NEET-PG 2017 — Pathology

Q: A 70-year-old man presents with painless cervical lymphadenopathy with progressive pallor and petechiae on ankles. Peripheral smear shows presence of:

CLL. ***CLL*** - The presentation of **painless cervical lymphadenopathy**, progressive **pallor** (due to anemia), and **petechiae** (due to thrombocytopenia) in an elderly patient is highly suggestive of **Chronic Lymphocytic Leukemia (CLL)** [2]. - Peripheral smear in CLL typically shows a proliferation of mature-appearing **small lymphocytes** and characteristic **smudge cells** [1]. *Acute ITP* - Acute ITP is characterized by sudden onset of **thrombocytopenia** and bleeding, often following a viral infection, and is more common in children. - It does not typically present with **lymphadenopathy** or progressive pallor as a primary feature. *Chronic ITP* - Chronic ITP is characterized by isolated **thrombocytopenia** and bleeding symptoms, usually without lymphadenopathy or significant anemia unless bleeding is severe. - The presence of **lymphadenopathy** points away from isolated ITP and towards a systemic hematological malignancy. *Richter syndrome* - Richter syndrome is the transformation of CLL into a more aggressive lymphoma, most commonly **diffuse large B-cell lymphoma (DLBCL)**. - While it can present with rapidly enlarging lymph nodes and systemic symptoms, the initial presentation described (painless lymphadenopathy, progressive pallor, petechiae) is more typical of **untreated CLL** before transformation [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. 602. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 612-613. [Practice more Pathology PYQs on OnCourse]

Q: Identify the cell.

Monocyte. ***Monocyte*** - Monocytes are characterized by their **large size** (12-20 µm), **kidney-shaped or horseshoe-shaped nucleus**, and **abundant, often grayish-blue cytoplasm** with fine azurophilic granules [1]. - They are precursors to **macrophages** and play a crucial role in phagocytosis and antigen presentation [1]. *Eosinophil* - Eosinophils have a **bilobed nucleus** and prominent **red-orange granules** in their cytoplasm, which stain with eosin [1]. - They are primarily involved in allergic reactions and defense against **parasitic infections** [1]. *Basophil* - Basophils are characterized by a **lobed nucleus** often obscured by large, coarse, **dark purple-blue granules** that contain histamine and heparin [1]. - They are the least common granulocyte and are involved in **allergic and inflammatory responses** [1]. *Lymphocyte* - Lymphocytes are typically **smaller** than monocytes, with a **large, round, or slightly indented nucleus** that occupies most of the cell [1]. - Their cytoplasm is usually **scanty and pale blue**, often appearing as a thin rim around the nucleus [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 578-580. [Practice more Pathology PYQs on OnCourse]

Q: Name the test given.

ESR measurement. ***ESR measurement*** - The image displays a **Westergren tube** with a column of blood, showing distinct layers of plasma on top and red blood cells settled below against a calibrated scale. - This setup is characteristic of an **Erythrocyte Sedimentation Rate (ESR)** test, which measures the rate at which red blood cells fall in a standardized tube over a specific time, indicating inflammation. *Osmotic fragility* - This test involves exposing red blood cells to varying concentrations of **hypotonic saline solutions** to assess their resistance to lysis. - The results are typically reported as a curve showing the percentage of hemolysis at different saline concentrations, not a simple sedimentation in a tube. *NESTROFT* - The **Naked Eye Single Tube Red Cell Osmotic Fragility Test (NESTROFT)** is a quick screening test for **beta-thalassemia trait**. - It involves mixing blood with a hypotonic saline solution and observing for complete hemolysis or partial hemolysis with a button of red cells, which is different from the image shown. *Sickling test* - A sickling test is used to detect the presence of **sickle hemoglobin**, which causes red blood cells to deform into a sickle shape under low oxygen conditions. - This test is usually performed by adding a reducing agent like **sodium metabisulfite** to a blood sample and observing cell morphology under a microscope or by turbidity, not by sedimentation in a calibrated tube. *Packed cell volume (PCV)* - PCV or **hematocrit** measures the proportion of blood volume occupied by red blood cells after centrifugation in a **microhematocrit tube**. - While it does involve blood in a tube, the tube is much smaller (capillary tube) and requires **centrifugation** to separate components, unlike ESR which relies on natural sedimentation under gravity in a larger calibrated Westergren tube. [Practice more Pathology PYQs on OnCourse]

Q: Name the anticoagulant used in the following method.

