Bodies Built Backward: Situs Inversus  Nine-year-old Kay Salomon
is the picture of health. She enjoys many activities like
skateboarding, surfing and swimming.  "I am kind of a big
athlete," she says.  But Kay's mother, Kerry McAuley, lives in
constant fear. This fear isn't just the worry of a normal
parent, and McAuley's not just afraid that Kay will get hurt.
She's constantly worried that Kay might die.  "I go in there
many times during the night and check on her and make sure she's
okay, wondering if this is the year or is it going to be in six
months… when is she going to get sick on me?" says McAuley.
"Because it could happen … it might not happen, but nobody
knows."  Watch the story on "Primetime: Medical Mysteries"
Wednesday at 10 p.m. ET, and go to during the show to solve a
real medical mystery.  Reversed Organs  To understand McAuley's
concerns, you have to understand what's happening inside her
daughter. And we're not talking about getting inside Kay's head
or understanding her feelings. We mean li