USG Abdomen & Pelvis Report - Interpretation, Causes & Treatment

WHAT THE SCAN SHOWS

• Multiple views of both kidneys showing echogenic (bright white) foci with posterior acoustic shadowing - the classic US appearance of kidney stones
• Colon wall views showing diffuse thickening/oedema in the left colon segments
• All other organs (liver, gallbladder, pancreas, spleen, prostate) are completely normal

FINDING 1: Bilateral Small Renal Calculi (Kidney Stones)

What was found:

Why stones form - Common Causes:

1. Calcium oxalate stones (most common, ~80%) - caused by:
   • Inadequate fluid intake/dehydration (most common in India)
   • Hypercalciuria (excess calcium in urine)
   • Hyperoxaluria (excess spinach, nuts, tea, chocolate in diet)
   • Hypocitraturia (low citrate, which normally prevents stone formation)
2. Uric acid stones - caused by high-protein diet, gout, metabolic syndrome
3. Other risk factors at age 54:
   • Hot climate (increases insensible losses)
   • Low water intake
   • High salt/protein diet
   • Recurrent UTIs

The lifetime risk for developing renal calculi is 12%, with males being 2-3 times more at risk than females. - Brenner & Rector's The Kidney

Treatment Plan:

• High fluid intake - 2.5 to 3 litres of water per day; this is the single most effective intervention
• Medical Expulsive Therapy (MET): Alpha-blockers (tamsulosin 0.4 mg/day) - relaxes the ureter and helps the stone pass
• Pain management: NSAIDs (diclofenac/ketorolac) for renal colic episodes
• Avoid: Oxalate-rich foods (spinach, tomatoes, nuts, chocolate), excess salt, red meat

• ESWL (Extracorporeal Shock Wave Lithotripsy): For stones <20 mm; breaks stones using shock waves externally - effective for kidney stones, especially non-lower pole
• Ureteroscopy (URS) + Laser Lithotripsy: Holmium:YAG laser through ureteroscope - safer and more efficient than older methods; used if stone descends to ureter
• PCNL (Percutaneous Nephrolithotomy): Reserved for large stones >20 mm - not needed here

Stones 4 mm or smaller pass with conservative treatment. Larger stones are more likely to need intervention. - Brenner & Rector's The Kidney

• 24-hour urine collection (calcium, oxalate, citrate, uric acid)
• Serum calcium, uric acid, PTH
• Urine pH and culture
• If recurrent stones: stone analysis by NCCT KUB

FINDING 2: Diffuse Left-Sided Colitis (Colon Wall Oedema)

What was found:

• Diffuse wall oedema (thickening) of:
  • Left half of the transverse colon
  • Descending colon
  • Rectosigmoid colon
• This distribution is the key diagnostic clue - it is left-sided and segmental, sparing the right colon and liver

What does this mean?

Causes - Differential Diagnosis:

Symptoms the patient likely has:

• Abdominal pain (left-sided cramps)
• Loose stools or diarrhoea, possibly with blood or mucus
• Urgency and tenesmus (if rectosigmoid involved)

Treatment:

1. Stool culture - to rule out infective cause (Salmonella, Shigella, C. diff, amoeba, etc.)
2. Colonoscopy with biopsy - to confirm diagnosis and distinguish IBD from ischaemic colitis
3. Blood tests: CBC (anaemia, leukocytosis), CRP/ESR (inflammation), stool for occult blood, LFT, renal function

• Oral rehydration, electrolyte replacement
• Antibiotics based on culture: Metronidazole (for amoebic/anaerobic), Ciprofloxacin (for bacterial)
• Avoid anti-motility agents like loperamide if infection suspected

• Bowel rest (NBM initially), IV fluids, nasogastric decompression if needed
• Broad-spectrum antibiotics (to prevent bacterial translocation)
• Address underlying cardiovascular risk factors (BP, lipids, diabetes)
• Avoid vasoconstrictors (NSAIDs, decongestants)
• Most mild cases resolve in 1-2 weeks; severe ischaemia may need surgery

• Aminosalicylates (mesalazine) - first line for mild-moderate UC
• Corticosteroids for acute flares
• Immunosuppressants (azathioprine) for chronic/refractory cases
• Biologics (infliximab) for severe/refractory cases

SUMMARY & NEXT STEPS

Important: This report must be reviewed with the treating physician (Dr. Bhanupratap Hosakeri). The colitis pattern requires colonoscopy to distinguish between ischaemia, infection, and IBD - each has very different long-term management. The 5.8 mm stone needs urological follow-up.

