[Aseptic osteonecrosis of the femur head and pregnancy. Apropos of 2 cases with MRI study].

Two further cases of aseptic osteonecrosis of femoral head during pregnancy are reported, and the literature reviewed of this rare etiology of debatable etiopathogenicity. The value of MR imaging is demonstrated both for early positive diagnosis and for the differential diagnosis from decalcifying algodystrophy.