Epididymal Tuberculosis
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Direct answer
The epididymis is the most common site of male genital tuberculosis, usually reached haematogenously or by reflux from a tuberculous prostate, and presents in a young Indian man as a painless or aching, craggy, hard epididymal enlargement — classically starting at the tail — with a thickened, beaded vas deferens, sometimes a cold abscess or a chronic discharging scrotal sinus. Urine examination for acid-fast bacilli, semen culture, Mantoux and GeneXpert on aspirated pus support the diagnosis; ultrasound shows a heterogeneous epididymis with variable testicular involvement. Treatment is standard antitubercular therapy under the national programme; surgery is reserved for abscesses, sinuses, doubt about malignancy, or refractory disease.
What you must remember
- Male genital TB follows renal TB: prostate, epididymis (commonest site), seminal vesicle, vas, testis in descending frequency — epididymal disease with sterile pyuria points to a renal source upstream.
- The textbook signs examiners want verbatim: beading of the vas (granulomatous vasitis), craggy hard epididymis, cold abscess, and a scrotal sinus that discharges caseous material.
- Epididymal tail involvement first is typical (blood supply enters at the tail), distinguishing it from tumour, which is intratesticular.
- Systemic features are often absent; the presentation is chronic and painless or minimally painful, in the second to fourth decades.
- Investigations: early-morning urine for AFB on three days, semen culture and PCR, Mantoux, chest radiograph, ultrasound (heterogeneous epididymal mass with increased or decreased vascularity, hydrocele, testicular involvement); aspiration of abscess for AFB, culture and GeneXpert.
- Antitubercular therapy per the national programme (NTEP): an intensive phase followed by continuation, with drug-susceptible disease treated for six months in most genitourinary protocols.
- Surgery is adjunctive — drainage of abscess, excision of sinus tracts, epididymectomy or orchidectomy for destruction, doubt about malignancy, or failure to respond.
- Untreated disease destroys the epididymis and causes obstructive azoospermia — fertility counselling and sperm banking belong in the conversation.
Where students slip
Two reflexes cost marks. Incising a cold abscess in the scrotum creates a chronic tubercular sinus — aspiration (and later excision when sealed) is the discipline. And labelling every young painless scrotal lump "tumour until biopsy" without reading the examination clues (epididymal location, beaded vas, tail-first, hydrocele) misses the pattern Indian exams are built around; conversely, treating everything as TB while an embryonal carcinoma grows is the mirror-image error — the scored answer walks the middle: image, localise, confirm organism, involve the testis's markers when in doubt.
Frequently asked questions
Which is the most common site of male genital tuberculosis?
The epididymis, involved by haematogenous spread or retrograde extension from a tuberculous prostate, with the tail affected first.
What is beading of the vas deferens?
Nodular thickening of the vas from tuberculous vasitis — a classic physical sign of genital tuberculosis at examination.
How is epididymal tuberculosis investigated?
Early-morning urine for AFB, semen culture and PCR, Mantoux and chest radiograph, scrotal ultrasound, and aspiration of any abscess for AFB, culture and GeneXpert.
When is surgery required in epididymal TB?
For cold abscesses needing aspiration or excision, non-healing sinuses, doubt about malignancy, or masses that fail to regress after adequate antitubercular therapy — surgery is adjunctive, not primary.
Why should a tubercular scrotal abscess not be simply incised?
Incision of a cold abscess leads to a chronic discharging sinus; aspiration under cover of antitubercular therapy, with excision of the tract later if needed, is preferred.