To promote understanding and improve diagnostic level of Rathke′s cysts with CT and MRI,crosscheck analysis was performed between CT,MRI and operative pathology was done in 6 cases.Results: It was misdiagnosed as cranio pharyngioma,hypophysoma and cholesteatoma in CT and MRI before operation.Oval and irregular cystic low density was showed in CT in 4,oval iso density and higher density in 1,respectively,and line like reinforcement of the cystal wall in 2 after intensification.Oval and oval like low signals were showed in 3 and isosignals in 1 on T 1 weighted images of MRI and high signals with clear edge on T 2 weighted images.It suggested that the diagnostic value of MRI was superior to that of CT in Rathke′s cysts.

Objective To observe the survival,conversion and function preservation of mesenchymal stem cells(MSC) after transplantation.Methods MSCs from male Sprague-Dawley(SD) rats were isolated and cultured,then were transplanted to bone defect of female SD rats.Tissues were obtained at defferent periolds.Hybridization in situ was performed on the tissues using Y chromosome specific DNA probe labeled with digoxin to observe the transplanted cells on distribution,quantity and function.Results Allogeneic MSCs could survive and proliferate in the bone defect of recipients and formed bony callus with large quantity and good quality.After 90 days of graft,stem cells still survived and distributed in marrow and newly formed bone tissue.Conclusion After transplantation,allogeneic MSCs have a long-term surviving in marrow and new bone tissue and maintain the characteristic of ossification.