Renal Pathology Practice Questions

Q: Subepithelial deposits in the kidney are primarily associated with which condition?

Post-Streptococcal Glomerulonephritis (PSGN). ***PSGN*** - Post-streptococcal glomerulonephritis (PSGN) is characterized by **subepithelial immune complex deposits** [1], typically after a streptococcal infection [1]. - It is associated with **hematuria**, **edema**, and elevated **anti-streptolysin O (ASO)** titers. *GPS* - Minimal change disease (often referred to as idiopathic nephrotic syndrome) does not primarily feature **subepithelial deposits** but rather **effacement of podocyte foot processes**. - Clinical presentation includes **nephrotic syndrome** symptoms, not glomerulonephritis like PSGN. *MPGN-1* - Membranoproliferative glomerulonephritis type 1 includes **subendothelial deposits** rather than subepithelial deposits associated with PSGN. - Symptoms often include **nephritic syndrome** and is commonly linked with conditions like **HCV infection**. *All* - While several conditions can show **deposits in kidney**, not all are characterized by **subepithelial deposits**, hence this option is inaccurate. - Each type of glomerular disease has specific types of deposits (immune complex vs. complement) associated with their pathophysiology. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 914-916.

Q: Renal stones which are laminated and irregular in outline are

Calcium oxalate. ***Calcium oxalate*** - **Calcium oxalate stones** are the most common type of kidney stones and characteristically present with a **laminated** (layered) and **irregular, spiculated outline** due to their crystalline structure - They are typically **radio-opaque** on X-rays due to their calcium content - The irregular outline distinguishes them from other stone types *Uric acid* - **Uric acid stones** are often **smooth**, hard, and **yellowish-brown** in appearance - They are **radio-lucent** on standard X-rays and are associated with conditions like gout or acidic urine - Their smooth surface contrasts with the irregular calcium oxalate stones *Struvite* - **Struvite stones** (magnesium ammonium phosphate) are strongly associated with **urinary tract infections** (UTIs) and can form **staghorn calculi**, filling the renal pelvis - They tend to be **friable** and have a **smooth or glistening** surface, often growing quite large - Associated with urease-producing bacteria *Cystine* - **Cystine stones** are caused by a genetic disorder affecting amino acid transport and generally appear **smooth, waxy, and hexagonal crystal-shaped** - They are typically **moderately radio-opaque** but less dense than calcium stones - The smooth, waxy appearance differs from the irregular calcium oxalate stones

Q: According to WHO/ISN classification, which class of lupus nephritis shows a membranous pattern in SLE?

Membranous pattern. ***Membranous pattern*** - This corresponds to **Class V lupus nephritis** in the WHO/ISN classification, characterized by widespread immune complex deposition along the **glomerular basement membrane (GBM)**. - The subepithelial immune deposits lead to GBM thickening, creating the characteristic membranous pattern on light microscopy. - This pattern resembles idiopathic membranous nephropathy but occurs in the context of SLE. *Mesangial pattern involvement* - This refers to **Class I (minimal mesangial LN)** or **Class II (mesangial proliferative LN)**, where immune deposits are primarily confined to the mesangium. - There is minimal or no involvement of the glomerular capillary walls, distinguishing it from the membranous pattern. *Diffuse proliferative pattern* - This is **Class IV lupus nephritis**, the most severe form characterized by widespread **endocapillary and/or extracapillary proliferation** involving ≥50% of glomeruli. - The primary feature is cellular proliferation (mesangial, endocapillary, epithelial crescents), not the subepithelial immune deposits typical of membranous pattern. *Focal proliferative pattern* - This corresponds to **Class III lupus nephritis**, involving **endocapillary or extracapillary proliferation** in <50% of glomeruli. - Distinguished by focal (not diffuse) involvement and active proliferation rather than the membranous pattern seen in Class V.

Q: What is the primary mechanism involved in the pathogenesis of acute proliferative glomerulonephritis?

Immune complex mediated. ***Immune complex mediated*** - The pathogenesis of **acute proliferative glomerulonephritis** is primarily caused by **immune complexes** that deposit in the glomeruli, leading to inflammation [1]. - This is typically associated with **post-streptococcal infections**, where the body's immune response generates complexes that affect kidney function [1]. *Cytotoxic T-cell mediated* - This mechanism involves T-cells directly damaging cells, which is not the primary cause of **acute proliferative glomerulonephritis**. - It is more relevant in conditions like **viral infections** or **transplant rejection**, rather than immune complex diseases. *Antibody mediated* - While antibodies play a role in various diseases, acute proliferative glomerulonephritis is primarily mediated by **immune complexes**, not just antibodies alone [1]. - This oes not account for the presence of **complexes formed from antigens**, which is crucial in the pathogenesis [1]. *Cell-mediated (Type IV)* - Type IV hypersensitivity involves delayed-type hypersensitivity, typically seen in **tuberculosis** or **contact dermatitis**, not in acute glomerulonephritis. - The inflammation in this case is due to **immune complexes**, rather than a purely cell-mediated response [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 910-916.

