Cryotherapy - Comprehensive Overview

Definition & History

Cryogens Used

Mechanism of Tissue Destruction

1. Ice crystal formation - Rapid freezing causes intracellular ice crystals, which are far more destructive than the extracellular crystals formed during slow freezing. Crystal expansion physically ruptures cell membranes.
2. Electrolyte imbalance - As water freezes, solute concentrations in non-frozen fluid rise dramatically, creating osmotic injury to adjacent cells.
3. Recrystallization - During thaw, ice crystals coalesce and expand further, amplifying mechanical damage.
4. Vascular stasis and ischemia - Freeze-induced endothelial injury causes microvascular thrombosis, cutting off nutrient blood supply to the treated tissue.
5. Multiple freeze-thaw cycles - Repeating the cycle compounds all four mechanisms and significantly increases cell kill.

• Benign lesions: -20°C to -30°C is sufficient
• Malignant lesions: require -40°C to -50°C
• Target temperature of approximately -50°C (monitored by thermocouple) is recommended for basal cell carcinomas
• Andrews' Diseases of the Skin, p. 1024; Textbook of Family Medicine 9e

Clinical Applications

Dermatology (most common use)

• Verrucae (warts) - most common indication
• Seborrheic keratoses
• Molluscum contagiosum
• Acrochordons (skin tags)
• Condylomata acuminata
• Papular nevi
• Granulation tissue

• Actinic keratoses

• Selected basal cell carcinomas (BCCs) - superficial and nodular types; recurrence <10% for primary small BCC. Standard excision remains preferred for higher cure rates and better cosmesis
• Selected squamous cell carcinomas

• Effective in 65-75% of cases. A 10-15 second freeze with LN2 or 30-45 second freeze with N2O is typical. Critically, cryotherapy can pre-soften keloids before intralesional steroid injection, allowing better steroid dispersal and lower injection pressure
• Limit freeze time to avoid persistent post-treatment hypopigmentation

• Effective for pustular/superficial cystic acne, not comedonal/papular; largely fallen out of use in modern dermatology
• Pfenninger and Fowler's Procedures for Primary Care; Textbook of Family Medicine 9e

Gastroenterology / Endoscopy

• Barrett's esophagus (BE) with dysplasia - After an average of 4 treatments, 97% resolution of high-grade dysplasia (HGD), 87% resolution of intestinal dysplasia, 57% resolution of intestinal metaplasia. At 5-year follow-up: 93% resolution of HGD, 75% resolution of intestinal metaplasia. Complication rate 0-3%; most common complication is pain requiring narcotics (10%), followed by stricture requiring dilation (up to 9%). Can be used as first-line or as salvage therapy after other modalities fail.
• Gastrointestinal tract lesions - an updated 2024 review (PMID 38662539) covers expanding endoscopic applications
• Current Surgical Therapy 14e

Urology / Oncology

• Renal cell carcinoma - Cryotherapy (and radiofrequency ablation) are used for small renal masses. Guidelines do not recommend cryotherapy for tumors >3 cm. Relative contraindications include hilar/central location and cystic tumors
• Prostate cancer - Cryotherapy is a recognized option for localized disease (see Campbell-Walsh-Wein Urology)
• Hepatic tumors - Used in select cases of liver metastases

Gynecology

• Cervical intraepithelial neoplasia (CIN) - Cryotherapy with flat cervical probe tips is a standard outpatient treatment for CIN

Pulmonology

• Endobronchial cryotherapy is used for airway lesions and foreign body removal (see Murray & Nadel's Textbook of Respiratory Medicine)

Orthopaedics / Sports Medicine

• Accelerates muscle recovery by an estimated 30-40% and reduces serum creatine kinase
• Used for pain relief in osteoarthritis and rheumatoid arthritis - a 2025 comprehensive review (PMID 41466979) covers thermotherapy vs. cryotherapy in inflammatory arthritis
• A 2024 orthopedics review (PMID 38630298) summarizes current WBC concepts

Techniques of Application

• Unit held 1-2 cm above lesion; spray at 90 degrees aimed at center
• Freeze until a 1-2 mm halo of normal tissue is involved; monitor thaw time (1.5-2 min complete thaw for keloids)
• 2-3 freeze-thaw cycles per session increase efficacy
• Never reintroduce cotton-tipped applicators to the LN2 container (viral survival risk)

Advantages

• No local anesthesia required in most cases
• Minimal scarring (collagen-sparing mechanism)
• Quick, low-cost, office-based
• No blood-borne pathogen exposure
• Treats multiple lesions in one visit
• Suitable for elderly and patients who cannot tolerate surgery

Disadvantages & Contraindications

• No tissue specimen for histopathology
• Hypopigmentation risk - especially in darker skin tones (melanocytes are destroyed even with brief freezing)
• Avoids hair-bearing areas (destroys hair follicles)
• Healed cryolesions may not tan; increased sun sensitivity

• Known cryotherapy sensitivity
• Melanoma
• Invasive skin cancer requiring tissue diagnosis
• Vascular compromise to the area
• Expected poor wound healing
• Steroid-dependent immunosuppression

• Hepatitis B/C, mononucleosis, leukemia, lymphoma, myeloma, SLE, nephrotic/nephritic syndrome, macroglobulinemia, rheumatoid arthritis

• Nasolabial fold, periauricular area (BCC tends to be more extensive)
• Vermillion border, periorbital area
• Areas overlying cutaneous nerves

Side Effects & Complications

• Blistering (bulla formation within hours of treatment) - expected
• Crusting, serous discharge
• Pain (burning up to 4 hours post-treatment)
• Hypopigmentation (especially with prolonged freeze)
• 3-4 week healing period
• Scarring (uncommon)
• Stricture formation (endoscopic use, up to 9%)
• Nitrous oxide exposure risk with closed systems - ensure room ventilation

Summary Table by Specialty