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Difficulty: MediumHematology and Oncology

Match each patient's clinical presentation with the most likely corresponding peripheral blood smear finding.

  • An adult woman with a history of systemic lupus erythematosus is evaluated for new-onset scleral icterus, fatigue, and an elevated reticulocyte count.Spherocytes
  • An elderly patient reports early satiety and progressive weakness; physical examination reveals massive splenomegaly, while bone marrow aspiration yields a 'dry tap'.Teardrop cells (dacrocytes)
  • A middle-aged individual with a mechanical aortic valve replacement complains of exertional dyspnea and passing dark urine.Schistocytes (fragmented red blood cells)
  • An older adult is found to have a markedly elevated white blood cell count and generalized painless lymphadenopathy during a routine health maintenance visit.Smudge cells

Answer

The systemic lupus erythematosus case matches with Spherocytes. The massive splenomegaly and 'dry tap' case matches with Teardrop cells. The mechanical valve case matches with Schistocytes. The leukocytosis and lymphadenopathy case matches with Smudge cells.
Each peripheral smear finding uniquely aligns with the distinct pathophysiologic mechanism presented in the corresponding vignette: immune-mediated membrane loss (spherocytes), marrow architectural distortion (teardrop cells), intravascular mechanical shear (schistocytes), and inherent cellular fragility in leukemia (smudge cells).

Step-by-Step Solution

1
Evaluate the clinical vignette describing the patient with systemic lupus erythematosus and jaundice.
Identify the mechanism as autoimmune hemolytic anemia, which correlates with spherocytes.
SLE produces autoantibodies that coat red blood cells, leading to partial phagocytosis in the spleen and loss of membrane surface area.
2
Analyze the presentation of massive splenomegaly and a 'dry tap'.
Diagnose primary myelofibrosis, which correlates with teardrop cells.
Fibrosis in the bone marrow alters the structural architecture, 'pinching' red blood cells as they exit into circulation.
3
Assess the patient with a mechanical aortic valve and signs of hemolysis (dark urine).
Identify mechanical hemolysis, which correlates with schistocytes.
Prosthetic hardware physically shears erythrocytes in the bloodstream, resulting in cellular fragments.
4
Review the asymptomatic older patient with high white blood cells and adenopathy.
Diagnose chronic lymphocytic leukemia, which correlates with smudge cells.
Malignant lymphocytes in CLL lack structural integrity and break apart under the physical stress of creating a peripheral blood smear.

Key Concept

Correlation of peripheral blood smear cellular morphology with underlying hematologic and oncologic pathophysiology.
Estimated Time:1m 30s
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Topics

Hematology and Oncology

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