Hematopathology — MCQs
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Which is the most common cytogenetic abnormality in myelodysplastic syndrome (MDS)?
In blood transfusion, which blood group system is most important?
Which of the following statements regarding hematological malignancies is true?
Microangiopathic hemolytic anemia is associated with which of the following conditions?
Which of the following is not an example of a malignant disorder causing myelofibrosis?
The Philadelphia chromosome is an example of which of the following chromosomal abnormalities?
What does a low serum ferritin level indicate?
A 30-year-old woman complains of recent easy fatigability, bruising, and recurrent throat infections. Physical examination reveals numerous petechiae over her body and mouth. Abnormal laboratory findings include hemoglobin of 6 g/dL, WBC of 1,500/mL, and platelets of 20,000/mL. The bone marrow is hypocellular and displays increased fat. What is the appropriate diagnosis?
In case of Myelofibrosis, what is most likely to be seen on the peripheral blood smear?
Multiple myeloma is a tumor of which cell type?
Hematopathology Indian Medical PG Practice Questions and MCQs
Question 21: Which is the most common cytogenetic abnormality in myelodysplastic syndrome (MDS)?
- A. Trisomy 8
- B. 20q-
- C. 5q-
- D. Monosomy 7 (Correct Answer)
Explanation: **Explanation:** Myelodysplastic Syndromes (MDS) are a group of clonal hematopoietic stem cell disorders characterized by cytopenia and a risk of progression to Acute Myeloid Leukemia (AML) [1]. Cytogenetic abnormalities are present in approximately 50% of primary MDS cases [2]. **Why Monosomy 7 is the correct answer:** While **5q deletion (5q-)** is often cited as the most common *isolated* structural abnormality, **Monosomy 7 (-7)** and **7q deletion (7q-)** are collectively the most frequently observed chromosomal aberrations in MDS, particularly in therapy-related MDS (t-MDS) and pediatric cases. In many standardized examinations, including NEET-PG, Monosomy 7 is recognized as the most common single numerical abnormality and carries a poor prognosis [1]. **Analysis of Incorrect Options:** * **Trisomy 8 (+8):** This is a common numerical abnormality in MDS, but it is less frequent than involvements of chromosome 7 or 5. It is associated with an intermediate prognosis. * **20q-:** This is a relatively common recurring structural abnormality (seen in ~5% of cases). It is often associated with a favorable prognosis but is less frequent than 5q- or -7. * **5q-:** This is the most common *structural* abnormality. When it occurs as an isolated finding, it defines the "5q- syndrome," which typically affects elderly women and has a favorable prognosis. **High-Yield Clinical Pearls for NEET-PG:** * **Best Prognosis:** Isolated 5q-, isolated 20q-, or normal cytogenetics. * **Worst Prognosis:** Complex karyotype (≥3 abnormalities) or Monosomy 7 [1]. * **5q- Syndrome:** Characterized by macrocytic anemia, normal to increased platelet count, and "hypolobated micromegakaryocytes" in the bone marrow. * **Ring Sideroblasts:** Associated with *SF3B1* mutations (Refractory Anemia with Ring Sideroblasts). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 622-624. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 613-614.
Question 22: In blood transfusion, which blood group system is most important?
