Table 2.
High risk behavior cSCC | |
Bowen's disease with invasion | |
Adenosquamous carcinoma | |
cSCC in proliferating pilar tumor/cysts | |
Tricholemmal cysts | |
Epidermoid cysts | |
Desmoplastic cSCC | |
De novo cSCC | |
cSCC in chronic conditions | |
Ulcers, sinus tracts, burns | |
Osteomyelitis | |
Chronic inflammatory disorders | |
Radiation-induced cSCC | |
Indeterminate risk cSCC | |
Clear cell SCC | |
Signet ring cell | |
Papillary cSCC | |
Pigmented cSCC | |
Follicular cSCC | |
cSCC from benign adnexal cyst | |
Putative cSCC versus low grade cSCC | |
Keratoacanthoma (KA) | |
Not a bona fide cSCC | |
Low grade behavior | |
Giant KA, | |
Subungual KA | |
KA with Immunosuppression |
*Modified Classification system from Cassarino et al. [24].