She doesn't take the file right away, instead, she takes up his under his arm and grabs his free hand. Lydia's never been shy about casual physical contact, and taking his hand is the most natural thing in the world. She tugs him along determinedly to the nearest free exam room, locking the door behind them and turning on the lit exam display so she can pin up both scans and look at them side by side.

It only takes her only a split second for whatever she was straining for to click in her brain. Breathlessly, "Do you see it?"

Because whatever it is, she does.

"Look at your mom's scan and yours side by side. That's impossible."

They're exactly the same.