ABU Urology common mistakes
ABU Urology · Understand the traps and how to avoid them.
Reads the diagnosis in the first line of the vignette and immediately selects the treatment that usually goes with it, without re-reading for the one detail that disqualifies the reflex answer (solitary kidney, eGFR 35, tumour abutting the hilum, prior pelvic radiation, contralateral non-functioning unit).
Board stems front-load the diagnosis and back-load the modifiers; under time pressure the diagnosis fires a stored 'classic management' script before the modifiers have been processed.
What to do instead
Before looking at the options, write down the three modifiers that would change management for that diagnosis, then confirm each against the stem. If the stem supplies a number (eGFR, tumour size, PSA, residual volume), it was put there to be used.
Answers staging, grading and risk-group questions from memory of older thresholds: calling Gleason 3+4=7 'low risk', quoting a superseded PSA cut-off, or misremembering which nodal or metastatic site defines N1 or M1 for a given cancer.
Training-era and read-era tables blur together, and examiners deliberately write to current WHO grade groups and the current AJCC edition.
What to do instead
Rebuild the risk group from its components (PSA, grade group, clinical stage) rather than recalling a label, and fix the 3+3=1 through 4+4=5 grade-group conversion in memory so it cannot drift under stress.
Chooses shockwave lithotripsy by default for any stone under 2 cm without screening the features that predict SWL failure: distal ureteric location with a large burden, Hounsfield units above roughly 1000, long skin-to-stone distance, obesity, pregnancy, distal obstruction, or a narrow calyceal infundibulum.
SWL is the 'safe' option in many stems and the size rule is easier to recall than the exclusion list, so the exclusion list is never applied.
What to do instead
Run a fixed four-item filter before selecting a modality: composition (Hounsfield units, radiolucency), location and calyceal anatomy, patient factors (BMI, pregnancy, anticoagulation, obstruction), and total burden. Any positive item pushes the answer toward ureteroscopy or PCNL.
For an obstructing stone with fever, rigors, pyuria or hypotension, selects definitive stone clearance or antibiotics alone instead of emergency decompression.
The stone is the visible abnormality, so attention goes to removing it, while the septic physiology is read as background context.
What to do instead
Treat obstruction plus infection as a decompression indication: nephrostomy or stent, resuscitation and culture-directed antibiotics now, definitive stone treatment once stable. Treat the words 'fever, rigors, hypotension' next to a stone as a hard stop.
Labels urgency incontinence as detrusor overactivity and stops reasoning there, without checking post-void residual, excluding obstruction or a neurological lesion, and, in a neurogenic patient, without matching bladder management to the level of the lesion.
Detrusor overactivity is the most familiar urodynamic finding, and lesion-level neuro-urology is studied separately from tracing interpretation, so the two never get joined in the answer.
What to do instead
For every voiding complaint state the PVR first. For every neurogenic patient state the lesion level, whether the detrusor is overactive or areflexic, and whether there is sphincter dyssynergia, then check leak point pressure and compliance before choosing antimuscarinics, clean intermittent catheterisation, sphincterotomy or augmentation.
Starts testosterone replacement on a single low total testosterone drawn in the afternoon or during acute illness, with no confirmatory morning fasting level, no LH/FSH, no haematocrit, no PSA and no discussion of fertility.
The number in the stem looks definitive, and the diagnostic algorithm (two morning samples, then gonadotropin interpretation) is recall-heavy rather than conceptual.
What to do instead
Always require two morning fasting total testosterone values plus LH/FSH to separate primary from secondary hypogonadism, and check haematocrit, PSA and fertility desire before treating. In a man who wants children, the answer is hCG or a SERM, not exogenous testosterone.
Orders an ultrasound to locate a non-palpable undescended testis, or applies adult thresholds to paediatric data (hydronephrosis grade, testicular volume, bladder capacity, any PSA).
Adult diagnostic reflexes and adult reference ranges are over-learned, while examination under anaesthesia and laparoscopy for the impalpable testis are under-rehearsed.
What to do instead
For a non-palpable testis the pathway is examination under anaesthesia then laparoscopy, never imaging. For any paediatric value, convert to an age-based norm or formula (expected capacity roughly (age + 2) x 30 mL) before interpreting it.
Attributes early post-transplant oliguria to acute rejection and reaches for pulse steroids without excluding obstruction or leak by ultrasound, checking calcineurin-inhibitor levels and volume status, or reading the urine sodium and creatinine trend.
Rejection is the complication most emphasised in transplant teaching and the most dramatic distractor, so it captures the answer before a systematic check is made.
What to do instead
Use a fixed order for delayed graft function: ultrasound to exclude hydronephrosis, haematoma and urine leak; drug levels and haemodynamics; urine electrolytes for ATN; and only then biopsy with a view to treating rejection.
Places a urethral catheter in a trauma patient with a pelvic fracture, blood at the meatus, perineal haematoma or high-riding prostate; or plans an orthotopic neobladder without confirming manual dexterity, cognition, renal function and negative urethral margins.
Catheterisation is the habitual response to urinary retention, and diversion choice is remembered as a matter of preference rather than an eligibility checklist.
What to do instead
Blood at the meatus or suspected posterior urethral injury means retrograde urethrogram first and suprapubic diversion, never a blind catheter. For diversion, tick renal function, urethral margin status, dexterity and cognition, body habitus and patient preference before naming the operation.
Prescribes antibiotics for asymptomatic bacteriuria in a catheterised patient, a care-home resident or a diabetic, or labels a febrile UTI in a male 'uncomplicated' and gives a short course.
Pyuria and a positive culture feel like an indication on their own, and the complicated versus uncomplicated distinction is easy to skim past in a long stem.
What to do instead
Ask whether there are attributable urinary symptoms before treating; if there are none, do not treat except in pregnancy or before instrumentation. Then classify by host and anatomy, since male sex, obstruction, catheter, immunosuppression and renal impairment all make it complicated and mandate culture-directed therapy plus evaluation.