Nephrology & Urology · KIMS Secunderabad
Genitourinary Tuberculosis — When TB Spreads to the Kidneys and Urinary Tract
Genitourinary tuberculosis (GUTB) is the most common form of extrapulmonary tuberculosis, accounting for approximately 30 to 40% of all extrapulmonary TB cases. India bears the world's highest TB burden — over 2.8 million cases annually — and GUTB is an important but frequently delayed diagnosis in Hyderabad and across Telangana. The delay typically arises because GUTB mimics other common urological and nephrological conditions: the patient presents with recurrent urinary tract infections, haematuria, or obstructive uropathy, and is treated for these conditions repeatedly without the underlying TB being considered.
GUTB is caused by haematogenous spread of Mycobacterium tuberculosis from a primary focus — usually the lung — to the kidney. The kidney is the most common genitourinary organ affected; from the kidney, TB spreads downward via the urine to the ureter, bladder, prostate, seminal vesicles, epididymis, and testis. The classical clinical clue — sterile pyuria (white cells in the urine with a negative standard bacterial culture) — should always prompt AFB (acid-fast bacilli) testing of the urine.
Pathology — how TB damages the urinary tract
Renal TB
Begins as microscopic granulomas in the renal cortex. As the granulomas enlarge and caseate, cavities form in the parenchyma, communicating with the collecting system. Calcium deposits in the cavities produce the characteristic 'putty kidney' or 'autonephrectomy' on plain X-ray — a completely calcified, non-functioning kidney. Progressive granulomatous inflammation causes scarring and stricturing of the collecting system.
Ureteric TB
Fibrotic strictures at the ureteropelvic junction, the lower ureter, and the vesicoureteric junction — causing progressive hydronephrosis that may be irreversible if not treated early.
Bladder TB
Granulomatous cystitis causes a thickened, contracted bladder with reduced capacity. The bladder may be reduced to a volume of only 50 to 100ml — causing severe frequency, urgency, and incontinence. 'Thimble bladder' — fibrotic bladder contracture — is irreversible; bladder augmentation may be required.
Genital TB
Epididymal TB (chronic, painless epididymal swelling with a 'beads on string' feel of the vas deferens), prostatic TB, seminal vesicle TB (causing haematospermia). Bilateral epididymal obstruction causes obstructive azoospermia and male infertility.
Clinical features — the great masquerader
Sterile pyuria — the most important diagnostic clue. Persistent white cells in the urine with negative standard bacterial culture on three or more occasions. Every case of sterile pyuria should be investigated for GUTB.
Haematuria — microscopic or macroscopic, from renal or bladder mucosal involvement.
Recurrent 'UTI' not responding to antibiotics — bacteria do not grow on standard culture; the patient is repeatedly treated empirically without improvement.
Flank pain or loin discomfort — from ureteric obstruction or renal involvement.
Frequency and urgency — from bladder TB causing cystitis and reduced bladder capacity.
Painless epididymal swelling — in male genital TB. The hallmark is a chronic, non-tender firm mass in the epididymis.
Constitutional symptoms — low-grade fever, night sweats, weight loss, anorexia — in active disease, though many GUTB patients are entirely systemic-symptom-free.
Diagnosis at KIMS
Early morning urine for AFB (three consecutive specimens)
The most important diagnostic test. AFB culture on three consecutive early morning urine samples has a sensitivity of 80 to 90% for renal TB. Urine must be collected as the first voided specimen on waking — overnight pooling in the bladder concentrates mycobacteria. CBNAAT (Xpert MTB/RIF) on urine increases sensitivity and simultaneously detects rifampicin resistance.
Urine PCR for M. tuberculosis
Rapid and specific — results within 24 to 48 hours. Useful for rapid diagnosis while culture results are awaited.
Intravenous urogram (IVU) or CT urogram
The gold standard imaging investigation for GUTB. Characteristic findings: moth-eaten calyces, ureteric strictures (typically at the UPJ and VUJ), hydronephrosis above the strictures, calcified lesions within the kidney (caseous granulomas), autonephrectomy (completely calcified non-functioning kidney), and contracted bladder.
Cystoscopy and biopsy
Cystoscopy identifies bladder granulomas, mucosal ulceration, and thickened fibrotic bladder wall. Biopsy confirms granulomatous inflammation — caseating granulomas with Langerhans giant cells and AFB are pathognomonic. Cystoscopy also assesses bladder capacity — a capacity below 100ml indicates severe bladder TB requiring augmentation after ATT.
Chest X-ray and Mantoux test
Identifies active or old pulmonary TB. The primary source. A positive Mantoux (above 10mm in immunocompetent, above 5mm in immunocompromised) supports the diagnosis but is not specific for GUTB.