Trisodium citrate. ***Trisodium citrate*** - The image displays a method for measuring **Erythrocyte Sedimentation Rate (ESR)**, typically performed using the **Westergren method**. - In the Westergren method, **trisodium citrate** is the standard anticoagulant used to prevent blood coagulation, allowing red blood cells to settle over time. *EDTA* - **EDTA (ethylenediaminetetraacetic acid)** is a common anticoagulant, primarily used for **hematology tests** such as complete blood counts (CBC), as it preserves cell morphology. - While it prevents clotting, it is not the standard anticoagulant for the Westergren ESR method, as it can cause red blood cell shrinkage affecting sedimentation. *Heparin* - **Heparin** acts as an anticoagulant by enhancing the activity of **antithrombin III**, and is commonly used for chemistry and general coagulation studies. - It interferes with the sedimentation rate in ESR measurements, making it unsuitable for this specific test. *Dalteparin* - **Dalteparin** is a type of **low molecular weight heparin (LMWH)** used therapeutically as an anticoagulant to prevent and treat blood clots. - It is not used as an in-vitro anticoagulant for blood collection tubes or lab diagnostic tests like ESR. *Sodium fluoride* - **Sodium fluoride** is an anticoagulant and enzymatic inhibitor primarily used for **glucose measurement**, as it inhibits glycolysis and preserves glucose levels. - It is not appropriate for ESR testing, as it does not provide the optimal conditions for red blood cell sedimentation measurement. [Practice more Pathology PYQs on OnCourse]

14 Previous Year Questions with Answers & Explanations

Questions

A 70-year-old man presents with painless cervical lymphadenopathy with progressive pallor and petechiae on ankles. Peripheral smear shows presence of:

The following bone marrow specimen is suggestive of diagnosis of:

Identify the cell.

Name the test given.

Name the anticoagulant used in the following method.

The resected specimen of a kidney is seen below. What is the diagnosis?

Comment on type of glomerulonephritis present in the kidney biopsy slide. (Recent NEET Pattern 2016-17)

All are causes of this glomerular presentation except: (Recent NEET Pattern 2016-17)

All are true about the presentation in kidney biopsy shown except: (Recent NEET Pattern 2016-17)

Q10

Comment on the diagnosis of light microscopy finding in kidney biopsy. (Recent NEET Pattern 2016-17)

NEET-PG 2017 - Pathology NEET-PG Practice Questions and MCQs

Question 1: A 70-year-old man presents with painless cervical lymphadenopathy with progressive pallor and petechiae on ankles. Peripheral smear shows presence of:

A. Acute ITP
B. Chronic ITP
C. CLL (Correct Answer)
D. Richter syndrome
E. Hairy cell leukemia

Explanation: ***CLL*** - The presentation of **painless cervical lymphadenopathy**, progressive **pallor** (due to anemia), and **petechiae** (due to thrombocytopenia) in an elderly patient is highly suggestive of **Chronic Lymphocytic Leukemia (CLL)** [2]. - Peripheral smear in CLL typically shows a proliferation of mature-appearing **small lymphocytes** and characteristic **smudge cells** [1]. *Acute ITP* - Acute ITP is characterized by sudden onset of **thrombocytopenia** and bleeding, often following a viral infection, and is more common in children. - It does not typically present with **lymphadenopathy** or progressive pallor as a primary feature. *Chronic ITP* - Chronic ITP is characterized by isolated **thrombocytopenia** and bleeding symptoms, usually without lymphadenopathy or significant anemia unless bleeding is severe. - The presence of **lymphadenopathy** points away from isolated ITP and towards a systemic hematological malignancy. *Richter syndrome* - Richter syndrome is the transformation of CLL into a more aggressive lymphoma, most commonly **diffuse large B-cell lymphoma (DLBCL)**. - While it can present with rapidly enlarging lymph nodes and systemic symptoms, the initial presentation described (painless lymphadenopathy, progressive pallor, petechiae) is more typical of **untreated CLL** before transformation [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. 602. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 612-613.

