We report a case of asymptomatic right diaphragm agenesis, in a 20-yea
r-old adult hospitalized for internal bleeding. This kind of malformat
ion is rare, particularly in adults thus it must be recognized. Imagin
g modalities are the main tool for diagnosis. It may be suggested by c
hest X-Ray US, baryum opacification and CT allow to establish a defini
te diagnosis depicting the herniated organs. The treatment is surgical
and the prognosis is in general good.