Examkin

Question

Difficulty: HardHematology and Oncology

Hematologic malignancies frequently manifest with unique peripheral blood smear abnormalities that reflect the underlying pathophysiologic disruption of normal hematopoiesis. Match each of the following patient vignettes to the most likely underlying hematologic diagnosis.

  • Early satiety and massive splenomegaly in a 68-year-old patient. The complete blood count indicates moderate anemia. Notably, the peripheral blood smear demonstrates nucleated erythrocytes alongside dacrocytes, and bone marrow aspiration yields a "dry tap."Primary myelofibrosis
  • Profound leukocytosis (75,000/mm³) is discovered in a 54-year-old patient reporting night sweats and weight loss. The smear reveals an expanded spectrum of myeloid cells at all stages of maturation, accompanied by absolute basophilia and a low leukocyte alkaline phosphatase score.Chronic myeloid leukemia
  • Progressive pancytopenia develops in a 72-year-old patient who previously received alkylating chemotherapy for breast cancer. The peripheral blood smear is remarkable for hypogranular neutrophils with bilobed nuclei resembling spectacles.Myelodysplastic syndrome
  • Routine laboratory screening in an asymptomatic 62-year-old reveals a leukocyte count of 85,000/mm³. The dominant cells on the peripheral smear are small, mature-appearing lymphocytes, intermixed with numerous ruptured nuclear remnants lacking intact cytoplasm.Chronic lymphocytic leukemia
  • A 45-year-old patient rapidly develops mucosal bleeding, severe thrombocytopenia, and a prolonged prothrombin time. The peripheral smear is heavily populated by large, immature cells possessing prominent nucleoli and distinct linear, reddish-purple cytoplasmic inclusions.Acute promyelocytic leukemia

Answer

Primary myelofibrosis (teardrop cells/dry tap), Chronic myeloid leukemia (basophilia/low LAP), Myelodysplastic syndrome (pseudo-Pelger-Huët anomaly), Chronic lymphocytic leukemia (smudge cells), and Acute promyelocytic leukemia (Auer rods/DIC).
Each vignette represents a highly classic clinical and laboratory presentation for a specific hematologic malignancy. The presence of dacrocytes with a dry tap defines primary myelofibrosis; basophilia with a low LAP score confirms CML; bilobed neutrophils post-chemotherapy indicates MDS; smudge cells in an asymptomatic older adult point to CLL; and Auer rods driving DIC establish the diagnosis of APL.

Step-by-Step Solution

1
Analyze the peripheral smear finding of dacrocytes (teardrop cells) alongside a 'dry tap' on bone marrow aspiration.
These findings point to bone marrow fibrosis forcing extramedullary hematopoiesis (splenomegaly), defining Primary myelofibrosis.
As the marrow space is replaced by collagen, red blood cells are mechanically 'squeezed' into teardrop shapes as they exit.
2
Identify the significance of absolute basophilia and a full spectrum of myeloid maturation with a low LAP score.
This is the characteristic hematologic signature of Chronic myeloid leukemia (CML).
Unlike benign leukemoid reactions (which have a high LAP score and lack basophilia), CML represents an unregulated, neoplastic proliferation of myeloid elements.
3
Evaluate the patient with prior chemotherapy presenting with pancytopenia and pseudo-Pelger-Huët anomaly.
This indicates therapy-related Myelodysplastic syndrome (MDS).
Prior exposure to DNA-damaging agents (like alkylating agents) can cause acquired mutations leading to dysplastic, ineffective hematopoiesis years later.
4
Correlate asymptomatic marked leukocytosis with small mature lymphocytes and smudge cells.
This describes Chronic lymphocytic leukemia (CLL).
CLL cells are functionally incompetent and mechanically fragile, causing them to routinely rupture into 'smudge cells' during the physical shearing of slide preparation.
5
Link mucosal bleeding, coagulopathy (DIC), and large immature cells with Auer rods.
This triad is the hallmark medical emergency of Acute promyelocytic leukemia (APL).
Promyeloblasts in APL contain primary granules that, when released, powerfully activate the coagulation cascade leading to severe DIC.

Key Concept

Identifying specific hematologic malignancies by correlating pathognomonic peripheral blood smear findings with patient history and clinical presentation.
Estimated Time:2m 0s
Rate this question

Topics

Hematology and Oncology

More questions from this topic