Latest Clinical Guidelines: Management of Small Asymptomatic Renal Calculi

What the Latest Evidence Shows (2025 Meta-analysis)

AUA 2025/2026 Guideline Recommendations

Active Surveillance vs. Prophylactic Intervention

• SWL vs. observation for <15 mm asymptomatic calyceal stones: Prophylactic SWL did NOT offer any advantage over observation in stone-free rates (28% SWL vs. 17% observation; p=0.06), quality of life, kidney function, or hospital admissions. However, observation was linked to a greater incidence of unscheduled invasive procedures.
• SWL vs. URS vs. observation for <10 mm lower pole stones (RCT): At 24 months, SWL achieved stone-free rates of 90% and URS 92%, vs. only 10% with observation. However, the clinical relevance of this - given that stones were asymptomatic - remains debated.
• Same-session treatment during ureteroscopy (Sorensen et al. RCT): When incidental secondary kidney stones ≤6 mm were treated at the time of ureteroscopy for another stone, relapse was significantly lower (16%) vs. observation (63%), at a longer interval (1632 vs. 934 days), with no increase in complication rates. This supports opportunistic treatment.

AUA Guidance Principle:

• Stone size and growth (≥1 mm/year growth = higher surgical risk)
• Stone location (lower pole vs. elsewhere)
• Patient goals, preferences, comorbidities
• Resource availability and physician expertise

EAU 2026 Guideline Recommendations

"The natural history of small, nonobstructing asymptomatic calculi is not well defined, and the risk of progression is unclear. There is still no consensus on the follow-up duration, timing, and type of intervention."

EAU Key Recommendations for Asymptomatic Renal Stones:

• Stone growth >5 mm detected on surveillance
• Development of symptoms (pain, haematuria, UTI, obstruction)
• Patient preference after counselling

• Higher odds of passage in: non-struvite, non-cystine stones, no anatomic abnormalities, single stone
• Multiple/bilateral stones (as in this patient) - lower spontaneous passage odds

Applying Guidelines to This Patient (Laxmanna, 54M)

Recommended Management Protocol (Evidence-Based)

1. Conservative / Lifestyle Measures (First Line - Both Guidelines)

• Fluid intake: ≥2.5 L/day (target urine output >2 L/day) - most effective single intervention
• Diet: Low sodium (<2.3 g/day), moderate animal protein, avoid high-oxalate foods (spinach, nuts, tea)
• Calcium: Do NOT restrict dietary calcium (paradoxically increases stone risk); normal intake (1000-1200 mg/day)
• Citrate-rich fluids: Lemon water, lime juice - inhibit calcium stone formation

2. Metabolic Evaluation (Recommended for Bilateral Stones)

• 24-hour urine: calcium, oxalate, citrate, uric acid, creatinine, sodium
• Serum: calcium, uric acid, creatinine, PTH
• Urine pH (target 6.0-7.0 for most stone types)
• Stone composition analysis if stone passes

3. Pharmacological Prevention (Based on Metabolic Workup)

4. Surveillance Schedule (EAU 2026)

• Initial: USG or low-dose CT KUB at baseline
• Follow-up: Annual USG abdomen; no need for CT unless symptoms develop or stone growth suspected
• Trigger for shorter interval: Any detected stone growth

5. Indications to Consider Intervention (AUA/EAU 2026)

• Stone growth ≥5 mm on surveillance
• New onset pain, haematuria, or febrile UTI
• Development of obstruction or hydronephrosis
• Patient request after informed discussion
• Solitary kidney or occupational risk (pilots, armed forces, remote workers)

6. Intervention Options When Needed

• ESWL - for non-lower pole stones, <20 mm
• Flexible Ureteroscopy (fURS) + Holmium laser - preferred for lower pole and most intrarenal stones; stone-free rates ~90-92%
• PCNL - reserved for stones >20 mm or complex anatomy (not applicable here)

Bottom Line