Hematopathology — MCQs

A 50-year-old man presents with a pruritic rash of several years' duration, characterized by erythematous, eczematoid patches and raised plaques distributed asymmetrically over the chest and abdomen. Biopsy reveals atypical CD4+ T cells with cerebriform nuclei. Further marker studies confirm a diagnosis of mycosis fungoides. Which of the following is true of this disease?

Hematopathology Indian Medical PG Practice Questions and MCQs

Question 121: A student presents for evaluation of anemia. His RDW was observed to be 13.5 while the MCV was 62.5 fl. What is the likely diagnosis?

A. Hemoglobin D Punjab (HB-D Trait)
B. Thalassemia Major
C. Iron Deficiency Anemia
D. Anemia of chronic disease (Correct Answer)

Explanation: ### Explanation The key to solving this question lies in interpreting the **RDW (Red Cell Distribution Width)** in conjunction with the **MCV (Mean Corpuscular Volume)**. **1. Why Anemia of Chronic Disease (ACD) is correct:** The patient has a low MCV (62.5 fL), indicating **microcytic anemia**. However, the RDW is **13.5%**, which is within the **normal range (11.5%–14.5%)**. In ACD, the anemia is typically normocytic but can become microcytic in long-standing cases. Crucially, the red cell population remains uniform in size, resulting in a normal RDW. This reflects a consistent defect in iron mobilization rather than a nutritional deficiency [1]. **2. Why the other options are incorrect:** * **Iron Deficiency Anemia (IDA):** This is the most common cause of microcytic anemia, but it is characterized by a **high RDW** [2]. As iron stores deplete, the marrow produces increasingly smaller cells, leading to significant anisocytosis (variation in size) [2]. * **Thalassemia Major:** Patients with Thalassemia Major present with severe microcytic anemia and a **high RDW** due to significant poikilocytosis, anisocytosis, and the presence of nucleated RBCs and fragmented cells (schistocytes) [3]. * **Hb-D Trait:** Hemoglobinopathies like Hb-D Punjab trait are usually asymptomatic with normal or near-normal RBC indices. They do not typically present with such a low MCV and normal RDW unless co-inherited with Thalassemia. **3. Clinical Pearls for NEET-PG:** * **RDW is the earliest marker** to differentiate IDA from Thalassemia Trait and ACD. * **Low MCV + Normal RDW:** Think Thalassemia Trait or ACD. * **Low MCV + High RDW:** Think Iron Deficiency Anemia [2]. * **Mentzer Index (MCV/RBC count):** If <13, it suggests Thalassemia; if >13, it suggests IDA. * **ACD Pathophysiology:** Driven by **Hepcidin**, which inhibits ferroportin, trapping iron inside macrophages and decreasing intestinal iron absorption [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 660-662. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 590-591. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 648.

Question 122: Which of the following features is characteristic of megaloblastic anemia?

A. Aplastic anemia
B. Megaloblastic anemia (Correct Answer)
C. Iron deficiency anemia
D. Leukemia

Explanation: **Megaloblastic anemia** is a macrocytic anemia characterized by a defect in DNA synthesis, most commonly due to a deficiency of **Vitamin B12 or Folic acid** [2]. The hallmark of this condition is **nuclear-cytoplasmic asynchrony**, where the nucleus matures slowly (due to impaired DNA synthesis) while the cytoplasm matures at a normal rate (as RNA and protein synthesis are unaffected) [1], [3]. This results in large, immature-looking nuclei in large cells. * **Why Option B is correct:** The presence of **hypersegmented neutrophils** (defined as >5% of neutrophils having 5 lobes or any having ≥6 lobes) and **oval macrocytes** on a peripheral smear are pathognomonic features of megaloblastic anemia [1], [2]. * **Why Option A is incorrect:** Aplastic anemia is a **normocytic, normochromic** anemia characterized by pancytopenia due to bone marrow failure, not a defect in DNA maturation. * **Why Option C is incorrect:** Iron deficiency anemia is a **microcytic, hypochromic** anemia caused by a defect in hemoglobin synthesis, not DNA synthesis. * **Why Option D is incorrect:** While some leukemias (like AML-M6) can show megaloblastoid changes, leukemia is primarily characterized by the uncontrolled proliferation of blast cells and a "leukemic gap," rather than the specific maturation defect seen in megaloblastic anemia [4]. **High-Yield NEET-PG Pearls:** 1. **Earliest sign of response** to treatment in megaloblastic anemia is a rise in **Reticulocyte count**. 2. **Earliest sign of Vitamin B12 deficiency** is the appearance of **Hypersegmented Neutrophils** [2]. 3. **Howell-Jolly bodies** (nuclear remnants) are frequently seen due to abnormal nuclear maturation. 4. **Schilling test** (historically) was used to differentiate the cause of B12 malabsorption. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 593-594. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 654. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 654-655. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 613-614.

