Purpose of the study
Diaphyseal aneurysmal bone cyst is very rare. We report a case in a 20-year
-old female.
Patient and method
The clinical signs developed rapidly, within one month. The lesion was firs
t curetted and grafted with cortico-cancellous bone. Recurrence was observe
d 6 months later. Complete excision and reconstruction with a free fibular
vascularized grafted enabled healing.
Discussion
The pathogenesis of aneurysmal bone cysts is debated. We hypothesize that i
t is due to the opposed direction of periosteal and medullary blood circula
tion. This could explain the relative rarity of diaphyseal localizations co
mpared with metaphyseal localizations.