TiSBU Urologia common mistakes
TiSBU Urologia · Understand the traps and how to avoid them.
Classifying a renal mass as benign or malignant on imaging alone and committing to a single diagnosis without integrating size, enhancement pattern, and patient risk, then choosing management (partial vs radical nephrectomy vs ablation vs surveillance) from that single label.
Candidates memorise that clear-cell RCC is enhancing and lipid-poor, then over-apply enhancement thresholds; they forget that oncocytoma and angiomyolipoma can mimic RCC and that biopsy has a defined role in equivocal or small masses. The habit comes from pattern-matching on a single descriptor rather than building a differential with pretest probability.
What to do instead
For every renal mass question, explicitly list the differential (RCC subtypes, oncocytoma, AML, metastatic, urothelial), state which imaging features favour each, and justify the management choice by size, patient comorbidity, and renal function. Practise 10 vignettes writing a one-line differential before the answer.
Staging prostate cancer by PSA alone or by Gleason score alone, and then mis-assigning risk group and the corresponding treatment option.
PSA, grade group, and clinical T stage are learned separately, so candidates anchor on the most salient number in the stem. Risk stratification is a composite rule (D'Amico/NCCN/EAU) and requires all three axes plus biopsy cores and imaging.
What to do instead
Drill the risk-group table until each group can be reconstructed from memory, then answer every prostate vignette by writing PSA, grade group, and cT before selecting management. Include the caveat that MRI and genomic classifiers refine but do not replace the triad.
Treating every obstructing stone as an emergency and every febrile obstructed kidney as a routine admission, i.e. failing to separate infected obstruction (needs urgent decompression) from uncomplicated colic (needs analgesia and elective stone clearance).
The stone-size and location rules are well memorised, but the decision node that changes outcome is the presence of fever, sepsis, or a solitary kidney. Candidates conflate 'obstructed' with 'infected' and skip the decompression step, or over-treat a pain-only colic with emergency ureteroscopy.
What to do instead
Use a fixed two-question algorithm on every stone question: (1) is there infection or sepsis? (2) is there an obstructed solitary or transplanted kidney or AKI? If yes to either, decompress (nephrostomy or stent) first; otherwise manage by size, location, and composition. Rehearse with 8 mixed vignettes.
Choosing the surgical approach for BPH/LUTS by prostate volume alone without checking whether the obstruction is bladder outlet versus detrusor underactivity, and without matching the technique to prostate size and anatomy.
Candidates memorise 'TURP for small, open prostatectomy for large' and apply it mechanically, forgetting urodynamics in ambiguous cases, the role of medical therapy first, and size thresholds that determine laser enucleation or simple prostatectomy. They also omit anticoagulation status, which drives laser choice.
What to do instead
For each BPH vignette, state IPSS, prostate volume, residual volume, renal function, anticoagulation, and whether urodynamics are indicated; then select medical vs minimally invasive vs resective surgery with the size threshold named explicitly. Build a one-page table of technique-to-volume thresholds.
Interpreting uroflowmetry, post-void residual, and urodynamics as standalone tests and diagnosing detrusor overactivity or obstruction from a single trace, rather than integrating the filling and voiding phases with the clinical picture.
The numeric cut-offs (Qmax, PVR, detrusor pressure) are easy to memorise, so candidates quote them as diagnostic rules. Urodynamics is a composite study whose value depends on the question being asked and on artefact recognition.
What to do instead
Practice reading complete urodynamic reports: state the question, describe filling phase, voiding phase, and the pressure-flow relationship, then give the diagnosis and its limitation. Learn the classic artefacts (pseudodyssynergia, catheter effect, poor flow from anxiety) as distractors.
Managing male infertility by ordering a semen analysis and proceeding straight to IVF referral, skipping the evaluation that changes management: repeat analysis, hormonal profile, varicocele assessment, and genetic testing for severe oligospermia or azoospermia.
The algorithm is long and candidates compress it. They also forget that azoospermia requires FSH, karyotype, and Y-chromosome microdeletion testing, and that varicocele repair can change the need for assisted reproduction.
What to do instead
Write the male infertility pathway from memory: two semen analyses at least a month apart, history and examination, FSH/LH/testosterone, karyotype and Y-microdeletion for non-obstructive azoospermia, CFTR testing for congenital bilateral absence of the vas deferens, then decide medical, surgical, or ART. Apply it to 6 vignettes.
Reassuring a parent about an undescended testis or a neonatal hydronephrosis without applying the time-dependent and grade-dependent rules (spontaneous descent by 6 months, antibiotic prophylaxis and follow-up by grade, timing of orchidopexy).
Paediatric urology questions look like benign vignettes, so candidates answer with general reassurance. The examinable content is the specific age threshold and the grade-based follow-up schedule, which are easily confused between conditions.
What to do instead
Build an age-and-grade grid: orchidopexy by 12–18 months, spontaneous descent expectations, hydronephrosis grade vs VCUG indication vs prophylaxis vs surgery, and vesicoureteral reflux grade vs management. Test yourself by covering the grid and reciting each row.
Confusing the indications and limitations of imaging modalities across the urinary tract, e.g. ordering CT urography as first-line for a young patient with haematuria or using ultrasound to exclude ureteric stones, and misreading the multiparametric MRI PI-RADS category as a diagnosis.
Each modality has a niche defined by radiation, contrast, and sensitivity by region. Candidates learn 'CT is best' as a slogan and forget dose reduction, pregnancy, renal impairment, and the fact that PI-RADS 3 is indeterminate and requires biopsy context.
What to do instead
Make a modality-by-indication matrix (haematuria, stone, renal mass, upper tract urothelial, prostate, testis, trauma) recording first-line, alternative, and contraindication. For PI-RADS, memorise that the score drives biopsy decision alongside PSA density and DRE, not a diagnosis.
In testicular and penile oncology, delaying orchiectomy for a suspected germ cell tumour while waiting for tumour markers or imaging, or under-staging by omitting markers and cross-sectional imaging before inguinal surgery; similarly mismanaging penile cancer by performing a local excision without assessing nodes.
Candidates treat markers as diagnostic confirmation rather than as staging and follow-up tools, and they forget that radical inguinal orchiectomy is both diagnostic and therapeutic and should not be delayed. Penile cancer nodal staging is under-studied and easily skipped.
What to do instead
For every testicular mass, state the sequence: scrotal ultrasound, markers (AFP, beta-hCG, LDH), CT chest/abdomen/pelvis, then inguinal orchiectomy, with sperm banking discussed. For penile cancer, always address primary lesion management plus inguinal node assessment (dynamic sentinel node biopsy vs lymphadenectomy by risk).
In genitourinary trauma and emergencies, ordering CT with contrast in an unstable patient or missing the retrograde urethrogram before catheterisation in suspected urethral injury, and failing to recognise the indications for immediate exploration in renal or bladder trauma.
ATLS priorities and urological specificity compete, and candidates default to the most informative test rather than the safest next step. Fournier gangrene and priapism also get delayed because candidates wait for imaging or try conservative measures beyond the time window.
What to do instead
Fix a trauma sequence: resuscitate, then decide stable vs unstable, then choose FAST/CT or retrograde urethrogram before catheter. Memorise absolute exploration indications and the time-critical rules for Fournier (immediate debridement) and priapism (aspiration within hours for ischaemic priapism). Rehearse with 5 emergency vignettes.