Q: Which of the following statements is true regarding light microscopy findings in minimal change disease?

No significant changes are seen under light microscopy.. ***No change seen*** - In minimal change disease, **light microscopy** typically shows no significant changes, which is a key characteristic of the condition [1]. - The disease primarily affects the **podocytes** leading to **nephrotic syndrome**, while light microscopy does not reveal any abnormalities [1]. *Loss of foot process seen* - Loss of foot processes is actually observed under **electron microscopy**, not light microscopy. - Light microscopy remains normal, differentiating minimal change disease from other glomerular diseases. *IgA deposits seen* - IgA deposits are associated with **IgA nephropathy**, which is a different condition characterized by mesangial deposition. - Minimal change disease does not have **immunofluorescence** findings, and thus shows no such deposits on light microscopy [1]. *Anti GBM Abs seen* - Anti-GBM antibodies are characteristic of **Goodpasture syndrome**, which presents with significant changes in glomerular structure. - In minimal change disease, there are no **anti-GBM antibodies** or major changes visible under light microscopy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928.

Q: In glomerulus subendothelial deposits are seen in?

MPGN type I (subendothelial deposits). ***MPGN type I*** - **Subendothelial deposits** are a hallmark of MPGN type I, often associated with **immune complex deposition** [1]. - This condition can present with **hematuria**, **proteinuria**, and can be triggered by infections or autoimmune diseases [1]. *Good pasture syndrome* - Primarily involves **anti-GBM antibodies** leading to **glomerulonephritis** and pulmonary hemorrhage, not subendothelial deposits. - Typically, it presents with **crescent formation** in the glomeruli rather than deposits. *MPGN type II* - Characterized by **dense deposit disease**, it features **intramembranous** rather than subendothelial deposits [1]. - It is often associated with **C3 nephritic factor** and does not show classic subendothelial pathology. *IgA nephropathy* - Characterized by **IgA deposits** primarily in the **mesangium**, not subendothelially. - It presents with **hematuria** and recurrent episodes of **macrohematuria**, especially after infections. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 925-927.

Q: What is the most common cause of nephritic syndrome in adults, excluding IgA nephropathy?

Membranoproliferative glomerulonephritis. ***None*** - Nephritic syndrome in adults is often caused by various conditions, but there is **no single most common cause** that universally applies. - The true prevalence can vary by population, but conditions like **IgA nephropathy** or **post-infectious glomerulonephritis** [1] are frequently encountered rather than one specific disease. *Membranoproliferative glomerulonephritis* - This condition can cause a **nephritic syndrome** [1], but it is not the most common cause in adults, often seen in association with **hepatitis C** or other infections. - In practice, **IgA nephropathy** or **post-streptococcal glomerulonephritis** [1] are more frequently recognized causes of nephritic syndrome in adults. *Membranous glomerulonephritis* - Primarily presents with **nephrotic syndrome** rather than nephritic features [1], making it less likely to be cited as a common cause of nephritic syndrome. - It is associated with **anti-phospholipase A2 receptor antibodies** but lacks the inflammatory features of nephritis [1]. *FSGN* - **Focal Segmental Glomerulosclerosis** is associated with nephrotic syndrome and doesn't typically lead to classic nephritic features, such as hematuria and hypertension [1]. - Its primary presentation is with **proteinuria** and possible renal failure but not with the typical characteristics of nephritic syndrome [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 915-919.

Q: Oncocytic carcinoma arises from -

Collecting duct (intercalated cells). ***Collecting duct*** - Oncocytic carcinoma primarily originates from the **collecting ducts** of the kidney, where oncocytes are characteristically found [1]. - It is associated with specific **morphological features**, including abundant eosinophilic cytoplasm. *Loop of henle* - This part of the nephron primarily functions in **concentration of urine** and is not a common site for oncocytic tumors. - Tumors arising here typically do not exhibit **oncocytic features** and are more often linked to different renal cell types. *Glomerulus* - The glomerulus is involved in **filtration of blood** and lacks oncocytic differentiation. - Oncocytic carcinoma does not arise from glomerular structures, as it features distinct cellular characteristics. *Perivascular* - This term refers to the tissue surrounding blood vessels and is not a site for oncocytic carcinoma development. - Such tumors would not align with the histological features or origins typically seen in oncocytic carcinoma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 959.

Q: Which of the following is the MOST COMMON cause of acute hypocomplementemia in children following an infection?

