Match each patient's clinical presentation with the most characteristic peripheral blood smear finding associated with their underlying hematologic condition.
- A 24-year-old man presents with dark urine and jaundice three days after receiving trimethoprim-sulfamethoxazole; his direct antiglobulin test is negative.Bite cells (degmacytes)
- A 65-year-old woman with chronic lymphocytic leukemia presents with new-onset fatigue, jaundice, and a strongly positive direct antiglobulin test.Spherocytes lacking central pallor
- A 28-year-old man of Mediterranean descent is found to have a lifelong asymptomatic microcytic anemia with normal iron studies.Target cells (codocytes)
- A 70-year-old man presents with progressive fatigue, massive splenomegaly, and an unsuccessful bone marrow aspiration (dry tap).Teardrop cells (dacrocytes)
Answer
The clinical presentations correctly match as follows: the patient with sulfa-induced hemolysis (G6PD deficiency) matches with bite cells; the CLL patient with positive DAT (autoimmune hemolytic anemia) matches with spherocytes; the patient with lifelong microcytosis (thalassemia trait) matches with target cells; and the patient with a dry tap and splenomegaly (primary myelofibrosis) matches with teardrop cells.
Each correct pairing relies on recognizing the classic clinical vignette for a specific hematologic disorder and linking it to its pathophysiological morphological hallmark. G6PD deficiency causes oxidative damage (bite cells), autoimmune hemolytic anemia causes macrophage-mediated membrane loss (spherocytes), thalassemia alters the surface-to-volume ratio (target cells), and primary myelofibrosis mechanically squeezes red cells (teardrop cells).
Step-by-Step Solution
Key Concept
Characteristic peripheral blood smear findings directly reflect the pathophysiologic mechanisms of varying anemias, such as oxidative damage (bite cells), membrane loss (spherocytes), altered hemoglobin-to-membrane ratio (target cells), or physical marrow distortion (teardrop cells).