New Technique for Chiasmapexy Using Iliac Crest Bone Graft: 2 Cases of Visual Impairment Caused by Empty Sella Syndrome

摘要

Background Chiasmapexy is used to treat empty sella syndrome, and various materials are used for the elevation of the optic chiasm. However, the use of artificial substances may have the risk of graft infection, and fat and muscle may be absorbed over the long term after surgery. In addition, bone and cartilage may be unavailable in adequate amounts. Here, we describe a new technique for chiasmapexy using an iliac crest bone graft. Case Description The first patient was a 71-year-old woman who had undergone transsphenoidal surgery twice for the treatment of pituitary adenoma and Rathke cleft cyst. The optic chiasm collapsed after the second surgery and her visual field worsened gradually. We performed chiasmapexy using fat, fascia, and a septal mucosal flap, but the optic chiasm did not remain in the normal position because of graft shrinkage. Finally, we used an iliac crest bone graft, which resulted in good visual function. The second patient was a 58-year-old man who was incidentally diagnosed with empty sella syndrome. The patient's bitemporal hemianopia gradually progressed. As in the first case, we used an iliac crest bone graft, which halted the deterioration of visual function after chiasmapexy. Conclusions The advantages of iliac bone are that it is less likely to absorb and become infected than synthetic materials. This method may be suitable for reoperative cases, especially those wherein the septal cartilage has been removed in a previous surgery. This method will halt visual deterioration and may be one of the considerable options for chiasmapexy operations.