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Difficulty: MediumHematology and Oncology

A 28-year-old woman presents to the outpatient clinic reporting a painless swelling in her neck that has progressively enlarged over the past two months. She also describes experiencing drenching night sweats that require her to change her sleepwear, along with an unintended 5-kg (11-lb) weight loss during this time frame. Vital signs reveal a temperature of 37.9∘C37.9^\circ\text{C} (100.2∘F100.2^\circ\text{F}). Physical examination identifies a 3.5-cm, firm, rubbery, mobile, and non-tender lymph node in the left supraclavicular fossa. The remainder of the examination shows no other palpable adenopathy or hepatosplenomegaly. Arrange the following steps in the most appropriate clinical sequence for the evaluation and management of this patient's condition.

  1. 1Obtain initial laboratory tests including a complete blood count, comprehensive metabolic panel, and serum lactate dehydrogenase (LDH).
  2. 2Perform an excisional biopsy of the enlarged left supraclavicular lymph node.
  3. 3Perform a whole-body positron emission tomography-computed tomography (PET-CT) scan.
  4. 4Obtain a transthoracic echocardiogram to assess baseline left ventricular ejection fraction.
  5. 5Initiate definitive multi-agent systemic chemotherapy.

Answer

The correct sequence is: Initial laboratory tests (CBC, CMP, LDH), followed by an excisional lymph node biopsy, then whole-body PET-CT scan for staging, followed by a transthoracic echocardiogram for cardiac clearance, and finally the initiation of multi-agent systemic chemotherapy.
The standard sequence for a patient presenting with classic 'B symptoms' and a suspicious supraclavicular lymph node begins with non-invasive baseline laboratories to assess general health and tumor burden (LDH). The most critical next step is obtaining a definitive tissue diagnosis via an excisional lymph node biopsy, as maintaining tissue architecture is mandatory for lymphoma subtyping. Once the diagnosis is confirmed histologically, the disease must be staged using a PET-CT scan to determine its extent. Because the curative regimens for most lymphomas (like ABVD or CHOP) utilize cardiotoxic anthracyclines, a baseline echocardiogram is required before any drugs are infused. Finally, with the diagnosis, stage, and physiologic safety confirmed, systemic chemotherapy is initiated.

Step-by-Step Solution

1
Obtain initial laboratory tests.
Establishes baseline hematologic and metabolic function, and identifies prognostic markers like elevated LDH.
Provides a safe baseline and assesses tumor burden prior to pursuing invasive diagnostic testing.
2
Perform an excisional lymph node biopsy.
Yields a definitive histopathologic diagnosis and immunophenotype.
Intact lymph node architecture is necessary to distinguish between lymphoma subtypes (e.g., Hodgkin vs. non-Hodgkin); fine-needle aspiration (FNA) ruins this architecture and is inadequate.
3
Obtain a whole-body PET-CT scan.
Determines the full anatomic extent of the disease.
Accurate staging dictates the intensity, duration, and specific type of chemotherapy and/or radiation required.
4
Perform a transthoracic echocardiogram.
Measures the baseline left ventricular ejection fraction.
Anthracyclines (e.g., doxorubicin in ABVD or R-CHOP regimens) carry a risk of dose-dependent, irreversible cardiotoxicity. Baseline cardiac clearance is a strict prerequisite.
5
Initiate multi-agent systemic chemotherapy.
Targets and eradicates the malignant lymphoid cells.
Definitive treatment must be guided by the exact histology, stage, and physiologic baseline established in the preceding steps.

Key Concept

Sequential algorithm for the diagnosis, staging, and pre-treatment preparation of lymphomas.
Estimated Time:2m 0s
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Topics

Hematology and Oncology

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