Urology Practice Questions

Q: A 75-year-old man presents with a 24-hour history of acute onset left loin pain, which worsens intermittently and has not settled with simple analgesia. The patient has mild dementia and cannot recall his past medical history. Aspiration of synovial fluid from a previous episode showed negatively birefringent crystals. Which one of the following substances is likely to make up the majority of this man's calculus?

Uric acid. **Explanation:** The patient presents with classic **ureteric colic** (acute onset loin pain) and a significant history of **Gout**. The key diagnostic clue is the "negatively birefringent crystals" found in synovial fluid, which are pathognomonic for **Monosodium Urate** crystals. Patients with gout have hyperuricemia, which predisposes them to the formation of **Uric acid calculi**. * **Why Uric Acid is correct:** Approximately 20% of patients with gout develop uric acid stones. These stones form in acidic urine (pH < 5.5) where uric acid becomes insoluble. Unlike most renal stones, pure uric acid stones are **radiolucent** on X-ray but visible on CT (NCCT). * **Why other options are incorrect:** * **Calcium Oxalate:** While this is the most common type of renal stone overall, it is not specifically associated with gouty arthritis. * **Triple Phosphate (Struvite):** These are "infection stones" (Magnesium Ammonium Phosphate) associated with urease-producing bacteria like *Proteus*. They typically form staghorn calculi. * **Xanthine:** These are extremely rare and associated with hereditary xanthine oxidase deficiency or Allopurinol therapy (rarely). **Clinical Pearls for NEET-PG:** 1. **Crystal Morphology:** Uric acid crystals in urine are typically **rhomboid** or rosette-shaped. 2. **Radiology:** "Uric acid stones are **L**ucent on X-ray but **D**ense on CT" (L for Lucent). 3. **Management:** The mainstay of treatment for uric acid stones is **urinary alkalinization** (using Potassium Citrate) to a pH of 6.5–7.0, which can often dissolve the stones (Chemolysis). 4. **Birefringence:** Remember: **G**out = **N**egative (GN); **P**seudogout (Calcium Pyrophosphate) = **P**ositive (PP).

Q: What is the most important diagnostic investigation for renal cell carcinoma?

CT scan of abdomen and pelvis. **Explanation:** The gold standard and most important diagnostic investigation for Renal Cell Carcinoma (RCC) is a **Contrast-Enhanced CT (CECT) scan of the abdomen and pelvis**. **1. Why CT Scan is the Correct Answer:** A CECT is the primary modality for diagnosis, staging, and surgical planning. It provides critical information regarding: * **Tumor Characteristics:** RCC typically shows significant enhancement (wash-in) during the arterial phase followed by washout. * **Staging:** It accurately assesses local extension, lymph node involvement, and the presence of venous thrombus in the renal vein or Inferior Vena Cava (IVC). * **Anatomy:** It helps in planning a partial vs. radical nephrectomy by mapping the vascular anatomy. **2. Why Other Options are Incorrect:** * **USG (Ultrasound):** Usually the **initial** investigation or screening tool for incidental findings, but it lacks the sensitivity and detail required for definitive staging and surgical planning. * **MRI:** Reserved for specific cases, such as patients with contrast allergies, renal failure, or when there is a need to better define the extent of a thrombus in the IVC. It is not the first-line "most important" test. * **PET CT:** Not routinely used for the primary diagnosis of RCC as many renal tumors are not FDG-avid. Its role is limited to detecting distant metastases or monitoring recurrence. **Clinical Pearls for NEET-PG:** * **Triad of RCC:** Hematuria, flank pain, and palpable mass (seen in <10% of cases; signifies advanced disease). * **Most common histological type:** Clear cell carcinoma (originates from Proximal Convoluted Tubule). * **Staging:** Robson’s classification (historical) and TNM staging (current). * **Paraneoplastic syndromes:** RCC is known as the "Internist's tumor" due to associations with polycythemia (EPO), hypercalcemia (PTHrP), and Stauffer’s syndrome (non-metastatic hepatic dysfunction).

Q: What is the most common organism causing post-transplant lymphoma?

