Questions
3-4 questions in typical university papers
Difficulty
Medium-Hard
Importance
High yield for MBBS and BMLT/Nursing semester exams
Overview
Leukemia and hematologic malignancies are conditions characterized by the uncontrolled proliferation of blood-forming cells, leading to bone marrow failure and systemic symptoms. Mastery of these topics is crucial for understanding systemic pathology, diagnostic hematology, and the clinical classification of blood cancers. An aspirant must focus on the differentiation between acute and chronic lineages to score well in both theory and viva exams.
Leukemia Classification
Leukemias are categorized by the rate of progression (acute vs. chronic) and the cell line involved (myeloid vs. lymphoid). Acute leukemias are marked by the presence of undifferentiated blasts, whereas chronic leukemias involve the accumulation of mature but dysfunctional cells.
- AML: Acute Myeloid Leukemia characterized by Auer rods
- ALL: Acute Lymphoblastic Leukemia, common in children
- CML: Chronic Myeloid Leukemia linked to Philadelphia chromosome
- CLL: Chronic Lymphocytic Leukemia, common in elderly adults
- FAB classification systems for staging
Multiple Myeloma
Multiple Myeloma is a malignant proliferation of plasma cells in the bone marrow, resulting in the production of monoclonal immunoglobulins. It is characterized by destructive bone lesions, renal failure, and hypercalcemia, often presenting with bone pain.
- CRAB criteria: Calcium elevation, Renal insufficiency, Anemia, Bone lesions
- Bence-Jones proteins in urine
- M-spike observed on serum protein electrophoresis
- Rouleaux formation in peripheral blood smear
- Increased plasma cells in bone marrow biopsy (>10%)
Platelet Disorders & Thrombocythemia
These disorders involve either quantitative or qualitative abnormalities of platelets, leading to thrombotic or hemorrhagic complications. Essential Thrombocythemia is a myeloproliferative neoplasm resulting in marked elevation of platelet counts and potential vasomotor symptoms.
- Thrombocytopenia: Platelet count below 150,000/µL
- Essential Thrombocythemia: JAK2 mutation association
- Platelet function defects: Bernard-Soulier or Glanzmann thrombasthenia
- Primary vs. Secondary thrombocythemia differentiation
- Risk of arterial and venous thrombosis
Exam Tip
Always link the clinical presentation (like petechiae or bone pain) to the underlying hematologic pathology to gain extra marks in subjective questions.
Common Mistakes
- Confusing the Philadelphia chromosome with other translocations in leukemias.
- Failing to distinguish between primary (clonal) and secondary (reactive) thrombocytosis in diagnostic scenarios.
- Ignoring the specific 'CRAB' acronym components when describing Multiple Myeloma symptoms.
More Revision Notes
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