Collision tumor of Basal cell carcinoma with

Epidermal nevi.

F. Peral Rubio, M.D.Department of DermatologyHospital Universitario Virgen MacarenaSeville, Spain

Collision tumor of Basal cell carcinoma with Epidermal

nevi

A 65-years-old women. The patient was referred to us for

the assessment of a congenital lesion on the back.

The patient has experienced changes 2 years previously.

Collision tumor of Basal cell carcinoma with Epidermal nevi

These are two different lesions:Basal cell carcinomaEpidermal nevi

Collision tumor of Basal cell carcinoma with Epidermal nevi

The dermoscopic features of this pigmented basal cell carcinoma include:

Absence of pigment network Linear and arborising (branch-like)

telangiectasia Leaf-like areas Large blue-grey ovoid nests. Multiple blue-grey globules.

Linear and arborising (branch-like) telangiectasia

Leaf-like areas

Large blue-grey ovoid nests

Multiple blue-grey globules.

Collision tumor of Basal cell carcinoma with Epidermal nevi

An epidermal nevi resembles a seborrhoeic keratosis or viral wart, with fissures, crypts and milia.

Collision tumor of Basal cell carcinoma with Epidermal nevi

The dermoscopic features of this epidermal nevi include:Milia-like cysts Irregular crypts Fissures/ridges

Irregular crypts

Fissures/ridges

Milia-like cysts

Collision tumor

Collision tumor of Basal cell carcinoma with

Epidermal nevi.

F. Peral Rubio, M.D.Department of DermatologyHospital Universitario Virgen MacarenaSeville, Spain