Fox News Flash top entertainment and celebrity headlines are here. Jamie-Lynn Sigler detailed her 10-year-old son's "nightmare" ICU visit that led to an autoimmune disorder diagnosis. According to the TV star, her son has been diagnosed with acute disseminated encephalomyelitis (ADEM).

"4 weeks ago, what seemed like a normal virus for our son, turned into a nightmare," Sigler shared Tuesday on Instagram. "Beau has what we believe to be, ADEM. To say this has been hard, is an understatement, and I’ve never felt more broken.

.." A post shared by Jamie Lynn Sigler (@jamielynnsigler) APP USERS CLICK HERE TO VIEW THE INSTAGRAM POST ADEM is a very rare, neurological immune response that sometimes kids can get after contracting a simple virus.

"They compared it to getting struck by lightning," Sigler explained in an episode of " MeSsy with Christina Applegate & Jamie-Lynn Sigler ," emphasizing how rare the condition is. ‘SOPRANOS’ STAR JAMIE-LYNN SIGLER REVEALS HOW MS PREVENTS HER FROM GIVING HER KIDS ‘ALL THEY WANT’ Jamie-Lynn Sigler's son was hospitalized with an autoimmune disorder. (Jamie-Lynn Sigler/Getty Images) Her 10-year-old son had not been feeling well in the days leading up to the diagnosis.

At one point, Beau had a 105-degree fever, and Sigler's husband rushed him to the hospital as he screamed his head hurt. Sigler's son went to the ER three separate times over the next days, only to be sent home after tests were run. After landing an appointment with an infec.