Epstein-Barr virus (EBV). **Explanation:** Post-transplant lymphoproliferative disorder (PTLD) is a serious complication following solid organ or hematopoietic stem cell transplantation, primarily due to the therapeutic immunosuppression required to prevent graft rejection. **Why Option A is correct:** The vast majority (up to 90%) of PTLD cases are associated with the **Epstein-Barr virus (EBV)**. In a healthy individual, EBV infects B-cells, but T-cells keep their proliferation in check. In transplant recipients, immunosuppression (especially drugs like Tacrolimus or Cyclosporine) impairs T-cell surveillance. This allows EBV-infected B-cells to proliferate unchecked, leading to B-cell hyperplasia and, eventually, malignant lymphoma. **Why the other options are incorrect:** * **Option B (HHV-6):** While HHV-6 is common post-transplant, it typically causes roseola, encephalitis, or bone marrow suppression, not lymphoma. * **Option C (HSV-1):** HSV-1 usually causes mucocutaneous lesions (cold sores) or esophagitis in immunocompromised patients but does not have oncogenic potential for lymphoma. * **Option D (HTLV-1):** This virus is associated with Adult T-cell Leukemia/Lymphoma (ATLL), but it is not the primary driver of post-transplant lymphoproliferative disorders. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** The highest risk for PTLD occurs in **EBV-negative recipients** receiving an organ from an **EBV-positive donor** (mismatch). * **Organ Type:** PTLD is more common in multivisceral and intestinal transplants compared to kidney transplants. * **Management:** The first-line treatment for PTLD is the **reduction of immunosuppression**. If this fails, the monoclonal antibody **Rituximab** (anti-CD20) is the drug of choice. * **Timeline:** Most cases occur within the first year post-transplant (early-onset PTLD).

Q: A 50-year-old female presents with abdominal pain and anuria. Radiological studies reveal bilateral impacted ureteric stones with hydronephrosis. Urine analysis shows RBCs and pus cells. Serum creatinine is 16 mg/dL and blood urea is 200 mmol/L. What should be the immediate treatment?

J stent drainage. **Explanation:** The patient presents with **obstructive uropathy** leading to acute renal failure (Creatinine 16 mg/dL, Urea 200 mmol/L) and potential sepsis (pus cells in urine). In cases of bilateral ureteric obstruction with azotemia, the immediate priority is **decompression of the collecting system** to restore renal function and prevent permanent nephron damage. **1. Why C is correct:** **Double J (DJ) stenting** or Percutaneous Nephrostomy (PCN) are the gold-standard emergency treatments for obstructive uropathy. Stenting bypasses the obstruction, allows infected urine to drain, and stabilizes the patient’s renal parameters. Once the creatinine levels normalize and the infection is controlled, definitive stone management can be planned. **2. Why other options are incorrect:** * **A & B (Lithotripsy/URS):** These are definitive treatments for stones. However, they are **contraindicated** in the acute phase of obstruction with renal failure and infection. Performing these procedures on an unstable, uremic patient significantly increases the risk of urosepsis and surgical complications. * **D (Hemodialysis):** While the creatinine is very high, the underlying cause is **post-renal (obstructive)**. Dialysis may temporarily lower toxins but does not address the mechanical obstruction. Decompression (DJ stent) often leads to a rapid decline in creatinine, potentially making dialysis unnecessary. **Clinical Pearls for NEET-PG:** * **Emergency Urology Triad:** Fever + Flank Pain + High Creatinine = Surgical Emergency (Needs immediate drainage). * **Choice of Drainage:** DJ stent is preferred if the patient is stable; PCN is preferred if the patient is in septic shock or if stenting fails. * **Post-obstructive Diuresis:** After relief of bilateral obstruction, monitor the patient for massive diuresis and electrolyte imbalances.

Q: What stage is a high inguinal orchiectomy for teratoma testes with involved epididymis?

Stage I. **Explanation:** The staging of testicular germ cell tumors (like teratoma) follows the **TNM staging system**. In this case, the tumor is confined to the testis and the epididymis without evidence of lymphatic or distant spread. 1. **Why Stage I is correct:** According to the AJCC staging, **Stage I** (specifically Pathological T1 or T2) includes tumors limited to the testis and epididymis. Involvement of the epididymis does not upgrade the stage beyond Stage I, provided there is no nodal or distant metastasis. Since the question mentions only the local involvement (testis and epididymis) following a high inguinal orchiectomy, it remains Stage I. 2. **Why the other options are wrong:** * **Stage II:** Requires the presence of regional lymph node metastasis (retroperitoneal lymph nodes). * **Stage III:** Involves non-regional lymph node involvement (e.g., supraclavicular) or distant metastasis (e.g., lungs, liver). Stage III A specifically refers to distant nodal or minor pulmonary metastasis with low tumor markers. * **Stage IV:** This stage is not typically used in the AJCC TNM classification for testicular cancer; the system ends at Stage III, which is further subdivided based on tumor markers (S category). **High-Yield Clinical Pearls for NEET-PG:** * **Standard of Care:** The initial treatment and diagnostic step for any suspicious testicular mass is a **High Inguinal Orchiectomy**. Scrotal biopsy/orchiectomy is contraindicated due to the risk of altering lymphatic drainage (scrotal skin drains to inguinal nodes, while testes drain to retroperitoneal nodes). * **Tumor Markers:** Always remember the markers: **AFP** (never raised in pure seminoma), **hCG**, and **LDH**. * **Lymphatic Spread:** The primary nodal station for the right testis is the inter-aortocaval nodes; for the left, it is the para-aortic nodes.

