<prompt> Diagnose the condition in the given x -rayColies fractureMonteggia fractureGaleazzi fractureGun stock fracture  <response>: Ans. is b i.e., Monteggia fracture This is the fracture of upper third of ulna with dislocation of the radial head. It is usually called tracherous lesion because the dislocation is often missed - monteggia fracture. 