[Is factor XII deficiency a contraindication to surgery?]

The case of an 18-year-old girl with a moderately severe Hageman factor deficiency (Factor XII 2.5%) is described. In this girl, an osteotomy of the pelvis after Chiari was carried out. Both the operation itself and the postoperative healing process were without complications and no signs of any abnormal tendency to haemorrhage were observed. Blood transfusions were not necessary. On the basis of this observation and a review of the literature for the attempt is made to establish general guide lines the procedure to be adopted for surgery in cases of Hageman factor deficiency.