Cerebriform stuctures:

 

These structures look like the surface of the brain and are formed from the ridges and sulci of the surface of a seborrhoeic keratosis.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Moth-eaten borders:

 

As the names suggests, this appears as a ragged border and is classically seen in solar lentigos.

 

 

 

 

 

 

 

 

Lacunes:

 

These are 'lake-like' structures usually seen in vascular lesions. They are homogenous 'blobs' of pigment usually round are represent dilated blood vessels usually found in haemangiomas.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Blue-grey ovoid nests:

 

These are seen as well circumscribed clumps of blue-grey nests and represent histologically clumps of dermal pigmented BCC.