Within recent years there has been considerable clarification of knowledge of lesions in and around the sella turcica, particularly of tumors in this area. The characteristics of intrasellar and suprasellar tumors have been so clearly portrayed that much that was completely obscure has now been effectively clarified. There still remain some lesions about the sella turcica concerning which knowledge is not entirely clear, however. Among them is a group of tumors which arise from the sphenoid ridge, which occupy a position near or beside the sella turcica, and which may therefore be reckoned among the parasellar tumors. It is these which we shall attempt to analyze, with the hope of indicating some characteristics that are common to the group. MATERIAL Strictly speaking, the parasellar tumors include all tumors near or beside the sella turcica. This would include tumors not only in relation to the wings of the sphenoid bones, but