Hematopathology Practice Questions

Q: Which of the following is typically expected in a case of Microcytic Hypochromic anemia?

Reduced serum Iron. ***Reduced total RBC distribution width*** - Microcytic hypochromic anemia typically shows **increased RBC distribution width (RDW)** due to varied sizes of red blood cells, indicating a diverse population in response to microcytic anemia [1]. - A **reduced RDW** would suggest a more uniform red blood cell population, which is not characteristic of this type of anemia. *Normal Ferritin levels* - Ferritin levels are usually **low** in microcytic hypochromic anemia, indicating **iron deficiency** [1]. - Normal ferritin might suggest other types of anemia rather than the iron deficiency expected in microcytic anemia. *Reduced serum Iron* - Serum iron is generally **low** in microcytic hypochromic anemia due to **iron deficiency**, making this an expected finding [1]. - The presence of reduced serum iron supports the diagnosis and is not inconsistent with this type of anemia. *Increased TIBC* - TIBC (Total Iron Binding Capacity) is typically **increased** in microcytic anemia due to low iron stores, reflecting the body's attempt to maximize iron uptake. - An increased TIBC aligns with iron deficiency anemia, which is a common cause of microcytic hypochromic anemia [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591.

Q: Which type of anemia is most commonly characterized by marked poikilocytosis and anisocytosis on peripheral blood smear?

Iron deficiency anemia. ***Iron deficiency anaemia*** - Characterized by **poikilocytosis** (abnormal shapes) and **anisocytosis** (variation in red blood cell sizes), which are common findings in iron deficiency [1]. - Typically results in **microcytic hypochromic anemia** [1], distinguishing it from other types of anemia. *Nutritional deficiency anaemia* - May present with various blood cell morphology but does not specifically exhibit **poikilocytosis** and **anisocytosis** characteristic of iron deficiency anemia. - Usually includes deficiencies like **vitamin B12** or **folate**, which result in **macrocytic anemia** instead. *Megaloblastic anaemia* - Primarily caused by deficiency of **vitamin B12** or **folate**, leading to large, immature red blood cells (megaloblasts) rather than varied shapes and sizes. - Associated with **hypersegmented neutrophils** in the blood smear, which differentiates it from iron deficiency anemia. *Thalassemia* - Characterized by **microcytic hypochromic red blood cells** and often involves **target cells** rather than generalized poikilocytosis and anisocytosis. - Typically presents with **hemolytic anemia** but does not show the same variability in cell shapes and sizes as seen in iron deficiency anemia. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591.

Q: Which tumor is characterized by the presence of cells that resemble tennis rackets?

Langerhans cell histiocytosis. ***Langerhans cell histiocytosis*** - This condition is characterized by **Birbeck granules** within the Langerhans cells, which have a distinctive **tennis racket-like appearance** on electron microscopy. - The cells are also positive for **CD1a** and **S-100** immunohistochemical markers. *Sarcoma botyroides* - This is a subtype of **embryonal rhabdomyosarcoma** typically found in mucosal sites, presenting as a polypoid, grape-like mass. - Its histology shows small, undifferentiated cells with primitive skeletal muscle differentiation, but **not tennis racket-shaped cells**. *Vaginal adenocarcinoma* - This is a rare malignancy of the vagina, often associated with **diethylstilbestrol (DES) exposure** in utero, presenting as glands. - The cells show glandular differentiation and produce mucin, but **lack Birbeck granules**. *Seminoma* - This is a germ cell tumor of the testis characterized by large, uniform cells with clear cytoplasm and prominent nucleoli, divided into lobules by fibrous septa containing lymphocytes. - There are **no tennis racket-shaped cells** or Birbeck granules associated with seminoma.

Q: Which of the following is NOT seen in polycythemia vera?

Increased erythropoietin. ***Increased erythropoietin*** - In polycythemia vera, patients usually exhibit **low erythropoietin levels** due to feedback inhibition from increased red blood cell mass. - The condition is driven by a **myeloproliferative disorder** [2], not by increased erythropoietin stimulation. *Most common cause of polycythemia* - This option is incorrect because polycythemia vera is specifically a type of **primary polycythemia** [1], rather than the most common cause, which is often **secondary causes** such as hypoxia or abnormal erythropoietin production. - Other causes including chronic lung disease or renal tumors are more prevalent sources of increased red blood cell production. *Intrinsic abnormality of hematopoietic precursors* - While polycythemia vera indeed involves an **abnormality in hematopoietic stem cells** [1], it is not the only mechanism leading to polycythemia; many cases have secondary causes. - Hence, this option misrepresents the specific and more accurate characterization of polycythemia vera. *Erythropoietin independent growth of red cell progenitors* - Polycythemia vera is associated with **erythropoietin-independent** proliferation of hematopoietic cells [2], which is characteristic of the condition due to mutations in **JAK2** [2,3]. - This accurately reflects a significant feature of the disease, aligning closely with the pathophysiology. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 663-664. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 614-615. [3] 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.