- A. Kell (Correct Answer)
- B. Lewis
- C. Li
- D. Lutheran
Explanation: **Explanation:** In the context of clinical blood transfusion, the **Kell blood group system** is considered the most important after the ABO and Rh systems. **1. Why Kell is the Correct Answer:** The Kell system (specifically the **K or K1 antigen**) is highly **immunogenic**, second only to the D antigen of the Rh system [1]. Approximately 90% of the population is Kell-negative ($K-$); if these individuals receive Kell-positive blood, they are likely to develop anti-K antibodies. These antibodies are IgG in nature and can cause **Severe Delayed Hemolytic Transfusion Reactions (DHTR)** and are a major cause of **Hemolytic Disease of the Fetus and Newborn (HDFN)** [2], where they suppress fetal erythropoiesis [3]. **2. Why Other Options are Incorrect:** * **Lewis System:** These antigens are not integral to the RBC membrane but are adsorbed from the plasma. Lewis antibodies are usually IgM, naturally occurring, and rarely cause hemolysis [1]. * **Ii System:** The 'I' antigens are related to cold agglutinins. Anti-I antibodies are typically "cold" IgM antibodies that do not cause transfusion reactions unless they have a high thermal amplitude (as seen in Mycoplasma infections). * **Lutheran System:** These antigens have low immunogenicity. Antibodies against them are rare and usually result in mild, clinically insignificant transfusion reactions. **3. High-Yield Clinical Pearls for NEET-PG:** * **McLeod Phenotype:** A rare condition characterized by the absence of Kx antigens on RBCs, leading to acanthocytosis and muscular dystrophy-like symptoms. * **Universal Rule:** Always cross-match for Kell in multi-transfused patients (e.g., Thalassemia) to prevent alloimmunization. * **Duffy System:** Notable because the $Fy(a-b-)$ phenotype provides resistance to *Plasmodium vivax* malaria. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 627-628. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 603-604. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 469-470.
Question 23: Which of the following statements regarding hematological malignancies is true?
- A. Chronic myeloid leukemia typically occurs in individuals over 50 years of age.
- B. Hairy cell leukemia in patients younger than 50 years generally has a good prognosis.
- C. Acute lymphoid leukemia can occur in individuals less than 1 year of age. (Correct Answer)
- D. Chronic lymphocytic leukemia is primarily seen in individuals younger than 50 years of age.
Explanation: **Explanation:** **Correct Answer: C. Acute lymphoid leukemia can occur in individuals less than 1 year of age.** Acute Lymphoblastic Leukemia (ALL) is the most common pediatric malignancy [1]. While the peak incidence is between **2 and 5 years**, it can occur in infants (less than 1 year of age) [1]. Infant ALL is often associated with **MLL gene rearrangements (KMT2A)** on chromosome 11q23 and generally carries a poorer prognosis compared to childhood ALL [1]. **Analysis of Incorrect Options:** * **Option A:** While Chronic Myeloid Leukemia (CML) can occur at any age, the classic peak incidence is in the **4th to 6th decades** (median age ~67). However, in the context of this question, the statement is less definitive than the biological fact of infant ALL. * **Option B:** Hairy Cell Leukemia (HCL) is a rare B-cell neoplasm typically seen in **older males** (median age ~50-55). It is exceptionally rare in patients younger than 50; therefore, stating it "generally has a good prognosis" in that specific sub-group is not a standard clinical teaching. * **Option D:** Chronic Lymphocytic Leukemia (CLL) is the most common leukemia in the Western world and is a disease of the **elderly**. The median age at diagnosis is **70 years**; it is very rarely seen in individuals younger than 40-50. **High-Yield Clinical Pearls for NEET-PG:** * **ALL:** Most common malignancy in children. Good prognosis is associated with age 1–10 years and hyperdiploidy [1]. Poor prognosis is associated with age <1 year or >10 years and the Philadelphia chromosome t(9;22) [1]. * **CLL:** Characterized by "Smudge cells" on peripheral smear and a CD5+, CD23+ B-cell phenotype. * **CML:** Characterized by the Philadelphia chromosome t(9;22) resulting in the BCR-ABL1 fusion gene. * **HCL:** Associated with **BRAF V600E** mutations and "dry tap" on bone marrow aspiration due to reticulin fibrosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 600-602.
Question 24: Microangiopathic hemolytic anemia is associated with which of the following conditions?
