Renal Pathology Practice Questions

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: What is the most important prognostic factor of Wilms tumour?

Histopathology. ***Histopathology*** - The presence of **anaplastic histology**, particularly diffuse anaplasia, is the most significant adverse prognostic factor in Wilms tumor. - Tumors with favorable histology (triphasic, blastemal, stromal, or epithelial predominant) have an excellent prognosis, while those with anaplastic features have significantly worse outcomes [1]. *Ploidy of cells* - While **aneuploidy** (specifically, **hyperdiploidy**) has been associated with improved prognosis in some childhood cancers, its role as an independent prognostic factor in Wilms tumor is less significant than histology [2]. - It is not the most important factor in determining the overall outcome. *Age < 1 yr* - **Younger age** (typically less than 1 year) at diagnosis is generally associated with a **more favorable prognosis** in Wilms tumor. - This is because these tumors are often smaller, less aggressive, and more likely to have favorable histology. *Mutation of WT1 gene* - **WT1 gene mutations** are implicated in the development of Wilms tumor, particularly in syndromes like WAGR (Wilms tumor, aniridia, genitourinary anomalies, intellectual disability). - While critical for pathogenesis, the mere presence of a WT1 mutation is **not the primary determinant** of prognosis compared to tumor histology. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 488-490. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 486-487.

Q: What is the most significant risk factor for transitional cell carcinoma of the bladder?

Schistosomiasis. ***Schistosomiasis*** - Schistosomiasis, especially caused by *Schistosoma haematobium*, is strongly associated with the development of **transitional cell carcinoma** of the bladder. - The inflammation and chronic irritation of the bladder epithelium by the parasite lead to increased risk of **malignant transformation**. *None* - This option implies that there are **no known causes**, which is incorrect, as there are well-established associations, particularly with schistosomiasis. - Transitional cell carcinoma of the bladder has **known risk factors** and associations, contrary to this option's suggestion. *Ascariasis* - Ascariasis is primarily an **intestinal infection** caused by *Ascaris lumbricoides* and is not linked to bladder cancer. - It is more associated with **pulmonary symptoms** or intestinal obstruction rather than urothelial malignancies. *Malaria* - Malaria is caused by *Plasmodium* species and typically results in **fever** and **splenomegaly**, not bladder cancer. - There is no significant association between malaria infections and the development of **transitional cell carcinoma**.

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: 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.

Q: What is the most common histological type of nephritis seen in systemic lupus erythematosus (SLE)?

Diffuse proliferative. ***Diffuse proliferative*** - This type is the most common form of nephritis associated with **systemic lupus erythematosus (SLE)** [1], characterized by extensive involvement of the renal glomeruli. - It presents with a combination of **proliferative lesions** and often leads to significant **renal impairment** and nephrotic syndrome [1]. *Membranous* - This type is less common in SLE and is more often associated with other conditions such as **infections** or **drugs**. - Histologically, it presents with **thickening of the glomerular membrane**, which is not the predominant feature in SLE. *Focal proliferative* - While focal proliferative glomerulonephritis can occur in SLE, it is not the most common subtype; it typically involves less than **50% of the glomeruli** [2]. - It usually presents with a milder clinical picture compared to **diffuse proliferative nephritis** [2]. *Mesangial* - Mesangial nephritis is characterized by **increased mesangial cell proliferation** and matrix expansion but does not account for the significant renal pathology seen in most SLE cases. - It is a less common type and often occurs alongside other forms of lupus nephritis rather than being the primary form. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 232. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 230-232.

Q: Transitional cell carcinoma of the bladder is associated with which of the following?

None of the options. ***Schistosomiasis*** - Schistosomiasis, particularly from *Schistosoma haematobium*, is a well-known risk factor for **transitional cell carcinoma of the bladder** due to chronic irritation and inflammation [1]. - The association arises due to the **presence of eggs in the bladder**, leading to calcification and eventually cancer development. *Malaria* - Malaria is primarily associated with **hemolytic anemia** and does not have a direct correlation with **bladder cancer**. - Its causative agents, *Plasmodium* species, do not typically lead to **urological malignancies** like transitional cell carcinoma. *Ascarasis* - Ascarasis, caused by *Ascaris lumbricoides*, primarily affects the **intestines** and is more associated with gastrointestinal issues. - There is no significant link between ascarasis and the **development of bladder cancer**. *Any of d above* - As this option suggests all listed conditions, it incorrectly implies that **malaria** and **ascarasis** are linked to bladder cancer, which they are not. - Transitional cell carcinoma is specifically associated with **schistosomiasis**, making this option misleading. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 968-970.

Q: Which of the following conditions is characterized by subendothelial electron-dense deposits within the glomerulus?