Question 123: Which of the following is NOT typically seen in multiple myeloma?

A. Anion gap raised (Correct Answer)
B. Lytic bone lesion
C. Polyarticular pains
D. M spike present with polyarticulopathy

Explanation: In Multiple Myeloma (MM), the characteristic finding is a **decreased (low) anion gap**, not a raised one. This occurs because the monoclonal M-proteins (IgG) are cationic (positively charged) at physiological pH. To maintain electroneutrality, there is an increase in chloride and bicarbonate (anions) in the serum, which mathematically reduces the calculated anion gap [AG = Na - (Cl + HCO3)]. **Explanation of Options:** * **Option A (Correct):** As explained, MM typically presents with a **low anion gap**. A raised anion gap is usually associated with metabolic acidosis (e.g., renal failure), but the specific paraproteinemia effect in MM pushes the gap downward. * **Option B:** **Lytic bone lesions** are a hallmark of MM, caused by the activation of osteoclasts via RANKL signaling and the inhibition of osteoblasts [1]. These "punched-out" lesions are most common in the skull and vertebrae [1], [2]. * **Option C & D:** While MM primarily affects bone, it can present with **polyarticulopathy** or joint pains. This is often due to **AL Amyloidosis** (deposition of light chains in joints/synovium) [3] or pathological fractures near joint spaces. The presence of an **M-spike** (monoclonal gammopathy) on serum protein electrophoresis (SPEP) is the diagnostic gold standard [3]. **High-Yield Clinical Pearls for NEET-PG:** * **CRAB Criteria:** **C**alcium (High), **R**enal insufficiency, **A**nemia, **B**one lesions [2]. * **Blood Film:** **Rouleaux formation** (due to decreased zeta potential between RBCs) [2]. * **Urine:** **Bence-Jones proteins** (detected by sulfosalicylic acid test, not standard dipstick) [2]. * **Bone Marrow:** >10% clonal plasma cells; "Mott cells" or "Flame cells" may be seen [2]. **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, p. 608. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-619. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 266-267.

Question 124: Which of the following is an immune response cause of anemia?

A. Diamond Blackfan anemia
B. Hereditary spherocytosis
C. Glucose-6-phosphate dehydrogenase deficiency
D. Hemolytic disease of the newborn (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Hemolytic disease of the newborn (HDN)** **Why it is correct:** Hemolytic disease of the newborn (also known as Erythroblastosis Fetalis) is a classic example of a **Type II hypersensitivity reaction**. It occurs when maternal IgG antibodies cross the placenta and attack fetal red blood cells (RBCs) that carry antigens inherited from the father (most commonly RhD or ABO antigens) [1]. This **immune-mediated destruction** leads to hemolysis, resulting in anemia, jaundice, and in severe cases, hydrops fetalis [2]. **Why the other options are incorrect:** * **A. Diamond Blackfan anemia:** This is a **congenital pure red cell aplasia** caused by intrinsic defects in ribosomal proteins (e.g., RPS19). It is a failure of erythropoiesis, not an immune-mediated destruction. * **B. Hereditary spherocytosis:** This is a **genetic defect in RBC membrane proteins** (most commonly Ankyrin, followed by Spectrin). The anemia results from structural instability of the membrane, leading to splenic sequestration. * **C. G6PD deficiency:** This is an **X-linked enzymopathy**. Anemia occurs due to oxidative stress (e.g., from fava beans or drugs) which causes hemoglobin to denature into Heinz bodies, leading to non-immune hemolysis. **High-Yield Clinical Pearls for NEET-PG:** * **Direct Antiglobulin Test (Coombs Test):** Positive in HDN (immune-mediated), but negative in Hereditary Spherocytosis and G6PD deficiency (non-immune) [2]. * **Rh Incompatibility:** Usually affects the second pregnancy onwards (requires sensitization) [3]. * **ABO Incompatibility:** Can affect the first pregnancy; typically occurs in mothers with blood group O and infants with group A or B [1]. * **Morphology:** Look for **nucleated RBCs** (erythroblasts) and polychromasia on the peripheral smear of the neonate [4]. **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. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 470-472.

