[The loss of a right muscle in the orbit intra- or postoperatively].

One child four and half years old remains with a divergent deviation by forty-five degree with absence of adduction, after an operation of convergent strabismus at the left eye. Considering that is about by one postoperatorial paralytic strabismus, computer tomography praises the right intern muscle retracted at the back of orbit, but it doesn't adheres at the eyeball. It considers that the divergent strabismus was caused by the slide of postoperatorial muscle. Looking middle line of the muscle, parallel with the middle wall of the orbit, it praises the right intern muscle retracted and after the excision of the granulation tissue all round, displays the muscle with its normal lenght. It cuts 3.5 milimeters from this muscle and it practices the retroposition of the extern right muscle with 7 milimeters. It obtains postoperatorial orthophoria. It talks about possibility of lossen of a right muscle in orbit intra- and post-operatorial and the measures that are imposed in these situations.