High risk basal cell carcinomas
Size >2 cm diameter
Location in high risk anatomical areas (centrofacial, periocular, “H zone,” and embryological fusion zones of face)
Poorly defined edges
Morphoeic, infiltrative, or aggressive histological subtypes
Perineural or perivascular invasion
Recurrent or previously incompletely excised basal cell carcinoma
Host factors (immunosuppression, especially if organ transplant recipient)
Facial basal cell carcinoma
BMJ 2012; 345 d