- A. Diabetes Mellitus
- B. Vitamin B12 deficiency
- C. Hemolytic uremic syndrome (Correct Answer)
- D. All of the above
Explanation: **Explanation:** **Microangiopathic Hemolytic Anemia (MAHA)** is a descriptive term for non-immune hemolytic anemias caused by the mechanical fragmentation of red blood cells (RBCs) as they pass through narrowed or obstructed small blood vessels [1]. **Why Hemolytic Uremic Syndrome (HUS) is correct:** In HUS (and similarly in TTP and DIC), the hallmark is the formation of **microthrombi** (platelet-rich plugs) within the microvasculature [3]. As RBCs are pushed through these partially occluded vessels by high-pressure arterial flow, they are physically sheared, leading to the formation of **schistocytes** (fragmented cells/helmet cells) [4]. This results in intravascular hemolysis, elevated LDH, and decreased haptoglobin. **Why the other options are incorrect:** * **Diabetes Mellitus:** While DM causes microvascular damage (nephropathy, retinopathy), it does not typically involve the acute formation of fibrin/platelet thrombi that cause mechanical RBC fragmentation. * **Vitamin B12 Deficiency:** This causes **Megaloblastic Anemia**, which is a macrocytic anemia due to impaired DNA synthesis. While it can cause "ineffective erythropoiesis" (intramedullary hemolysis), it does not involve microangiopathic fragmentation. **High-Yield Clinical Pearls for NEET-PG:** * **Peripheral Smear Finding:** The presence of **Schistocytes** is the pathognomonic morphological feature of MAHA. * **The Pentad of TTP:** Fever, Anemia (MAHA), Thrombocytopenia, Renal failure, and Neurological symptoms [2]. * **Differential Diagnosis of MAHA:** TTP, HUS, DIC, Malignant Hypertension, and Pre-eclampsia/HELLP syndrome. * **Coombs Test:** MAHA is always **Coombs Negative** (non-immune). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 667-668. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 947-948. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 946-947. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 540-541.
Question 25: Which of the following is not an example of a malignant disorder causing myelofibrosis?
- A. Chronic myelogenous leukemia
- B. Hairy cell leukemia
- C. Hodgkin's disease
- D. Paroxysmal nocturnal hemoglobinuria (Correct Answer)
Explanation: **Explanation:** The correct answer is **Paroxysmal nocturnal hemoglobinuria (PNH)**. Myelofibrosis (replacement of bone marrow with fibrous tissue) is a reactive process mediated by the release of fibrogenic cytokines like **TGF-β** and **PDGF** from megakaryocytes or neoplastic cells [1]. **Why PNH is the correct answer:** PNH is an acquired clonal hematopoietic stem cell disorder caused by a somatic mutation in the **PIGA gene**, leading to a deficiency of GPI-anchored proteins (CD55/CD59). While PNH is a clonal stem cell disorder, it is characterized by **intravascular hemolysis** and bone marrow failure (aplastic anemia), rather than the induction of marrow fibrosis. It is not classified as a malignant disorder that typically causes myelofibrosis. **Analysis of Incorrect Options:** * **Chronic Myelogenous Leukemia (CML):** This is a myeloproliferative neoplasm (MPN). Advanced stages (accelerated phase or blast crisis) frequently show significant secondary myelofibrosis due to cytokine release from the malignant clone [2]. * **Hairy Cell Leukemia (HCL):** This is a classic cause of "dry tap" on bone marrow aspiration. The neoplastic B-cells secrete **fibronectin**, leading to diffuse reticulin fibrosis. * **Hodgkin’s Disease:** Involvement of the bone marrow by Hodgkin lymphoma often triggers a brisk desmoplastic (fibrotic) reaction around the Reed-Sternberg cells. **NEET-PG High-Yield Pearls:** * **Primary Myelofibrosis (PMF):** Associated with JAK2 (50%), CALR, or MPL mutations [1]. * **Dry Tap on Aspiration:** Common causes include PMF, Hairy Cell Leukemia, Aplastic Anemia, and Metastatic Carcinoma. * **Silver Stain (Reticulin):** Used to grade the degree of fibrosis in the bone marrow. * **PNH Triad:** Hemolytic anemia, pancytopenia, and venous thrombosis. Diagnosis is via **Flow Cytometry** (Gold Standard). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 614-616. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 626-627.
