Renal Pathology Practice Questions

Q: Most common type of renal carcinoma is:

Clear cell type. ***Clear cell type*** - The **clear cell type** is the most common subtype of renal carcinoma, constituting about **70-80%** of cases [3]. - It is typically associated with **von Hippel-Lindau syndrome** and presents with clear or "foamy" cells due to lipid accumulation [3]. *Chromophobe type* - This type comprises about **5-10%** of renal cell carcinomas and usually has a better prognosis [1]. - Characterized by **pale cells with distinct cell borders** and lacks the common features of clear cell carcinoma [1]. *Tubular type* - The tubular variant is less common and does not represent a major subtype of renal cell carcinoma. - It is often confused with other variants but lacks the distinct characteristics of the clear cell type. *Papillary type* - The papillary type accounts for about **10-15%** of renal carcinomas and is characterized by papillary structures [2]. - This type generally has a distinct chromosomal mutation profile compared to the clear cell type [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 959. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 958-959. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 959-961.

Q: IgA nephropathy is not associated with which of the following?

Decreased complement level. ***Decreased complement level*** - IgA nephropathy is typically associated with **normal serum complement levels** (C3 and C4), which is an important distinguishing feature. - Unlike post-streptococcal glomerulonephritis or lupus nephritis where complement levels are **low/decreased**, IgA nephropathy does not cause systemic complement consumption. - While complement activation does occur locally in the glomerulus (via lectin and alternative pathways), it does not lead to a decrease in serum complement levels. *Focal mesangial proliferation* - This is a **common histological finding** in IgA nephropathy, reflecting the proliferative response to IgA deposition in the mesangium. - The mesangial cells proliferate in an attempt to clear the immune deposits. *Gross hematuria concurrent with upper respiratory infection* - This is a **classic clinical presentation** of IgA nephropathy, often referred to as **synpharyngitic hematuria**. - The episode of gross hematuria typically occurs **within 1-2 days** of the onset of an upper respiratory tract infection, distinguishing it from post-streptococcal glomerulonephritis where hematuria appears 1-3 weeks later. *Immunofluorescence deposits contain IgA and IgG* - The defining feature of IgA nephropathy on immunofluorescence is the **predominant deposition of IgA**, often accompanied by C3. - While IgA is the primary immunoglobulin, **IgG and IgM can also be present** in variable amounts, but IgA must be the dominant or co-dominant immunoglobulin for the diagnosis.

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: 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: 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: 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 the 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: In which condition are Michaelis Gutmann bodies typically seen?

Malakoplakia. ***Malakoplakia*** - **Michaelis-Gutmann bodies** are pathognomonic histological features of malakoplakia, representing calcified concretions containing **iron and calcium** within macrophages. - These are formed around **partially digested bacteria** within defective macrophages, appearing as basophilic inclusions with a "target-like" or "owl's eye" appearance. - Malakoplakia is a chronic granulomatous inflammatory condition most commonly affecting the **urinary tract** (bladder, kidney), but can occur in other organs. *Xanthogranulomatous* - This condition is characterized by an infiltrate of **lipid-laden macrophages** (xanthoma cells, foam cells) and occasional giant cells, but **not** Michaelis-Gutmann bodies. - It most commonly affects the kidney (**xanthogranulomatous pyelonephritis**) and is a destructive inflammatory process with a mass-like appearance. *Pyelonephritis* - Refers to **inflammation of the kidney and renal pelvis**, usually due to bacterial infection (commonly E. coli). - Histologically, it is characterized by acute or chronic inflammatory cells, neutrophil infiltration, and potential abscess formation, **without** Michaelis-Gutmann bodies. *Nail patella syndrome* - This is a **genetic disorder** (autosomal dominant) affecting primarily the **nails, bones** (absent/hypoplastic patella, elbow dysplasia), and sometimes the kidneys (glomerular disease). - It is associated with developmental abnormalities and has **no association** with Michaelis-Gutmann bodies or malakoplakia.

Q: Which of the following is a renal-specific nephropathy associated with HIV?

Focal Segmental Glomerulosclerosis (FSGS). ### Focal Segmental Glomerulosclerosis - It is a common renal complication associated with **HIV infection**, characterized by **podocyte injury** and segmental sclerosis [1]. - Often results in **nephrotic syndrome**, presenting with significant **proteinuria** and edema, making it distinct in HIV renal pathology [1]. ### Membranous Glomerulonephritis - Typically presents with **subepithelial immune complex deposits**, leading to a different pathophysiological mechanism. - More commonly associated with other secondary causes, such as **drugs** or **infection**, rather than being specific to HIV. ### Mesangioproliferative Glomerulonephritis - Characterized by **mesangial cell proliferation and immune complex deposition**, often linked with various infections but not specifically with HIV. - Usually shows **hematuria** and mild proteinuria, lacking the severe nephrotic syndrome seen in focal segmental glomerulosclerosis. ### Membranoproliferative Glomerulonephritis - Features **proliferation of mesangial and endothelial cells**, leading to a distinctive pattern on renal biopsy, not specific to HIV. - Typically presents in other contexts such as **chronic infections** or **autoimmune diseases**, rather than predominantly with HIV.

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.

Question 1

Most common type of renal carcinoma is:

Accepted Answer

Clear cell type

Answer

Chromophobe type

Answer

Papillary type

Answer

Collecting duct type

Question 2

IgA nephropathy is not associated with which of the following?

Accepted Answer

Decreased complement level

Answer

Focal mesangial proliferation

Answer

Gross hematuria concurrent with upper respiratory infection

Answer

Immunofluorescence deposits contain IgA and IgG

Question 3

Renal stones which are laminated and irregular in outline are

Accepted Answer

Calcium oxalate

Answer

Uric acid

Answer

Struvite

Answer

Cystine

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

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 6

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 7

In the 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 8

In which condition are Michaelis Gutmann bodies typically seen?

Accepted Answer

Malakoplakia

Answer

Xanthogranulomatous

Answer

Pyelonephritis

Answer

Nail patella syndrome

Question 9

Which of the following is a renal-specific nephropathy associated with HIV?

Accepted Answer

Focal Segmental Glomerulosclerosis (FSGS)

Answer

Mesangioproliferative Glomerulonephritis

Answer

Membranous Nephropathy

Answer

Membranoproliferative Glomerulonephritis (MPGN)

Question 10

Oncocytic carcinoma arises from -

Accepted Answer

Collecting duct (intercalated cells)

Answer

Perivascular region

Answer

Renal glomerulus

Answer

Loop of Henle

Renal Pathology — MCQs

Renal Pathology — MCQs

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