[What is the significance of the phenomenon of hypertension in disguise in patients with type 2 diabetes mellitus treated for long-lasting hypertension?]. 
"Hypertension in disguise" is quite frequent in the patients with diabetes mellitus.  It leads to organ damage similarly as persistent hypertension and it is associated with an increased cardiovascular risk which can be reduced through effective treatment.  Persistent hypertension is present in 70% of the patients with type 2 diabetes mellitus.  During its treatment, the picture of "masked hypertension" may be imitated (normalized blood pressure taken at a day clinic, as opposed to the increased values outside of it).  This finding occurs in 35-60 % of the patients with type 2 diabetes mellitus and it is associated with the significance of changes to internal organs.  The importance of this finding has been under discussion.