MPGN type I. ***MPGN type I*** - Subendothelial **electron-dense deposits** are characteristic of Membranoproliferative Glomerulonephritis (MPGN) type I [1]. - This condition is often associated with **immune complex deposition** and can involve the presence of complement abnormalities [1]. *IgA nephropathy* - Characterized by **IgA deposition** within the mesangial regions, not subendothelial deposits. - Typically presents with **hematuria** and **proteinuria** rather than electron-dense deposits. *Crescentic glomerulonephritis* - Primarily involves the formation of **crescents** in Bowman's space due to severe glomerular injury rather than subendothelial deposits. - Associated with **rapidly progressive renal failure** and **anti-GBM antibodies** or ANCA positivity. *Dense deposit disease* - Characterized by **intramembranous deposits** not subendothelial ones [1]. - Often associated with **C3 nephritic factor** leading to complement-mediated disease, distinct from MPGN type I. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 925-927.

Q: Kimmelstiel-Wilson lesion is characteristic of which condition?

Diabetic nephropathy. ***Diabetic nephropathy*** - Kimmelstiel-Wilson lesions are pathognomonic for **diabetic nephropathy**, appearing as nodular glomerulosclerosis [1]. - These lesions result from **hyperglycemia** leading to mesangial expansion and thickening of the glomerular basement membrane [2]. *HIV nephropathy* - Characterized by **focal segmental glomerulosclerosis** (FSGS) rather than Kimmelstiel-Wilson lesions. - Often presents with **proteinuria** and occurs in the context of **immune suppression**. *MPGN* - Membranoproliferative glomerulonephritis (MPGN) is associated with **proliferative glomerular changes** rather than Kimmelstiel-Wilson lesions. - Patients typically display **nephritic syndrome** with hematuria and decreased complement levels. *Hypertensive nephropathy* - Usually leads to **arteriosclerosis and hyaline changes** in the kidney, not Kimmelstiel-Wilson lesions. - Nephropathy manifests with **chronic kidney disease** and associated hypertension, without the specific lesion noted. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1121-1122. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1121.

Q: Which part of the kidney is first affected by ischemia in the context of acute kidney injury?

Outer medulla. ***Outer medulla*** - The **outer medulla** is particularly vulnerable to ischemia due to its high metabolic demand and limited blood supply. - Ischemic damage typically begins here as it receives blood supply from the **vasa recta**, which are more susceptible to drops in perfusion pressure. *Glumerulus* - The **glomerulus** is primarily affected in conditions like **glomerulonephritis**, not in acute ischemic injury where tubular structures are first impacted [1]. - It is well-perfused under normal conditions, making it less likely to be the first area affected during acute kidney injury. *Cortex* - The **cortex** is indeed involved in acute kidney damage but is not the first area affected by ischemia. - The cortical region can withstand lower perfusion volumes for a shorter time compared to the outer medulla. *Inner medulla* - The **inner medulla** is the last area to suffer from ischemic damage as it is more tolerant to **hypoxic conditions**. - It primarily encounters ischemia after the outer medulla has already been compromised, thus not the first area affected. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 933.

Question 1

Oncocytic carcinoma arises from -

Accepted Answer

Collecting duct (intercalated cells)

Answer

Perivascular region

Answer

Renal glomerulus

Answer

Loop of Henle

Question 2

What is the most important prognostic factor of Wilms tumour?

Accepted Answer

Histopathology

Answer

Mutation of WT1 gene

Answer

Ploidy of cells

Answer

Age < 1 yr

Question 3

What is the most significant risk factor for transitional cell carcinoma of the bladder?

Accepted Answer

Schistosomiasis

Answer

Ascariasis

Answer

Malaria

Answer

None of the options

Question 4

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 5

Mitochondrial abnormalities are associated with which of the following conditions?

Accepted Answer

Leigh syndrome

Answer

Krabbe's disease

Answer

Fabry disease

Answer

Fanconi syndrome

Question 6

What is the most common histological type of nephritis seen in systemic lupus erythematosus (SLE)?

Accepted Answer

Diffuse proliferative

Answer

Mesangial

Answer

Focal proliferative

Answer

Membranous

Question 7

Transitional cell carcinoma of the bladder is associated with which of the following?

Accepted Answer

None of the options

Answer

Malaria

Answer

Schistosomiasis

Answer

Ascariasis

Question 8

Which of the following conditions is characterized by subendothelial electron-dense deposits within the glomerulus?

Accepted Answer

MPGN type I

Answer

Crescentic glomerulonephritis

Answer

Dense deposit disease

Answer

IgA nephropathy

Question 9

Kimmelstiel-Wilson lesion is characteristic of which condition?

Accepted Answer

Diabetic nephropathy

Answer

HIV nephropathy

Answer

MPGN

Answer

Hypertensive nephropathy

Question 10

Which part of the kidney is first affected by ischemia in the context of acute kidney injury?

Accepted Answer

Outer medulla

Answer

Cortex

Answer

Inner medulla

Answer

Glomerulus

Renal Pathology — MCQs

Renal Pathology — MCQs

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