Treatment
Anti-tuberculosis therapy (ATT) — 6-month RNTCP/WHO regimen
First-line: isoniazid + rifampicin + pyrazinamide + ethambutol for 2 months (intensive phase), followed by isoniazid + rifampicin for 4 months (continuation phase). ATT treats the infection and halts further granuloma formation — but does not reverse established fibrotic strictures.
Ureteric stenting or percutaneous nephrostomy
For hydronephrosis from ureteric stricture — urgent drainage to preserve kidney function while ATT is given. A JJ stent placed endoscopically at the time of diagnosis maintains drainage during the 6 months of treatment.
Reconstructive urology after ATT
After completing the full ATT course: ureteral stricture reconstruction (laparoscopic or robotic ureteroplasty, Boari flap, or ileal ureter for long segment loss). Bladder augmentation (ileocystoplasty) for contracted bladder with capacity below 150ml. Epididymectomy for TB epididymal mass not resolving on ATT. These are performed by Dr. K. V. R. Prasad and the KIMS urology team.
Nephrectomy
For a non-functioning or minimally functioning kidney (below 10% function on DTPA) from advanced renal TB — particularly to prevent spread of viable organisms from a calcified 'autonephrectomy' kidney.
Book a Genitourinary TB Assessment at KIMS — Early Morning Urine AFB and CT Urogram Available
Frequently Asked Questions — Genitourinary Tuberculosis
Yes — and this is the reason GUTB is so frequently missed. The primary pulmonary TB infection may have been subclinical — causing no symptoms at all — and the patient has no history of lung disease or TB treatment. The haematogenous spread to the kidney may occur years after the primary infection, during a period of immune compromise (diabetes, HIV, malnutrition, steroid use, ageing). Many patients with GUTB have no cough, no haemoptysis, and no respiratory symptoms — their only presentation is urinary: sterile pyuria, haematuria, or recurrent UTI not responding to antibiotics. The chest X-ray may show old calcified lung lesions (healed primary TB) or may be entirely normal.
Sterile pyuria — white blood cells in the urine on dipstick or microscopy, with no bacterial growth on standard urine culture — is the hallmark of GUTB. Standard urine cultures use media that grow common bacteria (E. coli, Klebsiella) but do not support mycobacterial growth. Mycobacteria require special media (Lowenstein-Jensen or BACTEC) and longer incubation periods (4 to 8 weeks) to grow. When a patient has repeated episodes of pyuria that fail to grow on standard culture, GUTB must be excluded by AFB culture and CBNAAT on three early morning urine samples. Other causes of sterile pyuria (urethritis, interstitial cystitis, analgesic nephropathy) must also be considered.
The standard RNTCP/WHO first-line ATT regimen for GUTB is 6 months: 2 months of four-drug therapy (HRZE — isoniazid, rifampicin, pyrazinamide, ethambutol) followed by 4 months of two-drug therapy (HR — isoniazid and rifampicin). This is the same duration as pulmonary TB — longer regimens (9 to 12 months) were previously used for GUTB but are no longer recommended by current guidelines for drug-sensitive TB. Drug-resistant GUTB (MDR-TB or XDR-TB) requires longer regimens (18 to 24 months) with second-line agents — this is managed in coordination with the DOTS-Plus programme and chest medicine team at KIMS.
Yes — bladder TB causes progressive fibrosis of the bladder wall, replacing the normal elastic muscular wall with scar tissue. This contracted, fibrotic bladder — the 'thimble bladder' — has dramatically reduced capacity (sometimes as little as 50ml, compared to normal bladder capacity of 400 to 600ml). The patient urinates every 15 to 30 minutes, day and night — a severely disabling condition. The bladder contracture is irreversible — ATT stops further fibrosis but cannot reverse established scar tissue. Bladder augmentation surgery (ileocystoplasty — opening the contracted bladder and patching it with a segment of small intestine to increase capacity) is the definitive treatment for established thimble bladder. At KIMS, bladder augmentation for TB-contracted bladder is performed by Dr. K. V. R. Prasad after completion of the full ATT course.
KIMS Secunderabad — Dr. E. Ravi (nephrology) and Dr. K. V. R. Prasad (urology, 28+ years), early morning urine AFB culture and CBNAAT, CT urogram, cystoscopy with biopsy, JJ stenting for ureteric obstruction, full ATT with monitoring, reconstructive surgery post-ATT (ureteroplasty, bladder augmentation, epididymectomy). NABH and NABL accredited. Call 040-4488-5000.