AIM • KMU Exam Practice
KMU Past Paper Practice
Topic 9 — Obstructive Uropathy and Lower Urinary Tract Dysfunction
Hydronephrosis, BPH, Incontinence and Urethral Stricture • 4th Year MBBS • 20 A-type Single Best Answer MCQs
Assessment scope follows the supplied Topic 9 curriculum and KMU-style practice requirements. :contentReference[oaicite:0]{index=0}
MCQ 1
Question:
A 24-year-old man is investigated for intermittent left loin discomfort. Ultrasound shows marked dilatation of the left renal pelvis and calyces, while the ureter below is not dilated and the bladder appears normal. Which anatomical level of obstruction best explains this pattern?
Options:
Distal urethra
Pelvi-ureteric junction
Bladder neck
Prostatic urethra
Distal ureter near the bladder
Correct Answer: Pelvi-ureteric junction
Explanation: Dilatation limited mainly to the renal pelvis and calyces with a non-dilated distal ureter localizes obstruction near the pelvi-ureteric junction.
MCQ 2
Question:
A nephrectomy specimen from a patient with longstanding obstructive uropathy shows a markedly dilated collecting system. Which additional gross change would most strongly support advanced hydronephrosis?
Options:
Diffuse cortical nodularity
Multiple subcapsular hemorrhages
Diffuse medullary calcification
Flattening of the renal papillae
Granular thickening of the capsule
Correct Answer: Flattening of the renal papillae
Explanation: Progressive pressure within the collecting system dilates the calyces and flattens the renal papillae before advanced parenchymal thinning develops.
MCQ 3
Question:
A 46-year-old woman has complete obstruction of the right ureter. Imaging confirms hydronephrosis of the right kidney, but serum creatinine remains within the reference range. Which explanation best accounts for this finding?
Options:
The opposite kidney maintains overall filtration
Obstruction increases filtration in the affected kidney
Hydronephrosis prevents tubular dysfunction
Ureteric obstruction does not influence renal filtration
Creatinine rises only when infection is present
Correct Answer: The opposite kidney maintains overall filtration
Explanation: Significant unilateral obstruction may damage one kidney while the contralateral functioning kidney preserves total GFR and therefore serum creatinine.
MCQ 4
Question:
A 67-year-old man with an enlarged prostate describes several urinary complaints. Which group represents predominantly storage symptoms rather than voiding symptoms?
Options:
Weak stream, hesitancy and straining
Intermittency, weak stream and incomplete emptying
Hesitancy, intermittency and prolonged voiding
Straining, weak flow and terminal dribbling
Urgency, frequency and nocturia
Correct Answer: Urgency, frequency and nocturia
Explanation: Storage LUTS arise during the bladder-filling phase and classically include urgency, increased frequency and nocturia.
MCQ 5
Question:
A 70-year-old man completes the seven symptom questions of the International Prostate Symptom Score and obtains a total score of 23. How should this symptom burden be classified?
Options:
Minimal
Mild
Severe
Borderline
Moderate
Correct Answer: Severe
Explanation: An IPSS of 20–35 represents severe LUTS. The score measures symptom burden and must still be interpreted with clinical assessment.
MCQ 6
Question:
Two men have similar IPSS totals, but one requests treatment urgently while the other is minimally concerned by his symptoms. Which additional component of the IPSS assessment best explains this difference in management preference?
Options:
Estimated prostate weight
Quality-of-life or bother question
Serum creatinine value
Digital rectal examination grade
Post-void residual volume
Correct Answer: Quality-of-life or bother question
Explanation: The separate quality-of-life item reflects how troublesome the urinary symptoms are to the patient and helps place the numerical score in clinical context.
MCQ 7
Question:
A 65-year-old man with bothersome BPH symptoms prefers a minimally invasive procedure that mechanically improves the prostatic urethral channel without conventional tissue resection. Which option best fits this description?
