Primary melanoma: pitfalls in diagnostic biopsy techniques and interpretations

Area of Science:

• Dermatology
• Oncology
• Surgical Pathology

Background:

• Melanoma diagnosis relies on accurate assessment of lesion extent.
• Initial biopsy techniques like shave, punch, or incisional may yield insufficient specimens.
• Inadequate biopsy specimens hinder precise microscopic staging of melanoma.

Purpose of the Study:

• To evaluate the impact of initial biopsy technique on melanoma staging and patient outcomes.
• To establish guidelines for managing melanoma cases with insufficient initial biopsy specimens.
• To determine the efficacy of total excisional rebiopsy in improving melanoma management.

Main Methods:

• A 10-year follow-up study of 235 melanoma patients.
• Analysis of 25 cases with insufficient initial biopsy specimens (shave, punch, incisional).
• Implementation of guidelines including clinical evaluation and total excisional rebiopsy when needed.

Main Results:

• Three out of 25 patients with rebiopsied lesions experienced recurrence within 2 years.
• Two patients with recurrence underwent successful re-excision and are disease-free.
• One patient with recurrence died from systemic metastases, highlighting the importance of accurate initial staging.

Conclusions:

• Total excisional biopsy is strongly recommended for suspected melanoma to ensure accurate staging.
• Shave, punch, or incisional biopsy techniques for melanoma should be avoided due to potential for insufficient specimens.
• Prompt rebiopsy and appropriate surgical management are critical for improving melanoma patient outcomes.