Prospective subtyping of head and neck basal cell carcinoma by dermoscopy and handheld RCM.

Summary

In 340 consecutive lesions suspicious for head and neck basal cell carcinoma, combined dermoscopy and handheld reflectance confocal microscopy achieved 97.5% sensitivity and 85.2% specificity. Among lesions with high diagnostic confidence, sensitivity reached 98.8% and specificity 94.1%; biopsy and excisional subtypes were discordant in 33% of cases. The approach may reduce unnecessary biopsies, although its ability to identify infiltrative subtypes remains limited.

Key Findings

• The study included 340 consecutive lesions suspected of being head and neck basal cell carcinoma.
• Combined dermoscopy and handheld reflectance confocal microscopy showed 97.5% sensitivity and 85.2% specificity for basal cell carcinoma diagnosis.
• In high-confidence cases, sensitivity was 98.8% and specificity was 94.1%; biopsy subtypes disagreed with excisional specimens in 33% of cases.

Clinical Implications

Dermoscopy combined with handheld reflectance confocal microscopy may support selected patients undergoing micrographically controlled surgery and could reduce confirmatory biopsies when imaging confidence is high. Histopathology remains important when infiltrative or otherwise high-risk subtypes are suspected.

Limitations

• The study was performed at a single centre, which may limit generalizability.
• Specificity for non-superficial subtypes and sensitivity for infiltrative basal cell carcinoma were limited, so the method cannot replace all biopsies.

Future Directions

Multicentre validation should assess interobserver reproducibility, cost-effectiveness, and outcomes after imaging-guided treatment. Algorithms that improve recognition of infiltrative and other high-risk subtypes are particularly needed.