Options:
Open simple prostatectomy
Radical prostatectomy
Urethroplasty
Suprapubic cystostomy
Prostatic urethral lift
Correct Answer: Prostatic urethral lift
Explanation: A prostatic urethral lift is a minimally invasive approach that mechanically widens the prostatic urethral channel in appropriately selected patients.
MCQ 8
Question:
A 68-year-old man has been taking finasteride for BPH for several months. His urinary symptoms are improving, but he notices painless enlargement of breast tissue. Which adverse effect of his treatment best explains this complaint?
Options:
Gynecomastia
Acute urinary retention
Marked hypertension
Detrusor hyperreflexia
Urethral fibrosis
Correct Answer: Gynecomastia
Explanation: Finasteride alters androgen-dependent prostatic physiology and may cause sexual adverse effects as well as gynecomastia in some patients.
MCQ 9
Question:
A 42-year-old woman reports continuous dampness throughout the day and night. The leakage is not related to coughing, urgency or a sensation of bladder fullness. Which type of urinary incontinence best fits this pattern?
Options:
Stress incontinence
Urgency incontinence
Overflow incontinence
Continuous incontinence
Functional incontinence
Correct Answer: Continuous incontinence
Explanation: Continuous urinary leakage suggests persistent abnormal urine escape, such as from a fistula, ectopic drainage or severe sphincter failure.
MCQ 10
Question:
A 60-year-old woman with urgency incontinence has persistent symptoms despite bladder training. She cannot tolerate antimuscarinic adverse effects. Which alternative drug mechanism is most appropriate for improving bladder storage?
Options:
Inhibition of 5-alpha-reductase
Blockade of alpha₁ receptors
Stimulation of beta₃-adrenergic receptors
Blockade of androgen receptors
Stimulation of alpha₁ receptors
Correct Answer: Stimulation of beta₃-adrenergic receptors
Explanation: Beta₃-adrenergic agonists promote detrusor relaxation during the storage phase and are an alternative pharmacological approach for urgency symptoms.
MCQ 11
Question:
A 72-year-old man has chronic painless bladder distension, a weak urinary stream and a large residual volume after voiding. Imaging does not demonstrate a significant mechanical outlet obstruction. Which functional abnormality could still produce this pattern?
Options:
Excessive urethral mobility
Impaired detrusor contractility
Increased nocturnal ADH secretion
Increased pelvic-floor strength
Reduced renal concentrating ability alone
Correct Answer: Impaired detrusor contractility
Explanation: A poorly contracting detrusor may fail to empty the bladder, producing chronic retention, large residual volumes and overflow leakage even without fixed outlet obstruction.
MCQ 12
Question:
An 8-year-old child has passed urine during sleep since toilet training and has never maintained a prolonged period of nighttime dryness. Daytime urination is normal and examination is unremarkable. Which classification best describes this presentation?
Options:
Secondary nocturnal enuresis
Overflow urinary incontinence
Functional urinary incontinence
Stress urinary incontinence
Primary nocturnal enuresis
Correct Answer: Primary nocturnal enuresis
Explanation: Primary enuresis describes nighttime wetting in a child who has never achieved a sustained period of nighttime continence.
MCQ 13
Question:
A school-aged child with uncomplicated nocturnal enuresis improves markedly after receiving desmopressin. Which physiological abnormality is most directly being corrected by this treatment?
Options:
Excessive bladder outlet resistance
Pelvic-floor weakness during sleep
Excessive nocturnal urine production
Fibrotic narrowing of the urethra
Involuntary abdominal muscle contraction
Correct Answer: Excessive nocturnal urine production
Explanation: Desmopressin acts as an antidiuretic hormone analogue and decreases urine production during the night.
MCQ 14
Question:
Parents of a child with primary nocturnal enuresis choose an enuresis alarm rather than medication. What is the principal therapeutic objective of this approach?