Question 26: The Philadelphia chromosome is an example of which of the following chromosomal abnormalities?
- A. Balanced translocation (Correct Answer)
- B. Deletion
- C. Non-dysjunction
- D. Duplication
Explanation: The **Philadelphia chromosome (Ph)** is the hallmark cytogenetic abnormality of Chronic Myeloid Leukemia (CML) [1]. It results from a **balanced reciprocal translocation** between the long arms of chromosomes 9 and 22, denoted as **t(9;22)(q34;q11)** [1], [3]. ### Why Option A is Correct: In a balanced translocation, genetic material is exchanged between non-homologous chromosomes without any net loss or gain of DNA [3]. In this case, the *ABL1* proto-oncogene from chromosome 9 moves to the *BCR* (Breakpoint Cluster Region) on chromosome 22 [1]. This fusion creates the **BCR-ABL1 hybrid gene**, which encodes a constitutively active tyrosine kinase protein (p210), leading to uncontrolled cellular proliferation [2]. ### Why Other Options are Incorrect: * **B. Deletion:** This involves the loss of a chromosomal segment (e.g., 5q- syndrome). While the Ph chromosome is smaller than a normal chromosome 22, it is formed by exchange, not simple loss of material. * **C. Non-dysjunction:** This refers to the failure of homologous chromosomes or sister chromatids to separate during cell division, leading to aneuploidy (e.g., Trisomy 21). * **D. Duplication:** This involves the doubling of a specific gene or chromosomal segment [3]. ### High-Yield Clinical Pearls for NEET-PG: * **Disease Association:** Found in >95% of CML cases, 25-30% of Adult B-ALL, and 2-5% of Pediatric ALL [1]. * **Prognostic Significance:** In ALL, the presence of the Philadelphia chromosome signifies a **poor prognosis**. * **Targeted Therapy:** **Imatinib (Gleevec)**, a tyrosine kinase inhibitor (TKI), specifically targets the BCR-ABL1 protein [2]. * **Diagnosis:** Gold standard for detection is **FISH** (Fluorescence In Situ Hybridization) or **RT-PCR** for the fusion transcript [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 225-226. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 605-607. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 169-170.
Question 27: What does a low serum ferritin level indicate?
- A. Decreased capacity to absorb iron
- B. Microcytic hypochromic anemia
- C. Absent body iron stores (Correct Answer)
- D. Sideroblastic anemia
Explanation: **Explanation:** **Serum Ferritin** is the most sensitive and specific biochemical indicator of total body iron stores [1]. It reflects the amount of iron stored in the liver, spleen, and bone marrow [1]. 1. **Why Option C is Correct:** A low serum ferritin level is **pathognomonic for Iron Deficiency Anemia (IDA)**. Because ferritin levels correlate directly with the amount of storage iron, a level below the reference range (typically <15-30 ng/mL) indicates that **body iron stores are exhausted**. It is the first laboratory abnormality to appear in the progression of iron deficiency, occurring even before changes in hemoglobin or red cell indices. 2. **Why Other Options are Incorrect:** * **Option A:** Decreased absorption capacity (e.g., in Celiac disease) *causes* low iron, but ferritin specifically measures the *result* (depleted stores), not the mechanism of malabsorption itself. * **Option B:** Microcytic hypochromic anemia is a morphological description. While IDA is a cause, other conditions like Thalassemia also present this way but feature **normal or high** ferritin levels. * **Option D:** Sideroblastic anemia is characterized by iron overload and "ring sideroblasts." Here, serum ferritin is typically **elevated** due to ineffective erythropoiesis. **NEET-PG High-Yield Pearls:** * **Gold Standard:** Bone marrow aspiration (Prussian blue staining) is the gold standard for assessing iron stores, but **Serum Ferritin** is the best non-invasive screening test. * **Acute Phase Reactant:** Ferritin increases during inflammation, infection, or malignancy. In these cases, a "normal" ferritin level may mask an underlying iron deficiency (masked IDA). * **Sequence of IDA:** Depletion of stores (Low Ferritin) → Iron-deficient erythropoiesis (Low Serum Iron/High TIBC) → Iron deficiency anemia (Low Hb/Microcytosis). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 658-659.
