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)
Cevap
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).
Adım Adım Çözüm
Anahtar Kavram
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).