Options:
Develop learned awakening in response to bladder filling
Increase renal filtration during sleep
Relax the external urethral sphincter permanently
Reduce bladder capacity at night
Suppress detrusor contraction pharmacologically
Correct Answer: Develop learned awakening in response to bladder filling
Explanation: An enuresis alarm conditions the child to recognize bladder filling and awaken before or during the onset of nighttime voiding.
MCQ 15
Question:
A 49-year-old man has progressive narrowing of the urethral meatus and weak urinary flow. Examination shows chronic pale inflammatory skin changes involving the glans and meatus. Which underlying disorder is a recognized cause of this type of urethral stricture?
Options:
Benign prostatic hyperplasia
Detrusor overactivity
Lichen sclerosus
Nocturnal enuresis
Stress incontinence
Correct Answer: Lichen sclerosus
Explanation: Lichen sclerosus is a chronic inflammatory condition that may involve the meatus and urethra, producing scarring and progressive narrowing.
MCQ 16
Question:
Histological examination of an anterior urethral stricture shows dense fibrosis extending beyond the urethral wall into surrounding erectile tissue. Which term best describes this pathological process?
Options:
Detrusor hypertrophy
Spongiofibrosis
Hydroureter
Prostatic hyperplasia
Papillary flattening
Correct Answer: Spongiofibrosis
Explanation: Spongiofibrosis is fibrosis extending into the corpus spongiosum around the anterior urethra and is an important pathological feature of urethral stricture.
MCQ 17
Question:
A 40-year-old man with suspected urethral narrowing has a progressively weak stream and prolonged voiding. Before anatomical imaging is performed, which investigation provides a simple objective assessment of urinary flow?
Options:
Serum PSA measurement
Renal biopsy
Cystometric bladder capacity alone
Uroflowmetry
Urine cytology
Correct Answer: Uroflowmetry
Explanation: Uroflowmetry objectively measures urinary flow and can demonstrate impaired emptying, although it does not by itself define the anatomical cause.
MCQ 18
Question:
A man undergoes urethral dilatation for a short stricture and initially has improved urinary flow. Several months later, his symptoms gradually recur. Which underlying principle best explains this recurrence?
Options:
The prostate inevitably enlarges after dilatation
Bladder training causes outlet obstruction
Detrusor overactivity causes urethral scarring
Hydronephrosis causes distal urethral narrowing
Fibrotic scar tissue may reform after mechanical widening
Correct Answer: Fibrotic scar tissue may reform after mechanical widening
Explanation: Dilatation enlarges the lumen mechanically but does not necessarily eliminate the underlying fibrotic tendency, so recurrence may occur.
MCQ 19
Question:
A 74-year-old man has longstanding bladder-outlet obstruction from BPH. Cystoscopy shows a thick-walled, trabeculated bladder. Which adaptation most directly accounts for this appearance?
Options:
Compensatory hypertrophy of the detrusor muscle
Atrophy of the urethral sphincter
Hyperplasia of the bladder epithelium
Fibrosis of the renal papillae
Dilated glomerular capillaries
Correct Answer: Compensatory hypertrophy of the detrusor muscle
Explanation: The bladder initially compensates for increased outlet resistance by generating greater pressure, producing detrusor hypertrophy and a trabeculated appearance.
MCQ 20
Question:
A 77-year-old man has untreated severe BPH for several years. He develops increasing residual urine, bilateral hydroureter and hydronephrosis. Which sequence best explains progression from lower urinary tract disease to upper tract damage?
Options:
Reduced androgen production → weak sphincter → renal scarring
Detrusor relaxation → low bladder pressure → calyceal collapse
Outlet resistance → incomplete emptying → raised upstream pressure → upper tract dilatation
Prostatic shrinkage → ureteric spasm → renal parenchymal loss
Increased renal filtration → bladder contraction → ureteric obstruction
Correct Answer: Outlet resistance → incomplete emptying → raised upstream pressure → upper tract dilatation
Explanation: Persistent bladder-outlet obstruction raises residual volume and urinary tract pressure, which can eventually transmit backward into both ureters and renal collecting systems.
