We present below a case of a 37 year old man with SCC of the left forefoot, which spread through a natural plane of weakness
in the dermal-epidermal junction as a complication of the congenital weakness in the area resulting from EB.
That, combined with the geometric notch at the root of the head, creates a plane of weakness
in the rivet.
Mica, calcite, clay, and fossils tend to be deposited more or less on surfaces parallel to the bedding planes and laminations and form a plane of weakness
along which rock strata can easily separate.
The first break occurred in a crystallographic plane of weakness
close to the point of attachment.