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Scrotal Ablation (Scrotectomy) in Dogs - Complete Surgical Guide

Definition

Indications

Per a 2014 study of 676 canine scrotal tumors, the most common scrotal neoplasms in dogs are round cell tumors (58.6%), mesenchymal tumors (13.6%), and melanocytic neoplasms (11.8%), with mast cell tumors comprising 54.6% of all round cell tumors.

Pre-Operative Preparation

Patient Evaluation

• Complete physical exam and assessment of scrotal tissue
• Blood work: CBC, biochemistry panel (especially in older dogs or those with neoplasia)
• Fine-needle aspirate (FNA) of any scrotal mass prior to surgery to guide margins
• Thoracic radiographs if malignant neoplasia is suspected (to rule out metastasis)
• Clipping: wide surgical clip of the entire perineal and inguinal region
• Positioning: dorsal recumbency, hindlimbs pulled cranially and secured

Anesthesia Protocol

• General anesthesia (intubated) with IV catheter placed
• Pre-medication: opioids (e.g., methadone, hydromorphone) + acepromazine or dexmedetomidine
• Induction: propofol or alfaxalone
• Maintenance: isoflurane/sevoflurane
• Loco-regional analgesia is highly recommended:
  • Intratesticular/intrafunicular block: 2% lidocaine or 0.5% bupivacaine
  • Splash block at closure: epinephrine (1 mg/mL) 1:9 diluted with 2% lidocaine (vasoconstriction + analgesia)
  • Splash block reduces post-op drainage and provides hemostasis of scrotal vasculature

Pre-surgical Planning

• Ink/mark the intended elliptical incision margins on the scrotal skin before draping
• Assess skin laxity - always err on the side of removing less skin initially, as you can always excise more but cannot replace removed skin
• Ensure the planned closure is tension-free

Surgical Technique - Step by Step

Step 1 - Patient Positioning and Draping

Dog positioned in dorsal recumbency, surgical site prepped and draped

Scrotal tissue isolated in the sterile field with drapes

Step 2 - Castration First

• Either prescrotal (standard) or scrotal approach to orchiectomy
• Both testicles are removed and spermatic cord stumps ligated (open or closed technique)
• Testicular vessels are ligated with transfixation ligatures using absorbable suture (e.g., PDS, Monocryl, or Vicryl)
• This step is completed before beginning the scrotal excision to keep tissue planes clean

Step 3 - Planning and Incising the Scrotal Ellipse

• An elliptical incision is planned at the base of the scrotum
• The ellipse should encompass ALL scrotal skin (both pouches), with the long axis oriented cranio-caudally
• Mark the margins with a surgical pen before incising
• The incision is made through skin and dartos muscle layer
• Key rule: Leave slightly more skin than you think you need - tension-free closure is paramount

Scrotal tissue being elevated showing tissue planes prior to excision

Step 4 - Tissue Dissection and Scrotal Removal

• Mosquito hemostatic forceps are placed into the right and left scrotal pouches to elevate the skin and dartos, protecting the underlying structures during dissection
• Careful blunt and sharp dissection is used to free the scrotal tissue
• The urethra runs immediately deep to the scrotum - protect it at all times
• Subcutaneous hemorrhage is controlled with:
  • Electrocautery (preferred)
  • Ligation
  • Temporary mosquito forceps application
• Once the scrotal tissue is excised, the underlying urethra becomes readily visible

Step 5 - Urethral Identification and Protection

• Identify the urethra visually (it lies in the perineal midline)
• Confirm no urethral trauma (assess by gentle palpation)
• If urethral injury has occurred, a scrotal urethrostomy may need to be performed at this point

Step 6 - Closure

• Reassess skin tension throughout closure and again with the patient undraped at the end
• The final closure should leave a small ridge of tissue (not a perfectly flat surface) - this is intentional to accommodate post-surgical swelling and improve comfort

Healed incision site showing the typical linear closure at 2 weeks post-op

Step 7 - Compression Bandage (Optional but Recommended)

• Place a small piece of sterile gauze directly over the surgical site
• Wrap with self-adhesive bandage material (e.g., VetRap/Coban)
• This scrotal wrap:
  • Applies compression to reduce drainage
  • Allows quantification of any post-op drainage
  • Provides hemostasis of scrotal vasculature
  • Prevents environmental contamination and self-trauma

Post-Operative Care

Immediate (0-24 hours)

• Monitor recovery from anesthesia closely
• Pain management is essential:
  • NSAIDs (meloxicam, carprofen, grapiprant)
  • Opioids as needed (buprenorphine patch or oral transmucosal)
• A small amount of serosanguinous drainage is expected for the first few hours
• Apply cold packs (wrapped in a towel) for 10-15 min every 4-6 hours to reduce swelling

Short-term (Days 1-14)

• Elizabethan collar (E-collar) mandatory - prevent licking/chewing at incision
• Strict exercise restriction for 10-14 days (leash walks only)
• Keep incision clean and dry - no bathing
• Check incision daily for: redness, swelling, discharge, dehiscence, odor
• Antibiotics: indicated if surgery was for infected tissue; not routinely needed for clean elective cases
• Recheck at 14 days for suture removal (if external sutures used) and wound assessment

Warning Signs Requiring Immediate Attention

• Excessive bleeding or rapidly expanding hematoma
• Purulent discharge or strong odor
• Complete wound dehiscence
• Signs of urethral injury: straining to urinate, dysuria, urine pooling

Complications

Comparison: Standard Castration vs. Scrotal Ablation

Special Considerations

• Cryptorchid dogs: If retained testes are present, the approach changes (inguinal or abdominal approach for the retained testis), but scrotal ablation may still be performed for the descended testis and pendulous scrotal tissue
• Scrotal neoplasia: Wide surgical margins are needed; FNA or incisional biopsy should ideally precede surgery; histopathology of excised tissue is mandatory
• Scrotal urethrostomy: If severe urethral obstruction or damage exists, scrotal ablation may be combined with a permanent scrotal urethrostomy to create a new urethral opening at the perineum
• Older intact dogs: These are the most commonly indicated patients - large pendulous scrotum in older dogs almost always warrants ablation at the time of late-in-life neutering

Key Surgical Pearls

1. Plan your incision margins before draping - use a surgical marker
2. Always protect the urethra - it is immediately beneath the scrotal tissue
3. Leave adequate skin for tension-free closure - err conservative
4. Electrocautery is your best friend for scrotal hemostasis (very vascular tissue)
5. Compression wraps significantly reduce post-op seroma/hematoma in large dogs
6. Intradermal closure reduces self-trauma compared to external skin sutures
7. Submit all excised tissue for histopathology - scrotal neoplasms are common and unexpected
8. Reassess tension with patient undraped before final skin closure