Question 2: The following bone marrow specimen is suggestive of diagnosis of:

A. Pure red cell aplasia
B. Myelodysplasia
C. Normal marrow
D. Aplastic anemia (Correct Answer)
E. Hairy cell leukemia

Explanation: ***Aplastic anemia*** - Aplastic anemia is characterized by a **hypocellular bone marrow** with a significant reduction in hematopoietic cells and replacement by **fat cells (adipocytes)** as seen in the specimen. - This condition leads to **pancytopenia**, affecting all three cell lines (red blood cells, white blood cells, and platelets). - Bone marrow cellularity is typically **<25%** (normal ~50%), with the remaining space occupied by fat and stroma. *Pure red cell aplasia* - Pure red cell aplasia primarily affects **erythroid precursors** in the bone marrow, leading to severe anemia. - Unlike aplastic anemia, the **myeloid and megakaryocytic lineages** are typically preserved, and overall marrow cellularity is not severely reduced. *Myelodysplasia* - Myelodysplastic syndromes (MDS) are characterized by **dysplastic changes** in one or more hematopoietic cell lines and **ineffective hematopoiesis**. - The bone marrow in MDS can be **normocellular or hypercellular** with morphological dysplasia (abnormal cell forms), not simply hypocellular with fat replacement. *Normal marrow* - A normal bone marrow is **cellular for the patient's age**, with a healthy mix of hematopoietic cells from all lineages and appropriate fat content (~50% cellularity in adults). - It would not show the profound **hypocellularity and fat replacement** seen in the provided specimen. *Hairy cell leukemia* - Hairy cell leukemia (HCL) shows bone marrow infiltration by **lymphoid cells with characteristic cytoplasmic hair-like projections** (best seen on peripheral smear). - Bone marrow biopsy in HCL typically shows **"fried egg" appearance** due to widely spaced hairy cells with pale cytoplasm — not a simple hypocellular, fat-replaced marrow. - HCL causes **dry tap** on aspiration but the trephine shows infiltration, not the pure hypocellularity seen in aplastic anemia. **References:** [1] Kumar V, Abbas AK, et al. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, p. 662. [2] Kumar V, Abbas AK, et al. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 662-663. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 595-596. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 613-614.

Question 3: Identify the cell.

A. Eosinophil
B. Basophil
C. Monocyte (Correct Answer)
D. Lymphocyte
E. Neutrophil

Explanation: ***Monocyte*** - Monocytes are characterized by their **large size** (12-20 µm), **kidney-shaped or horseshoe-shaped nucleus**, and **abundant, often grayish-blue cytoplasm** with fine azurophilic granules [1]. - They are precursors to **macrophages** and play a crucial role in phagocytosis and antigen presentation [1]. *Eosinophil* - Eosinophils have a **bilobed nucleus** and prominent **red-orange granules** in their cytoplasm, which stain with eosin [1]. - They are primarily involved in allergic reactions and defense against **parasitic infections** [1]. *Basophil* - Basophils are characterized by a **lobed nucleus** often obscured by large, coarse, **dark purple-blue granules** that contain histamine and heparin [1]. - They are the least common granulocyte and are involved in **allergic and inflammatory responses** [1]. *Lymphocyte* - Lymphocytes are typically **smaller** than monocytes, with a **large, round, or slightly indented nucleus** that occupies most of the cell [1]. - Their cytoplasm is usually **scanty and pale blue**, often appearing as a thin rim around the nucleus [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 578-580.

