The most common areas affected were the ribs (in 12 patients),(12, 14, 15, 19, 21, 22, 24, 29, 30, 36, 37) the pelvis (in 8 patients),(15, 21, 22, 23, 24, 26, 29, 39) and the femur(11, 15, 24, 26, 28) and the feet (in 5 patients each).(15, 24, 26, 29, 30) Bone biopsy was performed in 4 cases(13, 20, 24, 28) and showed osteomalacia in 3.(13, 24, 28) Six patients underwent PET‐FDG(15, 19, 20, 23, 24, 34) and 2 octreotide(28, 34) scans looking for tumors as a source of FGF23 but all were negative. This evidence concerns the gene FGF23 and osteomalacia.