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Difficulty: MediumHematology and Oncology

Match the following peripheral blood smear descriptions and associated clinical findings with their most likely underlying diagnosis or pathophysiologic state.

  • Red blood cells with blister-like defects and bite-like indentations, accompanied by denatured hemoglobin precipitates on supravital stain.Glucose-6-phosphate dehydrogenase (G6PD) deficiency
  • Small, dense red blood cells lacking a zone of central pallor, associated with a negative direct antiglobulin test (DAT) and increased mean corpuscular hemoglobin concentration (MCHC).Hereditary spherocytosis
  • Fragmented red blood cells with irregular shapes and sharp points, seen in a patient with severe thrombocytopenia, neurologic changes, and normal coagulation studies.Thrombotic thrombocytopenic purpura (TTP)
  • Tear-drop shaped red blood cells accompanied by nucleated red blood cells and immature myeloid cells, in a patient with massive splenomegaly.Primary myelofibrosis
  • Red blood cells containing small, round, dark-blue nuclear DNA remnants, in a patient with a history of recurrent infections with encapsulated bacteria.Functional or anatomic asplenia

Answer

The correct matches associate specific peripheral blood smear morphological findings with their hallmark hematologic disorders: Bite cells with G6PD deficiency, spherocytes with hereditary spherocytosis, schistocytes with TTP, teardrop cells with primary myelofibrosis, and Howell-Jolly bodies with asplenia.
Each peripheral smear finding is pathognomonic or highly suggestive of a specific condition when combined with the provided clinical context. Oxidative damage in G6PD deficiency creates bite cells; cytoskeletal defects in hereditary spherocytosis create spherocytes; microthrombi in TTP shear red cells into schistocytes; marrow fibrosis in primary myelofibrosis forces cells out as teardrops; and lack of splenic pitting in asplenia leaves Howell-Jolly bodies intact.

Step-by-Step Solution

1
Analyze the first smear description noting blister and bite cells with denatured hemoglobin.
Identified as oxidative hemolysis.
These findings are classic for G6PD deficiency where oxidative stress causes hemoglobin precipitation (Heinz bodies).
2
Evaluate the second description highlighting small, dense red blood cells lacking central pallor with a negative DAT.
Identified as a congenital membrane defect.
Spherocytes with a negative DAT rule out immune-mediated hemolysis, pointing directly to hereditary spherocytosis.
3
Assess the third presentation of fragmented red blood cells, severe thrombocytopenia, and normal coagulation.
Identified as a microangiopathic hemolytic anemia without consumptive coagulopathy.
The normal PT/aPTT differentiates TTP from DIC, which would present with prolonged coagulation times.
4
Review the fourth description of teardrop cells and a leukoerythroblastic reaction with splenomegaly.
Identified as marrow infiltration or fibrosis.
Primary myelofibrosis forces hematopoiesis into the spleen (causing splenomegaly) and results in distorted red cells (dacrocytes) exiting the fibrotic marrow.
5
Analyze the final description of red cells with nuclear DNA remnants and infection susceptibility.
Identified as splenic dysfunction.
The spleen normally pits Howell-Jolly bodies from red blood cells; its absence leads to their accumulation and a risk of encapsulated bacterial infections.

Key Concept

Peripheral blood smear morphology is crucial for diagnosing specific hematologic disorders by reflecting underlying pathophysiology such as membrane defects, oxidative damage, microangiopathy, marrow fibrosis, or splenic dysfunction.
Estimated Time:1m 30s
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Topics

Hematology and Oncology

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