Question 4: Name the test given.

A. Osmotic fragility
B. NESTROFT
C. Sickling test
D. ESR measurement (Correct Answer)
E. Packed cell volume (PCV)

Explanation: ***ESR measurement*** - The image displays a **Westergren tube** with a column of blood, showing distinct layers of plasma on top and red blood cells settled below against a calibrated scale. - This setup is characteristic of an **Erythrocyte Sedimentation Rate (ESR)** test, which measures the rate at which red blood cells fall in a standardized tube over a specific time, indicating inflammation. *Osmotic fragility* - This test involves exposing red blood cells to varying concentrations of **hypotonic saline solutions** to assess their resistance to lysis. - The results are typically reported as a curve showing the percentage of hemolysis at different saline concentrations, not a simple sedimentation in a tube. *NESTROFT* - The **Naked Eye Single Tube Red Cell Osmotic Fragility Test (NESTROFT)** is a quick screening test for **beta-thalassemia trait**. - It involves mixing blood with a hypotonic saline solution and observing for complete hemolysis or partial hemolysis with a button of red cells, which is different from the image shown. *Sickling test* - A sickling test is used to detect the presence of **sickle hemoglobin**, which causes red blood cells to deform into a sickle shape under low oxygen conditions. - This test is usually performed by adding a reducing agent like **sodium metabisulfite** to a blood sample and observing cell morphology under a microscope or by turbidity, not by sedimentation in a calibrated tube. *Packed cell volume (PCV)* - PCV or **hematocrit** measures the proportion of blood volume occupied by red blood cells after centrifugation in a **microhematocrit tube**. - While it does involve blood in a tube, the tube is much smaller (capillary tube) and requires **centrifugation** to separate components, unlike ESR which relies on natural sedimentation under gravity in a larger calibrated Westergren tube.

Question 5: Name the anticoagulant used in the following method.

A. EDTA
B. Heparin
C. Trisodium citrate (Correct Answer)
D. Dalteparin
E. Sodium fluoride

Explanation: ***Trisodium citrate*** - The image displays a method for measuring **Erythrocyte Sedimentation Rate (ESR)**, typically performed using the **Westergren method**. - In the Westergren method, **trisodium citrate** is the standard anticoagulant used to prevent blood coagulation, allowing red blood cells to settle over time. *EDTA* - **EDTA (ethylenediaminetetraacetic acid)** is a common anticoagulant, primarily used for **hematology tests** such as complete blood counts (CBC), as it preserves cell morphology. - While it prevents clotting, it is not the standard anticoagulant for the Westergren ESR method, as it can cause red blood cell shrinkage affecting sedimentation. *Heparin* - **Heparin** acts as an anticoagulant by enhancing the activity of **antithrombin III**, and is commonly used for chemistry and general coagulation studies. - It interferes with the sedimentation rate in ESR measurements, making it unsuitable for this specific test. *Dalteparin* - **Dalteparin** is a type of **low molecular weight heparin (LMWH)** used therapeutically as an anticoagulant to prevent and treat blood clots. - It is not used as an in-vitro anticoagulant for blood collection tubes or lab diagnostic tests like ESR. *Sodium fluoride* - **Sodium fluoride** is an anticoagulant and enzymatic inhibitor primarily used for **glucose measurement**, as it inhibits glycolysis and preserves glucose levels. - It is not appropriate for ESR testing, as it does not provide the optimal conditions for red blood cell sedimentation measurement.

Question 6: The resected specimen of a kidney is seen below. What is the diagnosis?