Question 125: Gum hyperplasia is seen with which of the following hematological malignancies?

A. Acute Myeloid Leukemia (AML) (Correct Answer)
B. Chronic Myeloid Leukemia (CML)
C. Acute Lymphoblastic Leukemia (ALL)
D. Chronic Lymphocytic Leukemia (CLL)

Explanation: **Explanation:** **1. Why Acute Myeloid Leukemia (AML) is correct:** Gum hyperplasia (gingival hypertrophy) is a classic clinical sign associated with specific subtypes of AML, most notably those with **monocytic differentiation** [1]. Under the FAB classification, these are **AML-M4 (Acute Myelomonocytic Leukemia)** and **AML-M5 (Acute Monocytic Leukemia)** [2]. The underlying mechanism involves the infiltration of malignant monoblasts and monocytes into the gingival tissues. These cells have a high propensity for extra-medullary tissue invasion due to the expression of specific adhesion molecules. **2. Why the other options are incorrect:** * **Chronic Myeloid Leukemia (CML):** Typically presents with massive splenomegaly and constitutional symptoms (fever, weight loss). While it involves myeloid cells, it does not characteristically infiltrate the gums. * **Acute Lymphoblastic Leukemia (ALL):** More common in children; it typically presents with bone pain, lymphadenopathy, and hepatosplenomegaly. While it can cause CNS or testicular involvement, gingival hyperplasia is rare. * **Chronic Lymphocytic Leukemia (CLL):** Primarily a disease of the elderly characterized by absolute lymphocytosis and "smudge cells." It rarely shows extra-nodal tissue infiltration like the gums. **3. High-Yield Clinical Pearls for NEET-PG:** * **FAB M4 & M5:** Always associate these with **Gingival Hyperplasia**, skin involvement (**Leukemia Cutis**), and CNS involvement. * **Cytochemistry:** AML-M4 and M5 are characterized by **Non-Specific Esterase (NSE) positivity**, which is inhibited by sodium fluoride. * **Differential Diagnosis:** Other causes of gum hyperplasia include drugs like **Phenytoin, Cyclosporine, and Nifedipine** (Calcium Channel Blockers), as well as Scurvy (Vitamin C deficiency). **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. 620-621. [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. 621-622.

Question 126: M protein on immunoelectrophoresis in multiple myeloma patients is most commonly formed by?

A. IgM
B. IgG (Correct Answer)
C. IgA
D. IgD

Explanation: **Explanation:** Multiple Myeloma is a plasma cell dyscrasia characterized by the neoplastic proliferation of a single clone of plasma cells [1]. These cells secrete a monoclonal immunoglobulin or a fragment thereof, known as the **M protein** (Myeloma protein) or **paraprotein**, which appears as a sharp "M spike" on serum protein electrophoresis (SPEP) [3]. **Why IgG is Correct:** In Multiple Myeloma, the most frequently produced monoclonal immunoglobulin is **IgG**, accounting for approximately **50-60%** of all cases [1]. This is followed by IgA [1]. The heavy chain is most commonly coupled with the kappa (κ) light chain [3]. **Analysis of Incorrect Options:** * **IgA (Option C):** This is the second most common type, seen in about **20-25%** of cases [1]. It is often associated with more frequent hypercalcemia and extramedullary involvement. * **IgM (Option A):** Monoclonal IgM spikes are rare in Multiple Myeloma [1]. A significant IgM spike is the hallmark of **Waldenström Macroglobulinemia**, not Multiple Myeloma [3]. * **IgD (Option D):** This is a rare variant (<2% of cases) and is often associated with a worse prognosis and a higher incidence of Bence-Jones proteinuria and renal failure [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Frequency Order:** IgG (50-60%) > IgA (20-25%) > Light chain only (15%) > IgD (2%) > IgE (rare) [1]. * **Bence-Jones Proteins:** These are free monoclonal light chains (kappa or lambda) found in the urine; they precipitate at 40-60°C and redissolve at 100°C. * **Diagnosis:** Requires ≥10% clonal plasma cells in bone marrow plus **CRAB** features (Calcium elevation, Renal insufficiency, Anemia, Bone lesions). * **Peripheral Smear:** Characterized by **Rouleaux formation** due to increased serum proteins decreasing the zeta potential of RBCs [2]. **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. 608-609. [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. 607-608. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-617.