PSGN. ***PSGN*** - **Post-streptococcal glomerulonephritis (PSGN)** is the **most common cause of acute hypocomplementemia** in children following a streptococcal infection [1]. - Characterized by **immune complex deposition** in the glomeruli with activation of the complement system [2]. - Results in **transient hypocomplementemia** (both C3 and C4 decreased) that typically normalizes within 6-8 weeks. - Classic presentation: acute nephritic syndrome 1-3 weeks after pharyngitis or 3-6 weeks after skin infection [1]. *Membranous GN* - **Membranous glomerulonephritis** presents with **nephrotic syndrome** and immune complex deposition [2]. - Associated with **normal complement levels** in most cases. - Complement activation is not severe enough to cause significant consumption. *Focal Segmental Glomerulosclerosis (FSGS)* - **FSGS** causes nephrotic syndrome with **scarring of selected glomeruli** [3]. - **Not an immune complex-mediated disease**, hence no complement consumption [3]. - Complement levels remain **normal**. *Membranoproliferative GN (MPGN)* - **MPGN** can also cause hypocomplementemia, particularly Type II (dense deposit disease) with persistent C3 consumption due to C3 nephritic factor. - However, **MPGN is much less common** than PSGN in the pediatric population. - Type I MPGN may show low C3 with normal or low C4. - PSGN remains the **classic and most frequent** acute post-infectious cause [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 914-915. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 915. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 927-928.

Q: Mitochondrial abnormalities are associated with which of the following conditions?

Leigh syndrome. ***Fanconi syndrome*** - Fanconi syndrome is associated with **renal tubular dysfunction**, leading to **metabolic acidosis** and hypophosphatemia, often showing mitochondrial abnormalities [1]. - It can be linked to certain **toxins and genetic disorders**, affecting mitochondrial function, particularly in the context of renal cells. *Fanconi syndrome* - This option is a repeat and should not be considered separately; the proper acknowledgment of Fanconi syndrome is included in the correct answer. - The condition itself is not missed but stated correctly under the correct answer. *Krabbe's disease* - Krabbe's disease primarily involves **galactocerebrosidase deficiency** and affects the central nervous system, not primarily linked to mitochondrial dysfunction [2]. - It presents with **neuropathy**, **global developmental delay**, and **progressive weakness**, which are distinct from mitochondrial disorders. *Fabry disease* - Fabry disease is caused by **alpha-galactosidase A deficiency**, leading to lysosomal accumulation, primarily affecting **vascular and renal systems**. - Mitochondrial dysfunction is not a primary feature, making it distinguishable from mitochondrial abnormalities. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, pp. 1246-1247. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1304-1305.

Question 1

Subepithelial deposits in the kidney are primarily associated with which condition?

Accepted Answer

Post-Streptococcal Glomerulonephritis (PSGN)

Answer

None of these conditions are associated with subepithelial deposits.

Answer

Membranoproliferative Glomerulonephritis (MPGN) Type I

Answer

Goodpasture's Syndrome (GPS)

Question 2

Renal stones which are laminated and irregular in outline are

Accepted Answer

Calcium oxalate

Answer

Uric acid

Answer

Struvite

Answer

Cystine

Question 3

According to WHO/ISN classification, which class of lupus nephritis shows a membranous pattern in SLE?

Accepted Answer

Membranous pattern

Answer

Diffuse proliferative pattern

Answer

Mesangial pattern involvement

Answer

Focal proliferative pattern

Question 4

What is the primary mechanism involved in the pathogenesis of acute proliferative glomerulonephritis?

Accepted Answer

Immune complex mediated

Answer

T-cell mediated cytotoxicity

Answer

Direct antibody-mediated injury

Answer

Type IV hypersensitivity reaction

Question 5

Which of the following statements is true regarding light microscopy findings in minimal change disease?

Accepted Answer

No significant changes are seen under light microscopy.

Answer

Foot process effacement is observed under electron microscopy, not light microscopy.

Answer

Anti-GBM antibodies are associated with Goodpasture syndrome, not minimal change disease.

Answer

IgA deposits are characteristic of IgA nephropathy, not minimal change disease.

Question 6

In glomerulus subendothelial deposits are seen in?

Accepted Answer

MPGN type I (subendothelial deposits)

Answer

Goodpasture syndrome (linear IgG deposits in the basement membrane)

Answer

MPGN type II (intramembranous deposits)

Answer

IgA nephropathy (mesangial IgA deposits)

Question 7

What is the most common cause of nephritic syndrome in adults, excluding IgA nephropathy?

Accepted Answer

Membranoproliferative glomerulonephritis

Answer

FSGS

Answer

Membranous glomerulonephritis

Answer

Post-infectious glomerulonephritis

Question 8

Oncocytic carcinoma arises from -

Accepted Answer

Collecting duct (intercalated cells)

Answer

Perivascular region

Answer

Renal glomerulus

Answer

Loop of Henle

Question 9

Which of the following is the MOST COMMON cause of acute hypocomplementemia in children following an infection?

Accepted Answer

PSGN

Answer

Membranous GN

Answer

Focal Segmental Glomerulosclerosis (FSGS)

Answer

Membranoproliferative GN (MPGN)

Question 10

Mitochondrial abnormalities are associated with which of the following conditions?

Accepted Answer

Leigh syndrome

Answer

Krabbe's disease

Answer

Fabry disease

Answer

Fanconi syndrome

Renal Pathology — MCQs

Renal Pathology — MCQs

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