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Question

Difficulty: MediumHematology and Oncology

Match the following distinct peripheral blood smear findings to their most likely underlying clinical condition or pathophysiology.

  • Teardrop-shaped red blood cells (dacrocytes) and nucleated red blood cellsPrimary myelofibrosis
  • Bite cells (degmacytes) and Heinz bodiesGlucose-6-phosphate dehydrogenase deficiency
  • Hypersegmented neutrophils (≥ 5 lobes) and macroovalocytesVitamin B12 or folate deficiency
  • Schistocytes (fragmented red blood cells) and severe thrombocytopeniaThrombotic thrombocytopenic purpura

Answer

Teardrop cells pair with Primary myelofibrosis; Bite cells pair with Glucose-6-phosphate dehydrogenase deficiency; Hypersegmented neutrophils pair with Vitamin B12 or folate deficiency; Schistocytes pair with Thrombotic thrombocytopenic purpura.
Each peripheral smear finding is directly linked to its underlying pathophysiology. Marrow fibrosis causes teardrop cells; oxidative stress in G6PD deficiency causes Heinz bodies and bite cells; DNA synthesis defects cause megaloblastic changes; and microvascular thrombosis causes schistocytes.

Step-by-Step Solution

1
Analyze the peripheral smear finding of teardrop cells and nucleated red blood cells.
Matches Primary myelofibrosis.
Bone marrow fibrosis forces RBC precursors to squeeze through tight spaces, deforming them into teardrop shapes (dacrocytes).
2
Analyze the peripheral smear finding of bite cells and Heinz bodies.
Matches Glucose-6-phosphate dehydrogenase deficiency.
Oxidative damage precipitates hemoglobin (Heinz bodies), which splenic macrophages remove, leaving a 'bite' out of the cell.
3
Analyze the finding of hypersegmented neutrophils and macroovalocytes.
Matches Vitamin B12 or folate deficiency.
Defective DNA synthesis leads to megaloblastic changes, resulting in large RBCs and hypersegmentation of neutrophil nuclei.
4
Analyze the finding of schistocytes and thrombocytopenia.
Matches Thrombotic thrombocytopenic purpura.
Platelet-rich microthrombi shear passing RBCs in the microvasculature, producing fragmented cells (schistocytes).

Key Concept

Recognition of classic peripheral blood smear findings is essential for diagnosing specific hematologic disorders, including structural marrow abnormalities, enzyme deficiencies, maturation defects, and microangiopathic processes.
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Topics

Hematology and Oncology

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