Q: Rupture of the membranous urethra most commonly occurs due to:

Fixity of the urethra. The membranous urethra is the most vulnerable part of the male urethra during pelvic fractures. Understanding its anatomy is crucial for NEET-PG. ### **Why "Fixity of the urethra" is correct:** The membranous urethra passes through the **urogenital diaphragm** (perineal membrane), which firmly anchors it to the pubic bone via the puboprostatic ligaments. In cases of pelvic fractures (especially "butterfly" fractures of the pubic rami), the pelvic bones shift. Because the membranous urethra is **fixed** to the pelvic floor while the prostatic urethra moves with the bladder, a **shearing force** is generated at the junction. This leads to partial or complete transection of the urethra. ### **Why other options are incorrect:** * **Thin unsupported wall:** While the membranous urethra is thin, its lack of support is secondary to its anatomical position. The primary mechanism of injury is the mechanical shear caused by its rigid attachment. * **Angulation:** Although the urethra has natural curves (e.g., the subpubic angle), these do not contribute to rupture during trauma as much as the lack of mobility does. * **Proximity to the bladder:** Proximity alone does not cause rupture; rather, it is the differential movement between the fixed urethra and the mobile bladder/prostate that causes the tear. ### **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Pelvic fracture (e.g., Road Traffic Accidents). * **Classic Triad:** Blood at the external meatus, inability to void, and a palpable distended bladder. * **Digital Rectal Exam (DRE):** May reveal a **"High-riding prostate"** due to the disruption of the puboprostatic ligaments. * **Investigation of Choice:** Retrograde Urethrogram (RUG). **Contraindication:** Do not attempt catheterization before RUG if a urethral tear is suspected. * **Bulbar Urethra:** Most common site of rupture in **"straddle injuries"** (falling astride a firm object).

Q: What is the most common type of renal stone?

Calcium oxalate. **Explanation:** **Calcium oxalate** is the most common type of renal stone worldwide, accounting for approximately **75–80%** of all urinary calculi. These stones typically form in acidic or neutral urine. They are radiopaque (visible on X-ray) and are further classified into two types: Calcium oxalate monohydrate (Whewellite), which are hard and dumbbell-shaped, and Calcium oxalate dihydrate (Weddellite), which are envelope-shaped. **Analysis of Incorrect Options:** * **Triple phosphate & Struvite stones (Options B & C):** These terms are often used interchangeably. Struvite stones (Magnesium Ammonium Phosphate) account for about 10–15% of cases. They are "infection stones" associated with urea-splitting organisms like *Proteus* and *Klebsiella* and often form large **Staghorn calculi** in alkaline urine. * **Urate stones (Option D):** Uric acid stones account for about 5–10% of stones. They are unique because they are **radiolucent** (not seen on X-ray) but visible on CT scans. They form in persistently acidic urine and are associated with gout or high cell turnover. **High-Yield Clinical Pearls for NEET-PG:** * **Most common constituent:** Calcium oxalate (specifically Monohydrate is more common than Dihydrate). * **Most common cause of Calcium stones:** Idiopathic hypercalciuria (not hyperparathyroidism). * **Appearance on Microscopy:** * Calcium oxalate dihydrate: **Envelope/Pyramid** shape. * Calcium oxalate monohydrate: **Dumbbell/Oval** shape. * Struvite: **Coffin-lid** appearance. * Cystine: **Hexagonal** (associated with "benzene ring" shape). * **Investigation of Choice:** Non-Contrast Enhanced CT (NCCT) KUB is the gold standard for all renal stones.

Q: What is the upper dose limit of lignocaine in a 70 kg adult?

