Alexis Ohanian, tennis legend Serena Williams' husband, detailed a recent health scare in a post on Instagram ... in which he says he got half his thyroid removed.
The Reddit cofounder and entrepreneur explained it all in a post put up on Thanksgiving day ... showing a snap of him with a scar on his neck while gowned up in a hospital bed -- saying the procedure came after "tracking some suspicious nodules on my thyroid for the last 4 years.