In an otherwise well 15 year old, what is the most likely diagnosis?
Langerhans cell histiocytosis (eosinophilic granuloma).
Typically, what is the description given to the margins of the lucency, and why?
Double contour or bevelled edge appearance may be seen. Greater involvement of the outer than the inner table.
A well defined lytic lesion is seen in the parietal bone on the right with bevelled edges. It involves both the inner and outer table, although the outer table is affected more than the inner table.