Objective To explore CT features of simple renal adipose capsule herniation (SRACH)and discuss its classification. Methods CT data of 1 8 patients with SRACH were retrospectively analyzed.Results All of the 1 8 cases occurred on the left side. SRACH could be divided into two types,thoracic and extrapleural.XGray films were negative in 1 7 cases,and 1 case in the lateral chest radiograph showed the hilly shadow in the posterior costal phrenic area.The results of CT detections presented as round,oval,and fusiform fat density masses on the paraspinal or posterior phrenic angle area with smooth margins,which extended downward to the diaphragm and were linked to the perinephric fat.Conclusion MSCT can clearly show the location of SRACH,the shape,size and density of the hernia sac,and the relationship with the renal adipose capsule,which may be helpful in confirming the diagnosis.

OBJECTIVETo study the effect of radiotherapy of nasopharyngeal carcinoma on visual evoked potential (VEP).

METHODSVEP of 63 patients with nasopharyngeal carcinoma were tested before, at the end of, half a year, one year, 2 years and 3 years after their radiotherapy.

RESULTSWithin the male group, one year after radiotherapy, the latency of VEP was significantly delayed than that before and at the end of radiotherapy, while the amplitude was decreased significantly. Two years after radiotherapy, the latency of VEP was significantly delayed more than that before radiotherapy. However there was no significant difference among VEP at the end of, half a year and 3 years after radiotherapy. Within the female group, 2 years after radiotherapy, the latency of VEP was significantly delayed than that before radiotherapy. Three years after radiotherapy, the latency of VEP was significantly delayed than that before, at the end of, half a year and one year after radiotherapy. There was no significant difference in VEP amplitudes before and after radiotherapy.

CONCLUSIONWithin the male group, the abnormal delay of VEP latency mostly happens one or two years after radiotherapy. Within the female group, the significant delay of VEP latency happens at the end of radiotherapy and lasts for 3 years, while the VEP amplitude does not change significantly during the 3 years after radiotherapy. The result indicates that the sustained radiation damage within the female visual nerve system starts at the end of radiotherapy, but to a lesser degree. It was shown that radiotherapy of nasopharyngeal carcinoma certainly damages the visual nerve system, though there is sex difference in the impairment.

Adult ; Evoked Potentials, Visual ; radiation effects ; Female ; Humans ; Male ; Middle Aged ; Nasopharyngeal Neoplasms ; radiotherapy ; Sex Factors ; Time Factors