A. Amyloidosis
B. Acute poststreptococcal glomerulonephritis
C. Flea bitten kidney of malignant hypertension (Correct Answer)
D. Chronic glomerulonephritis
E. Acute tubular necrosis

Explanation: ***Flea bitten kidney of malignant hypertension*** - The term "flea-bitten kidney" describes the gross appearance of the kidney in **malignant hypertension**, characterized by numerous pinpoint hemorrhages on the cortical surface [1]. - These hemorrhages result from the rupture of **arterioles and capillaries** due to severe, uncontrolled high blood pressure [1]. *Amyloidosis* - In **amyloidosis**, the kidneys typically appear enlarged, pale, and waxy due to the deposition of **amyloid protein**. - It does not typically present with the characteristic pinpoint hemorrhages seen in a "flea-bitten" appearance. *Acute poststreptococcal glomerulonephritis* - In **acute poststreptococcal glomerulonephritis (APSGN)**, the kidneys are usually enlarged and pale, often with a smooth surface. - While there can be some congestion, the classic "flea-bitten" appearance with widespread petechial hemorrhages is not a typical gross finding. *Chronic glomerulonephritis* - **Chronic glomerulonephritis** typically leads to shrunken, granular, and scarred kidneys due to long-standing inflammation and fibrosis. - The gross appearance is usually one of atrophy and scarring, not the acute hemorrhagic spots described as "flea-bitten." **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 945.

Question 7: Comment on type of glomerulonephritis present in the kidney biopsy slide. (Recent NEET Pattern 2016-17)

A. Acute glomerulonephritis
B. Crescentic glomerulonephritis (Correct Answer)
C. Focal segmental glomerulosclerosis
D. Diffuse glomerulosclerosis
E. Membranous glomerulonephritis

Explanation: ***Crescentic glomerulonephritis*** - The presence of **crescents** in the glomeruli is the hallmark of **crescentic glomerulonephritis**, indicating severe glomerular injury [1]. - Crescents are formed by the proliferation of **parietal epithelial cells** and infiltration of macrophages, leading to rapid decline in renal function [1]. *Acute glomerulonephritis* - This is a broad term that can encompass various forms of glomerulonephritis, but it does not specifically describe the **morphological finding of crescents**. - Acute glomerulonephritis often presents with **nephritic syndrome** (hematuria, proteinuria, hypertension), but the biopsy finding of crescents is more specific [1]. *Focal segmental glomerulosclerosis* - Characterized by **sclerosis** (scarring) affecting **some glomeruli** (focal) and **only parts of the glomerular tuft** (segmental). - It typically presents with **nephrotic syndrome** (heavy proteinuria, edema, hypoalbuminemia), which is distinct from the rapid renal failure seen with crescents. *Diffuse glomerulosclerosis* - This term implies widespread **sclerosis** affecting **all glomeruli**, often seen in advanced chronic kidney disease. - It does not specifically describe the **active inflammatory process** and crescent formation characteristic of crescentic glomerulonephritis [2]. **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. 528-529. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 536-537.

Question 8: All are causes of this glomerular presentation except: (Recent NEET Pattern 2016-17)

A. HIV
B. Reflux nephropathy (Correct Answer)
C. Hepatitis B
D. Heroin abuse
E. Obesity

Explanation: ***Reflux nephropathy*** - This condition primarily causes **tubulointerstitial damage** and **scarring**, leading to chronic kidney disease, but it is not a direct cause of a primary glomerular presentation like **focal segmental glomerulosclerosis (FSGS)**. - While it can lead to proteinuria, it's usually due to secondary glomerular changes from chronic damage rather than a primary glomerular disease. *HIV* - **HIV-associated nephropathy (HIVAN)** is a common cause of **collapsing FSGS**, a specific glomerular presentation [1] [2]. - It is characterized by rapid progression to end-stage renal disease and often presents with heavy proteinuria [1]. *Hepatitis B* - Hepatitis B infection is strongly associated with **membranous nephropathy** and, less commonly, with **membranoproliferative glomerulonephritis (MPGN)**, both of which are distinct glomerular presentations [1]. - These conditions involve immune complex deposition in the glomeruli. *Heroin abuse* - Heroin abuse is a well-known cause of **focal segmental glomerulosclerosis (FSGS)**, often presenting as **heroin-associated nephropathy** [3] [4]. - This condition typically leads to significant proteinuria and progressive renal failure [3] [4]. **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. 531-532. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 924-925. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 530-531.

