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Difficulty: MediumHematology and Oncology

Match each hematologic disorder with its most characteristic peripheral blood smear finding and associated laboratory profile.

  • Thrombotic thrombocytopenic purpura (TTP)Numerous schistocytes, severe thrombocytopenia, and normal prothrombin time (PT)
  • Chronic myeloid leukemia (CML)Leukocytosis with full myeloid spectrum, prominent myelocytes, and absolute basophilia
  • Lead poisoningMicrocytic red blood cells with coarse basophilic stippling
  • Multiple myelomaErythrocytes stacked in linear arrays (rouleaux formation)

Answer

Thrombotic thrombocytopenic purpura matches with numerous schistocytes and normal PT. Chronic myeloid leukemia matches with leukocytosis, full myeloid spectrum, and absolute basophilia. Lead poisoning matches with microcytic red blood cells and coarse basophilic stippling. Multiple myeloma matches with rouleaux formation.
Each hematologic condition presents with unique, pathognomonic peripheral smear findings driven by their distinct underlying pathophysiology. Matching these correctly confirms an understanding of both visual hematology morphology and disease mechanisms.

Step-by-Step Solution

1
Analyze the pathophysiology of Thrombotic thrombocytopenic purpura (TTP)
Identify that TTP causes microvascular platelet thrombi without coagulation factor consumption.
This directly matches the smear finding of red blood cell fragmentation (schistocytes) alongside thrombocytopenia but normal PT/PTT.
2
Evaluate the cellular proliferation pattern in Chronic myeloid leukemia (CML)
Identify unregulated myeloid lineage expansion, including basophils and eosinophils.
The presence of the full spectrum of immature myeloid cells and absolute basophilia confirms the diagnosis and differentiates it from a leukemoid reaction.
3
Identify the toxic effects of Lead poisoning on erythrocytes
Recognize the inhibition of RNA degradation leading to retained ribosomal aggregates.
These aggregates are visually represented as coarse basophilic stippling within microcytic red blood cells.
4
Assess the impact of paraproteinemia in Multiple myeloma
Identify the neutralization of the red blood cell zeta potential.
This loss of repulsive surface charge causes erythrocytes to adhere to one another in linear stacks, forming rouleaux.

Key Concept

Characteristic peripheral blood smear findings are crucial for distinguishing between various hematologic and oncologic disorders, reflecting their unique underlying pathophysiologies.
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Topics

Hematology and Oncology

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