Question 28: A 30-year-old woman complains of recent easy fatigability, bruising, and recurrent throat infections. Physical examination reveals numerous petechiae over her body and mouth. Abnormal laboratory findings include hemoglobin of 6 g/dL, WBC of 1,500/mL, and platelets of 20,000/mL. The bone marrow is hypocellular and displays increased fat. What is the appropriate diagnosis?
- A. Aplastic anemia (Correct Answer)
- B. Iron-deficiency anemia
- C. Megaloblastic anemia
- D. Leukemia
Explanation: ### Explanation **1. Why Aplastic Anemia is Correct:** The clinical presentation of easy fatigability (anemia), bruising/petechiae (thrombocytopenia), and recurrent infections (leukopenia) indicates **pancytopenia** [1]. The definitive diagnostic finding in this case is the **bone marrow biopsy**, which shows **hypocellularity** and replacement of hematopoietic elements by **increased fat (adipocytes)** [1]. Aplastic anemia is a primary bone marrow failure syndrome characterized by the depletion of hematopoietic stem cells, leading to an "empty" marrow without abnormal cell infiltration [1]. **2. Why the Other Options are Incorrect:** * **Iron-deficiency anemia:** This typically presents with isolated microcytic hypochromic anemia [3]. It does not cause pancytopenia or a hypocellular marrow; in fact, the marrow may show erythroid hyperplasia. * **Megaloblastic anemia:** While it can cause pancytopenia, the bone marrow is characteristically **hypercellular** with megaloblastic changes (e.g., nuclear-cytoplasmic asynchrony) due to ineffective hematopoiesis, not hypocellular. * **Leukemia:** Acute leukemias present with pancytopenia of normal elements, but the bone marrow is **hypercellular** due to the infiltration of malignant **blasts** (>20%), not fat [1]. **3. NEET-PG High-Yield Pearls:** * **Gold Standard Diagnosis:** Bone marrow aspiration and biopsy (shows "dry tap" and fatty replacement) [1]. * **Most Common Cause:** Idiopathic (T-cell mediated destruction of stem cells) [2]. Secondary causes include drugs (Chloramphenicol, Sulfonamides), toxins (Benzene), and viruses (Parvovirus B19, Hepatitis) [2]. * **Fanconi Anemia:** The most common inherited cause; look for thumb deformities and DNA cross-link sensitivity [2]. * **Treatment of Choice:** Bone marrow transplant (in young patients) or Immunosuppressive therapy (Antithymocyte globulin + Cyclosporine) [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 662-663. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 662. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 638-639.
Question 29: In case of Myelofibrosis, what is most likely to be seen on the peripheral blood smear?