200 mg. **Explanation:** The maximum safe dose of lignocaine (lidocaine) is a critical high-yield topic in surgery and anesthesia. The dosage is calculated based on the patient's body weight and whether a vasoconstrictor (like adrenaline) is added. **Why 200 mg is correct:** For a standard adult, the maximum dose of **plain lignocaine** (without adrenaline) is **3 mg/kg**. * Calculation: $3\text{ mg/kg} \times 70\text{ kg} = 210\text{ mg}$. * Among the given options, **200 mg** is the closest standard clinical limit. In many clinical guidelines, a flat maximum of 200 mg is often cited for plain lignocaine to prevent Local Anesthetic Systemic Toxicity (LAST). **Analysis of Incorrect Options:** * **A (100 mg) & B (150 mg):** These doses are well below the toxic threshold for a 70 kg adult and would result in inadequate anesthesia for larger procedures. * **D (250 mg):** This exceeds the safe limit for plain lignocaine (210 mg). However, if adrenaline were added, the limit would increase to 7 mg/kg (approx. 500 mg), making 250 mg safe in that specific context. **High-Yield Clinical Pearls for NEET-PG:** 1. **With Adrenaline:** The maximum dose increases to **7 mg/kg** because adrenaline causes vasoconstriction, slowing systemic absorption. 2. **Mechanism:** Lignocaine works by blocking **voltage-gated sodium channels** in the neuronal membrane. 3. **Toxicity (LAST):** Initial signs include perioral numbness, metallic taste, and tremors, progressing to seizures and cardiac arrest. 4. **Antidote:** Intravenous **20% Lipid Emulsion** (Intralipid) is the specific treatment for severe systemic toxicity. 5. **Urology Context:** In procedures like TRUS biopsy or catheterization, lignocaine 2% jelly is commonly used; remember that mucosal absorption is rapid.

Question 1

A 75-year-old man presents with a 24-hour history of acute onset left loin pain, which worsens intermittently and has not settled with simple analgesia. The patient has mild dementia and cannot recall his past medical history. Aspiration of synovial fluid from a previous episode showed negatively birefringent crystals. Which one of the following substances is likely to make up the majority of this man's calculus?

Accepted Answer

Uric acid

Answer

Xanthine

Answer

Triple phosphate

Answer

Calcium oxalate

Question 2

What is the most important diagnostic investigation for renal cell carcinoma?

Accepted Answer

CT scan of abdomen and pelvis

Answer

MRI

Answer

USG

Answer

PET CT

Question 3

What is the most common organism causing post-transplant lymphoma?

Accepted Answer

Epstein-Barr virus (EBV)

Answer

Human herpesvirus 6 (HHV-6)

Answer

Herpes simplex virus 1 (HSV-1)

Answer

Human T-lymphotropic virus 1 (HTLV-1)

Question 4

Treatment of Stage I Bladder carcinoma includes all except?

Accepted Answer

Local excision

Answer

Intravesical Chemotherapy

Answer

Radiotherapy

Answer

BCG

Question 5

A 50-year-old female presents with abdominal pain and anuria. Radiological studies reveal bilateral impacted ureteric stones with hydronephrosis. Urine analysis shows RBCs and pus cells. Serum creatinine is 16 mg/dL and blood urea is 200 mmol/L. What should be the immediate treatment?

Accepted Answer

J stent drainage

Answer

Lithotripsy

Answer

Ureteroscopic removal of stones

Answer

Hemodialysis

Question 6

What stage is a high inguinal orchiectomy for teratoma testes with involved epididymis?

Accepted Answer

Stage I

Answer

Stage II

Answer

Stage III A

Answer

Stage IV

Question 7

Rupture of the membranous urethra most commonly occurs due to:

Accepted Answer

Fixity of the urethra

Answer

Thin unsupported wall

Answer

Angulation

Answer

Proximity to the bladder

Question 8

Which of the following statements is true about seminoma of the testis?

Accepted Answer

It commonly occurs in the 6th decade.

Answer

An undescended testis is more liable to develop this tumor.

Answer

Histologically, it resembles dysgerminoma of the ovary.

Answer

It is radioresistant.

Question 9

What is the most common type of renal stone?

Accepted Answer

Calcium oxalate

Answer

Triple phosphate

Answer

Struvite stone

Answer

Urate stone

Question 10

What is the upper dose limit of lignocaine in a 70 kg adult?

Accepted Answer

200 mg

Answer

100 mg

Answer

150 mg

Answer

250 mg

Urology — MCQs

Urology — MCQs

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