Question 127: Reed-Sternberg cells are seen in the histopathological examination of which condition?

A. African jaw lymphoma
B. Hodgkin's disease (Correct Answer)
C. Burkitt's lymphoma
D. Infectious mononucleosis

Explanation: **Explanation:** **Reed-Sternberg (RS) cells** are the hallmark diagnostic feature of **Hodgkin’s Lymphoma (HL)** [2]. These are large, multinucleated or bilobed cells with prominent, eosinophilic, "owl-eye" nucleoli [1]. They are derived from germinal center B-cells and are typically surrounded by a reactive background of non-neoplastic inflammatory cells (lymphocytes, plasma cells, and eosinophils) [2]. **Analysis of Options:** * **Hodgkin’s Disease (Correct):** RS cells are essential for the diagnosis [2]. The classical immunophenotype is **CD15+ and CD30+**, but CD45 negative. * **Burkitt’s Lymphoma & African Jaw Lymphoma (Incorrect):** These are the same entity (African jaw lymphoma is the endemic variant). Histologically, they show a **"Starry Sky" appearance** caused by tingible body macrophages against a sea of small, uniform B-cells. They are associated with the **t(8;14)** translocation and c-MYC overexpression. * **Infectious Mononucleosis (Incorrect):** While "RS-like" cells (atypical activated T-cells or Downey cells) can occasionally be seen in this EBV-driven condition, they are not true RS cells. Clinical presentation includes fever, sore throat, and lymphadenopathy with a positive Monospot test. **High-Yield Clinical Pearls for NEET-PG:** * **Variants of RS Cells:** * *Lacunar cells:* Seen in Nodular Sclerosis HL [1]. * *Popcorn cells (L&H cells):* Seen in Nodular Lymphocyte Predominant HL (CD20+, CD45+, but CD15- and CD30-) [3]. * *Mummified cells:* Degenerated RS cells seen in Mixed Cellularity HL. * **Bimodal Age Distribution:** HL typically peaks in the 20s and again after age 50 [2]. * **Prognosis:** Lymphocyte Predominant has the best prognosis [3]; Lymphocyte Depleted has the worst. **Additional Historical Detail:** The condition, originally described by Thomas Hodgkin, was later characterized by the presence of these giant cells identified by Sternberg and Reed [4]. **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, p. 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. 614-616. [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, p. 618. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 556-557.

Question 128: Alkaline phosphatase is specific to which of the following cells?

A. Eosinophils
B. Neutrophils (Correct Answer)
C. Polymorphs
D. Basophils

Explanation: **Explanation:** The correct answer is **Neutrophils**. **Underlying Medical Concept:** Leukocyte Alkaline Phosphatase (LAP) is an enzyme located within the secondary (specific) granules of mature neutrophils [1]. It is a biochemical marker used to assess the maturity and activation state of the myeloid lineage. The LAP score (or Neutrophil Alkaline Phosphatase - NAP score) is clinically significant in hematopathology to differentiate between a **Leukemoid Reaction** (where the score is high due to mature, activated neutrophils) and **Chronic Myeloid Leukemia (CML)** (where the score is characteristically low or zero because the malignant cells are enzymatically deficient) [2]. **Analysis of Options:** * **Neutrophils (B):** This is the most specific answer. LAP activity is found in mature neutrophils, band forms, and metamyelocytes [1]. * **Polymorphs (C):** While "polymorphs" is often used interchangeably with neutrophils, the term technically includes all granulocytes (eosinophils and basophils). Since LAP is absent in those cells, "Neutrophils" is the more precise and correct choice. * **Eosinophils (A) & Basophils (D):** These granulocytes do not contain alkaline phosphatase in their granules. **High-Yield Clinical Pearls for NEET-PG:** * **LAP Score ↑ (High):** Leukemoid reaction, Polycythemia Vera, Pregnancy, and Stress/Infections. * **LAP Score ↓ (Low):** Chronic Myeloid Leukemia (CML), Paroxysmal Nocturnal Hemoglobinuria (PNH), and Hypophosphatasia. * **Stain used:** Kaplow’s method (Azo-dye coupling technique). * **Scoring:** 100 mature neutrophils are graded from 0 to 4+ based on intensity; the normal range is typically 40–100. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 579-580. [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. 624-625.

