Executive producer Zoanne Clack talks us through some of the show’s most bizarre maladies.

If it’s rare and even ridiculous, the staff at Grey Sloan have treated it.

“We’re the 1 percent hospital,” jokes executive producer and emergency medicine residentZoanne Clack.

ELLEN POMPEO, KELLY MCCREARY

Ron Tom/ABC

“Fitting rare medical cases into the characters' stories is a total puzzle.”

Or we’ll make something up and then check that that it works with experts."

A lot of people will swallow paperclips and kniveswhich we did later with [an incarcerated woman].

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

Sothat’s what we came up withbecause it would be such a funny-looking X-ray."

“We also wanted to introduce the pain-management story line, withDerekbeing the doctor who dealt with it.

So we just pushed them together and had that happen.

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

We had two of our married writers be our models to make it less awkward.

There was a lot of modeling that went along with that.

It was fun to figure out.”

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

This one was one of the ones where my initial thought was, ‘Are you kidding me?

We can’t do this!’

But then I realized that a teratoma puts out the hormones that you make during pregnancy.

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

We tried to get it in a couple of episodes before it actually landed.

Making her this fearless person definitely helped with what was going on in the episode, story-arc-wise."

“It was also all about us wanting to use a bunch of surgeons all at once.

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

“It happens; the fish will follow the stream of urine into the penis.

We finally accomplished it!

It was in so many episodes before the one it ended up in, it was hilarious.”

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

“That was one that actually took a long time to research because it doesn’t really happen.

The main point of that was to get all of our characters together.

We actually use it as a framework for cases that we do now when we need everyone together.

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

“It was based on a real case.

It was really interesting because I really didn’t even understand how warts turn into that.

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC

Grey’s Anatomy screen grabWeirdest Medical CasesCredit: ABC

ABC