TOP-SECRET medical drama unfolding on  Bravo’s wildly popular “The Real Housewives of Atlanta” – and only The ENQUIRER has the inside scoop! SPOILER ALERT!

While the “RHOA” cast and crew aren’t spilling about the medical scare, we can reveal all the details – who it is, what it is and how dangerous the situation could be!

So if you don’t want to know before the show airs, stop reading NOW!

Rumors started swirling last month that gorgeous model Cynthia Bailey, 46 – who married restaurateur Peter Thomas in 2010 – might be pregnant, because she appeared to be sporting a paunch at BFF NeNe Leakes’ wedding. The whispers prompted Cynthia to reveal publicly that she had an undisclosed medical condition,” said an insider.

The ENQUIRER has learned Cynthia has uterine fibroid tumors that have grown so large they need to be surgically removed ASAP.

According to WEBMD, fibroid tumors are composed of renegade muscle cells that band together to form a fibrous mass within the uterus. Like Cynthia’s, they are rarely malignant, but commonly occur between the ages of 30-40, with African-American women at greatest risk.

“Cynthia agreed to share her health crisis on the show because she wants other women see what she goes through and be reminded that they need to get regular checkups,” a family friend revealed.

“She didn’t go to the doctor because she was working too much. But when her stomach started to grow, and she knew she wasn’t pregnant, she went to the doctor in a panic, wondering if she had cancer.”

Although the diagnosis came as a relief, Cynthia, who has a 12-year-old daughter from a previous relationship, is still concerned about surgery.

“She’s allowing Bravo cameras to be there,” added the friend. “And Peter will be right by her side.”