Circumstellar masers
  Circumstellar masers are unique tools for probing the envelopes around low mass dying stars using VLBI. In this contribution I briefly review the status of our knowledge on these emissions, especially focusing on the latest results obtained by means of VLBI observations.I also outline some of the new windows that will open for VLBI maser research thanks to the upcoming new instrumentation. 
J. Alcolea (Observatorio Astronomico Nacional, Spain)