Histologic margin involvement by cutaneous basal cell carcinoma stroma: a retrospective cohort study for residual or recurrent carcinoma

Stromal margin involvement in non-superficial BCCs is rarely associated with residual or recurrent carcinoma. Adverse outcomes were confined to tumors containing a superficial component, highlighting biologic heterogeneity among BCC subtypes. These findings suggest that routine re-excision may be unnecessary for stromal-margin-positive BCCs lacking a superficial component and support more selective, subtype-informed management.