In an email to supporters, Preston announced that she will head to Sloan Kettering Cancer Center in New York City next week for surgery.
The County Executive will have the upper lobe of her left lung removed.
After spending the week in New York, Preston is expected to return home for a recovery period.
As she indicated previously, she intends to lead meetings via Skype and remain actively involved in the decision-making process.
Copyright 2016 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.