Question 129: What anticoagulant is added to blood for the estimation of prothrombin time?

A. Heparin
B. Oxalate
C. Sodium citrate (Correct Answer)
D. EDTA

Explanation: **Explanation:** The correct answer is **Sodium Citrate (3.2%)**. **Why Sodium Citrate is the choice for PT:** Prothrombin Time (PT) and Activated Partial Hypothetical Time (aPTT) are coagulation studies. Sodium citrate acts as an anticoagulant by **chelating (binding) calcium ions**, which are essential cofactors in the coagulation cascade [1]. It is the preferred agent because its effect is easily reversible by adding calcium back to the plasma during the test [1]. For coagulation studies, a specific **ratio of 9:1 (Blood:Anticoagulant)** is maintained in a **light blue-top tube**. **Why other options are incorrect:** * **Heparin:** It acts by activating Antithrombin III, which inhibits Thrombin and Factor Xa. It is used for arterial blood gases (ABG) but interferes with coagulation assays and causes platelet aggregation. * **Oxalate:** While it also chelates calcium, it is more toxic and can distort cellular morphology. It is primarily used (as Potassium Oxalate) in grey-top tubes for glucose estimation (along with Sodium Fluoride). * **EDTA:** This is the gold standard for Hematology (CBC/ESR) because it preserves cell morphology. However, it is not used for PT because it irreversibly inhibits certain clotting factors (like Factor V and VIII) and interferes with the endpoint detection. **High-Yield Clinical Pearls for NEET-PG:** * **Concentration:** 3.2% (0.109 mol/L) sodium citrate is recommended over 3.8% to avoid falsely prolonged PT results in patients with high hematocrit. * **Polycythemia Correction:** If the patient's hematocrit is >55%, the amount of citrate in the tube must be reduced to ensure accurate results. * **Tube Color Coding:** Sodium Citrate = Light Blue; EDTA = Lavender; Heparin = Green; Fluoride/Oxalate = Grey. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 128-130.

Question 130: A 50-year-old man presents with a pruritic rash of several years' duration, characterized by erythematous, eczematoid patches and raised plaques distributed asymmetrically over the chest and abdomen. Biopsy reveals atypical CD4+ T cells with cerebriform nuclei. Further marker studies confirm a diagnosis of mycosis fungoides. Which of the following is true of this disease?

A. The disease eventually disseminates to lymph nodes and internal organs. (Correct Answer)
B. The neoplastic cells most commonly display cell markers of CD19 and CD20.
C. The skin rash most commonly disappears over time.
D. This disease is caused by a chronic fungal infection in the skin.

Explanation: **Explanation:** **Mycosis Fungoides (MF)** is the most common type of **Cutaneous T-Cell Lymphoma (CTCL)**. It is a primary skin malignancy arising from skin-homing **CD4+ helper T cells** [1]. 1. **Why Option A is Correct:** MF typically follows a chronic, indolent course progressing through three stages: **Patch, Plaque, and Tumor** [3]. While it remains localized to the skin for years, in advanced stages, the neoplastic T cells lose their skin-homing properties and **disseminate systemically** to the regional lymph nodes, bone marrow, and internal organs (liver, spleen, lungs) [1]. 2. **Why Incorrect Options are Wrong:** * **Option B:** MF is a T-cell malignancy. CD19 and CD20 are B-cell markers. The characteristic phenotype is **CD3+ and CD4+** [2]. * **Option C:** The rash is progressive, not self-limiting. Without treatment, patches evolve into infiltrated plaques and eventually into fungating tumors [1]. * **Option D:** Despite the name "Mycosis," the disease is a **neoplasm**, not a fungal infection. The name historically refers to the mushroom-like appearance of the skin tumors. **High-Yield Clinical Pearls for NEET-PG:** * **Pautrier Microabscesses:** Pathognomonic histological finding characterized by aggregates of atypical T cells within the epidermis [3]. * **Cerebriform Nuclei:** The neoplastic cells (Lutzner cells) have highly infolded, "brain-like" nuclear membranes [2]. * **Sézary Syndrome:** The leukemic phase of CTCL characterized by the triad of **erythroderma** (generalized redness), **lymphadenopathy**, and **circulating cerebriform T cells (Sézary cells)** [3]. * **Epidermotropism:** The hallmark tendency of these malignant T cells to migrate into the epithelial layer [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, p. 1162. [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. [3] 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.

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