Guy: in some countries, aerodromes have their own radar approach control rather than having several aerodromes covered by a terminal control.
Malecontrol:
How about 'losing radar contact, terminating radar service'.
When the return re-appears, re-identify by either asking to squawk ident or assigning a discrete transponder code in which case 'ident' is not required. In both cases, the pilot must be informed he is identified and the type of ATS being provided must be agreed between pilot and controller.