must undergo staging with an 18F-FDG PET/CT scan to determine the anatomic extent of the disease, which dictates the number of chemotherapy cycles and the role of radiotherapy. Before starting the standard ABVD (doxorubicin, bleomycin, vinblastine, dacarbazine) regimen, baseline organ function must be assessed due to the known cardiotoxicity of doxorubicin and the pulmonary toxicity of bleomycin. Therefore, an echocardiogram and pulmonary function tests are required pre-treatment steps. Finally, with diagnosis, staging, and safety parameters established, systemic combination chemotherapy is initiated.

Step-by-Step Solution

1
Evaluate the clinical presentation of 'B symptoms' and painless supraclavicular lymphadenopathy.
Identify the immediate need for an intact tissue sample, prioritizing an excisional lymph node biopsy.
Lymphoma diagnosis requires visualization of the entire lymph node architecture, which is inherently destroyed by fine-needle aspiration techniques.
2
Analyze the excised lymph node tissue.
Establish the definitive diagnosis of classic Hodgkin lymphoma via the identification of Reed-Sternberg cells.
Therapeutic and staging algorithms cannot proceed without a confirmed histologic subtype.
3
Map the anatomic distribution of the confirmed malignancy.
Order a whole-body 18F-FDG PET/CT scan for clinical staging.
The stage of the disease (Ann Arbor classification) determines the intensity and duration of the required chemotherapy.
4
Evaluate the patient's physiological capacity to tolerate the indicated treatment.
Perform an echocardiogram and pulmonary function tests.
The standard ABVD regimen includes doxorubicin and bleomycin, requiring baseline cardiac ejection fraction and pulmonary diffusion capacity measurements prior to exposure.
5
Begin definitive medical management.
Initiate systemic ABVD combination chemotherapy.
Treatment is administered safely and effectively only after the diagnostic, staging, and safety prerequisite steps are complete.

Key Concept

Algorithmic diagnosis, staging, and pre-treatment evaluation of Hodgkin Lymphoma.
Estimated Time:1m 30s
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Topics

Hematology and Oncology

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