Q: What is a distinguishing feature of reticulocytes?

Presence of residual RNA and ribosomes. ***Presence of residual RNA and ribosomes*** - This is the **defining and most distinguishing feature** of reticulocytes that differentiates them from mature red blood cells. - Reticulocytes contain residual **ribosomal RNA** and other organelles that are lost when they mature into erythrocytes. - This residual RNA forms a **reticular (network-like) pattern** when stained with supravital stains like **new methylene blue** or **brilliant cresyl blue**, which is the basis for their name and identification. - The presence of RNA allows for **reticulocyte counting**, an important marker of bone marrow erythropoietic activity. *Slightly larger in size than RBCs* - While reticulocytes may be slightly larger (polychromatophilic appearance), size variation is **not specific** and overlaps significantly with mature RBCs. - Size is not a reliable distinguishing feature and is not used for identification or counting. *Mature in bone marrow* - Reticulocytes are **released from the bone marrow** as immature red cells and complete their maturation in the **peripheral circulation** over 24-48 hours. - They do not fully mature in the bone marrow; their presence in peripheral blood is normal. *Constitute approximately 1% of the red cells* - Normal reticulocyte count is **0.5-2%** (or approximately 1%) of total red blood cells in healthy adults. - This is a **population characteristic** indicating normal erythropoietic activity, not a distinguishing cellular feature.

Q: Which of the following statements is true regarding the Duffy Fy(a-b-) blood group?

lacks Fy(b) antigen. ***lacks Fy(b) antigen*** - The **Duffy Fy(a-b-)** phenotype indicates absence of both Fy a and Fy b antigens on red blood cells. - Since the phenotype is **Fy(a-b-)**, it definitively lacks the **Fy b antigen** (indicated by the "b-" notation). - This phenotype is common in people of **African descent** and confers natural **resistance to Plasmodium vivax malaria**, as these antigens serve as receptors for the parasite to enter RBCs. *lacks H- antigen* - The **H antigen** belongs to the **H/h blood group system** and is a precursor to A and B antigens in the ABO system. - The absence of H antigen (Bombay phenotype - Oh) is completely **unrelated to the Duffy blood group system**. - Duffy antigens are on the **DARC (Duffy Antigen Receptor for Chemokines)** protein, distinct from the H antigen. *lacks A-antigen* - The **A antigen** is part of the **ABO blood group system** and defines blood types A and AB. - The Duffy blood group system is **genetically and structurally independent** from the ABO system. - Having Fy(a-b-) phenotype does not affect A antigen expression. *All of the options* - This is incorrect because the Duffy Fy(a-b-) phenotype **specifically refers only to the absence of Duffy antigens** (Fy a and Fy b ). - It has **no relationship** with A, B, or H antigens, which belong to different blood group systems controlled by different genes on different chromosomes.

Q: Shelf life of platelets in a blood bank is

5 days. **5 days** - Platelets stored at **room temperature (20-24°C)** have a limited shelf life due to the risk of bacterial contamination and metabolic changes. - This short storage period ensures the **viability and function** of platelets for transfusion. *7 days* - A 7-day shelf life was initially proposed but was not widely adopted due to concerns about increased **bacterial growth** and the practical challenges of extended storage at room temperature. - The risk of **bacterial sepsis** significantly increases with longer room temperature storage. *10 days* - This duration is beyond the currently accepted shelf life for platelets, leading to an unacceptably high risk of **bacterial contamination** and reduced therapeutic efficacy. - Storing platelets for 10 days would likely result in an increased incidence of **transfusion-associated sepsis**. *21 days* - A shelf life of 21 days is typical for **red blood cells** when stored at 1-6°C with specific anticoagulants, but it is far too long for platelets. - Platelets stored for this duration at room temperature would be significantly **non-viable** and pose a severe risk of bacterial infection.

Q: Sezary cells show which type of nucleus?

Cerebriform. ***Cerebriform*** - **Sezary cells** are characterized by their distinctive **cerebriform nuclei**, giving them an irregular, convoluted appearance [1,2]. - This finding is a hallmark of **cutaneous T-cell lymphoma** and emphasizes their potential malignancy [1,2]. *Round* - Round nuclei do not reflect the typical morphology of **Sezary cells**, which are noted for their **irregular shape**. - Other lymphocytes may exhibit round nuclei, but this does not specifically indicate a **Sezary cell** presence. *Pleomorphic* - While some malignant cells might show **pleomorphic nuclei**, Sezary cells uniquely showcase **cerebriform nuclei** rather than varying shapes [1,2]. - Pleomorphic is not a defining characteristic of **Sezary cells**, making this description inaccurate. *Eosinophillic* - Eosinophilic refers to cells that stain positively for **eosin**, typically associated with **eosinophils**, which is not relevant to **Sezary cells**. - Sezary cells are more about their **nuclear morphology** and less about eosinophilic staining characteristics. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 564-565. [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. 613-614.