Question 9: All are true about the presentation in kidney biopsy shown except: (Recent NEET Pattern 2016-17)

A. Loss of foot processes
B. IgG and properdin deposits (Correct Answer)
C. Hyalinosis
D. Seen with HIV associated nephropathy
E. Presents with nephrotic syndrome

Explanation: ***IgG and properdin deposits*** - The question asks for what is *not* true about the presentation in a kidney biopsy. **IgG and properdin deposits** are characteristic of **dense deposit disease (DDD)** or C3 glomerulopathy, not typically seen in the context of **focal segmental glomerulosclerosis (FSGS)**, which is often implied by the other options. - FSGS is primarily a podocyte disorder, and while immune deposits can occur, IgG and properdin are not its defining immunofluorescence features. In FSGS, immunofluorescence is negative other than non-specific trapping of IgM and C3 in the segmental lesions [1]. The diagnosis requires absence of immune deposits on IF [4]. *Loss of foot processes* - **Loss of foot processes** (podocyte effacement) is a hallmark ultrastructural finding in conditions causing **proteinuria**, including **focal segmental glomerulosclerosis (FSGS)** and minimal change disease [1][3]. - This morphological change is directly responsible for increased glomerular permeability to proteins. Podocyte injury is an underlying mechanism of proteinuria in FSGS [3]. *Hyalinosis* - **Hyalinosis** refers to the accumulation of homogeneous, eosinophilic material, often plasma proteins, within the glomerulus. - It is a characteristic feature of **focal segmental glomerulosclerosis (FSGS)**, particularly in the sclerotic segments, with segmental obliteration of glomerular capillary tufts by sclerosis frequently accompanied by hyalinosis [1]. *Seen with HIV associated nephropathy* - **HIV-associated nephropathy (HIVAN)** is a specific form of **collapsing focal segmental glomerulosclerosis (FSGS)** [1][2]. - It is characterized by prominent tubular microcysts and severe interstitial inflammation and fibrosis, in addition to the collapsing glomerular lesions. FSGS may be secondary to infection such as HIV [3], and the collapsing variant has an unfavorable course [2]. **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. 531-532. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 924-925. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 530-531.

Question 10: Comment on the diagnosis of light microscopy finding in kidney biopsy. (Recent NEET Pattern 2016-17)

A. Focal segmental glomerulosclerosis
B. Diffuse glomerulosclerosis
C. Nodular glomerulosclerosis (Correct Answer)
D. Minimal change disease
E. Membranoproliferative glomerulonephritis

Explanation: ***Nodular glomerulosclerosis*** - This finding is characteristic of **diabetic nephropathy**, specifically the **Kimmelstiel-Wilson lesions** [1]. - It involves the formation of **nodular deposits** in the mesangium, leading to glomerulosclerosis. *Focal segmental glomerulosclerosis* - Characterized by **sclerosis** affecting only **some glomeruli** (focal) and only **parts of the glomerular tuft** (segmental). - It is a common cause of **nephrotic syndrome** and is often associated with HIV, heroin abuse, or genetic mutations. *Diffuse glomerulosclerosis* - Implies widespread sclerosis affecting **most or all glomeruli diffusely**. - This is a general term and can be seen in various end-stage renal diseases, not specific to a single primary diagnosis like nodular glomerulosclerosis. *Minimal change disease* - On light microscopy, the glomeruli appear **normal**, hence the term "minimal change" [2]. - The characteristic finding is **effacement of foot processes** on electron microscopy [2], and it is a common cause of nephrotic syndrome in children. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1121. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 922-923.