What is saucerization and what are the steps for performing this shallow excision of a cutaneous lesion?

Saucerization: Definition and Technique

Saucerization is a shallow, tangential excision technique that removes cutaneous lesions in a saucer-shaped fashion, creating a concave defect that extends through the full thickness of the lesion while preserving underlying tissue. This method is particularly useful for small, well-defined basal cell carcinomas (BCCs) and squamous cell carcinomas (SCCs) that are not appropriate candidates for Mohs micrographic surgery 1.

What is Saucerization?

Saucerization represents a middle-ground approach between superficial shave biopsy and full elliptical excision. Unlike a superficial shave that only removes the raised portion of a lesion, saucerization extends deeper to capture the full depth of the lesion while creating a curved, bowl-shaped base 2. This technique is especially valuable for flat or pigmented lesions where adequate depth is critical for diagnosis 2, 3.

Key Advantages

• Superior to curettage and electrodesiccation (C&E): Traditional C&E has recurrence rates of 10-20% for skin cancers 1, while saucerization provides more accurate tissue removal with better histologic margin assessment
• More efficient than Mohs surgery: For appropriately selected small lesions, saucerization offers a quicker, less resource-intensive alternative 1
• Preserves tissue: Maintains more normal surrounding tissue compared to wider elliptical excisions
• Allows comprehensive pathologic evaluation: Provides full-thickness specimens necessary for accurate diagnosis, particularly for melanocytic lesions 3

Steps for Performing Saucerization

1. Patient Selection and Lesion Assessment

• Best suited for small (<2 cm), well-defined BCCs and SCCs
• Appropriate for flat or pigmented lesions requiring full-thickness sampling
• Avoid in areas with terminal hair growth (scalp, beard, pubic, axillary regions) where follicular extension may be missed 4
• Not appropriate for high-risk features: poorly defined borders, aggressive histologic subtypes, or recurrent tumors

2. Margin Planning

• Mark a 2-4 mm margin around the visible lesion border
• For pigmented lesions suspected to be melanoma, ensure the entire lesion width is captured to assess symmetry and circumscription 3
• The goal is complete lesion removal with minimal normal tissue sacrifice

3. Anesthesia

• Administer local anesthetic (typically lidocaine with epinephrine) in a field block around the lesion
• Allow adequate time for vasoconstriction (5-10 minutes)

4. Excision Technique

• Use a scalpel blade (typically #15 blade) held at a tangential angle to the skin surface—never use laser or electrocautery as tissue destruction compromises histologic assessment 5
• Begin at the periphery of the marked margin
• Create a smooth, curved, saucer-shaped excision by maintaining consistent blade angle and depth
• The excision should extend through the full thickness of the lesion into the superficial dermis or mid-dermis
• Critical distinction: If you reach subcutaneous fat during the procedure, convert to formal surgical excision as the soft adipose tissue prevents accurate assessment of tumor clearance 4
• Remove the specimen in one piece when possible to maintain tissue architecture

5. Specimen Handling

• Orient the specimen with marker sutures if directional information is important 6
• Place immediately in formalin for fixation
• Document: Patient age, sex, and anatomic site on the pathology requisition—these are mandatory for accurate histopathologic interpretation 5
• Request horizontal (en face) sectioning for comprehensive margin evaluation 1

6. Hemostasis and Wound Management

• Achieve hemostasis with pressure, aluminum chloride, or light electrocautery to the wound base (not the specimen)
• Most saucerization wounds heal well by secondary intention
• Alternatively, consider simple closure if wound edges can be approximated without tension
• Provide wound care instructions for healing by secondary intention if applicable

Critical Pitfalls to Avoid

Tissue destruction: Never use electrocautery, laser, or cryotherapy for the actual excision as this compromises histologic assessment of margins and prognostic factors 5. These modalities prevent accurate determination of Breslow thickness for melanoma or depth of invasion for other malignancies.

Inadequate depth: A superficial shave that doesn't capture the full lesion depth risks misdiagnosis, particularly for melanocytic lesions where maximum thickness is the most important prognostic factor 5. For pigmented lesions, the entire width and depth must be obtained 3.

Wrong lesion selection: High-risk tumors (large size, aggressive histology, poorly defined borders, recurrent disease) require wider margins or Mohs surgery, not saucerization 7, 8.

Reaching subcutaneous fat: If you encounter fat during saucerization, stop and convert to formal excision with appropriate margins 4.

When Saucerization is NOT Appropriate

Based on guideline evidence, complete excision with defined margins is the standard for suspected melanoma 5. For melanocytic lesions thought to be malignant, perform elliptical excision with 2 mm margins, oriented along skin tension lines to facilitate re-excision if needed 5. Saucerization may be acceptable for diagnostic biopsy of pigmented lesions when full excision is not feasible, but complete excision remains preferred 2, 3.

For SCCs, standard excision with 4-6 mm margins is recommended for low-risk tumors 7, 8. High-risk SCCs require wider margins or Mohs surgery 8.