Q: Osmotic fragility test is commonly used for which of the following conditions?

Hereditary spherocytosis. ***Hereditary spherocytosis*** - The **osmotic fragility test** helps in diagnosing hereditary spherocytosis, where **spherical red blood cells** are more prone to hemolysis in hypotonic solutions [1][2]. - This condition is characterized by **spherocytes** (abnormally shaped RBCs) leading to increased osmotic fragility [1][3]. *Megaloblastic anemia* - Megaloblastic anemia is primarily associated with **deficiencies in B12 or folate**, affecting the size and maturation of red blood cells, not their osmotic fragility. - The diagnosis focuses on **serum vitamin levels** and **bone marrow examination** rather than osmotic fragility. *Iron deficiency anemia* - Iron deficiency anemia features **microcytic** and **hypochromic RBCs**, and its diagnosis relies on **iron studies**, not osmotic fragility tests. - The osmotic fragility test does not reveal significant changes in red blood cells for this condition. *Aplastic anemia* - Aplastic anemia involves **pancytopenia** due to bone marrow failure and does not typically show altered osmotic fragility. - The diagnosis is confirmed through **bone marrow biopsy**, not by assessing osmotic fragility. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 597-598. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 640-641. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 638.

Q: Which of the following does not predispose to leukemia?

Alcohol. ***Alcohol*** - Alcohol consumption does not have a well-established association with an increased risk of leukemia compared to other factors. - While excessive alcohol can impact overall health, it is not considered a primary risk factor for developing leukemia. *Chemical exposure* - Certain chemicals, such as **benzene** and **formaldehyde**, are known to be **leukemogenic** and can increase the risk of leukemia. [1] - Occupational exposure to these chemicals has been linked to **acute myeloid leukemia (AML)** and other types of leukemia. [1] *Smoking* - Smoking has been clearly associated with an increased risk of **acute myeloid leukemia (AML)** and other hematologic malignancies. [1] - The toxins in tobacco smoke can cause **DNA damage**, contributing to the development of leukemia. *Genetic disorder* - Certain genetic disorders, like **Down syndrome** and **Fanconi anemia**, are associated with an increased risk of leukemia. - Individuals with these genetic predispositions have a higher likelihood of developing various forms of leukemia.

Question 1

Which of the following is typically expected in a case of Microcytic Hypochromic anemia?

Accepted Answer

Reduced serum Iron

Answer

Normal Ferritin levels

Answer

Increased TIBC

Answer

Increased total RBC distribution width

Question 2

Which type of anemia is most commonly characterized by marked poikilocytosis and anisocytosis on peripheral blood smear?

Accepted Answer

Iron deficiency anemia

Answer

Megaloblastic anemia

Answer

Nutritional anemia

Answer

Thalassemia

Question 3

Which tumor is characterized by the presence of cells that resemble tennis rackets?

Accepted Answer

Langerhans cell histiocytosis

Answer

Seminoma

Answer

Vaginal adenocarcinoma

Answer

Sarcoma botyroides

Question 4

Which of the following is NOT seen in polycythemia vera?

Accepted Answer

Increased erythropoietin

Answer

Intrinsic abnormality of hematopoietic precursors

Answer

Erythropoietin independent growth of red cell progenitors

Answer

Most common cause of primary polycythemia

Question 5

What is a distinguishing feature of reticulocytes?

Accepted Answer

Presence of residual RNA and ribosomes

Answer

Slightly larger in size than RBCs

Answer

Mature in bone marrow

Answer

Constitute approximately 1% of the red cells

Question 6

Which of the following statements is true regarding the Duffy Fy(a-b-) blood group?

Accepted Answer

lacks Fy(b) antigen

Answer

lacks H- antigen

Answer

lacks A-antigen

Answer

All of the options

Question 7

Shelf life of platelets in a blood bank is

Accepted Answer

5 days

Answer

7 days

Answer

10 days

Answer

21 days

Question 8

Sezary cells show which type of nucleus?

Accepted Answer

Cerebriform

Answer

Pleomorphic

Answer

Round

Answer

Eosinophilic

Question 9

Osmotic fragility test is commonly used for which of the following conditions?

Accepted Answer

Hereditary spherocytosis

Answer

Megaloblastic anemia

Answer

Aplastic anemia

Answer

Iron deficiency anemia

Question 10

Which of the following does not predispose to leukemia?

Accepted Answer

Alcohol

Answer

Smoking

Answer

Chemical exposure

Answer

Genetic disorder

Hematopathology — MCQs

Hematopathology — MCQs

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