- A. Schistocytosis
- B. Sickle cells
- C. Spherocytes
- D. Dacrocytes (Correct Answer)
Explanation: **Explanation:** **Primary Myelofibrosis (PMF)** is a myeloproliferative neoplasm characterized by progressive bone marrow fibrosis, mediated by the release of fibrogenic factors (like TGF-β) from neoplastic megakaryocytes. **Why Dacrocytes are the correct answer:** Dacrocytes, or **tear-drop shaped red blood cells**, are the hallmark of myelofibrosis [1]. As the bone marrow becomes increasingly fibrotic (collagenous), the red blood cells are physically "squeezed" and stretched as they attempt to exit the marrow through the narrowed, distorted sinusoidal spaces [1]. This mechanical trauma causes permanent deformation of the RBC membrane into a tear-drop shape. **Analysis of Incorrect Options:** * **Schistocytes (A):** These are fragmented RBCs typically seen in Microangiopathic Hemolytic Anemia (MAHA), such as TTP, HUS, or DIC, caused by mechanical shearing against fibrin strands. * **Sickle Cells (B):** These are elongated, crescent-shaped cells characteristic of Sickle Cell Anemia, resulting from the polymerization of Hemoglobin S under deoxygenated conditions [2]. * **Spherocytes (C):** These are small, dark-staining RBCs lacking central pallor, seen in Hereditary Spherocytosis or Autoimmune Hemolytic Anemia (AIHA). **NEET-PG High-Yield Pearls:** 1. **Leukoerythroblastic Blood Picture:** Myelofibrosis typically presents with immature white cells and nucleated red cells on the smear due to extramedullary hematopoiesis [1]. 2. **Dry Tap:** Bone marrow aspiration often results in a "dry tap" due to extensive fibrosis; a trephine biopsy is essential for diagnosis (showing increased reticulin/collagen). 3. **Splenomegaly:** Massive (giant) splenomegaly is a classic clinical finding due to compensatory extramedullary hematopoiesis [1]. 4. **Mutations:** Look for **JAK2 (V617F)**, CALR, or MPL mutations in clinical vignettes. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 628-629. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 644-645.
Question 30: Multiple myeloma is a tumor of which cell type?
- A. B-lymphocyte
- B. T-lymphocyte
- C. Lymph nodes
- D. Plasma cell (Correct Answer)
Explanation: **Explanation:** **Multiple Myeloma (MM)** is a neoplastic proliferation of a single clone of **plasma cells** (terminally differentiated B-cells) that typically involves the bone marrow [1]. These malignant plasma cells secrete a monoclonal (M) protein, usually IgG or IgA, which is a hallmark of the disease [1]. * **Why Option D is Correct:** Plasma cells are the effector cells of the humoral immune system. In MM, a single clone undergoes malignant transformation, leading to the overproduction of monoclonal immunoglobulins or light chains (Bence-Jones proteins) [1], [2]. * **Why Options A & B are Incorrect:** While plasma cells originate from **B-lymphocytes**, MM specifically involves the terminally differentiated stage [1]. B-cell lymphomas (like CLL or Follicular Lymphoma) involve earlier stages of B-cell development. **T-lymphocytes** are involved in cell-mediated immunity; their malignancy leads to T-cell lymphomas or leukemias, not myeloma. * **Why Option C is Incorrect:** **Lymph nodes** are anatomical structures (secondary lymphoid organs), not a cell type. While lymphomas often present as lymphadenopathy, Multiple Myeloma is primarily a bone marrow-based disease and rarely presents with significant lymph node involvement [3]. **High-Yield Clinical Pearls for NEET-PG:** * **CRAB Criteria:** **C**alcium (hypercalcemia), **R**enal insufficiency, **A**nemia, and **B**one lesions (punched-out lytic lesions) [1], [3]. * **Diagnosis:** Bone marrow biopsy showing >10% clonal plasma cells; "M-spike" on serum protein electrophoresis (SPEP) [1], [3]. * **Morphology:** "Flame cells" (IgA myeloma), "Mott cells" (Grape cells), and Russell bodies/Dutcher bodies. * **Peripheral Smear:** **Rouleaux formation** due to increased serum proteins [3]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-617. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 606-607. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 617-618.
Practice by Chapter
Anemias: Classification and Approach
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Hemolytic Anemias
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Myeloproliferative Neoplasms
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Myelodysplastic Syndromes
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Acute Leukemias
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Chronic Leukemias
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Lymphomas and Lymphoid Neoplasms
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Plasma Cell Disorders
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Bleeding Disorders
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Thrombotic Disorders
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