ALB and SATB2 associated disorder: The albumin concentrations in both the lumbar SAS and the serum of the patients in this study are similar to those reported in several other studies.36,37 As the albumin concentration normally is much higher in serum than in CSF, the significant difference in albumin concentration between the lumbar SAS and the perioptic SAS in our patients is most likely due to contamination with blood during ONSF.