Does this sound like Marek's?

[Sue Gremlin]

My black sex link hen (4 years old) has had a pendulous crop for a couple of years now. She seems fine otherwise. Her crop has been getting larger lately, making me think it's not just her crop but possibly a mass in there.

Now she has a weird hitch in her gait. It started with one leg, she would pick it up twice before taking a step. Now she does it with both legs. She does a weird bicycle thing with her foot every step, just one hitch per step. Sometimes she walks normally, but she mostly does this. It seems neurological to me, I can't find anything amiss with her legs otherwise.

She is bright, alert, eating, drinking and roosting ok, and is in good weight. Her eyes are a normal color. She keeps up with her girlfriends when they're out in the yard. I plan to put her down if any of this changes and I feel she's not feeling right.

Has anyone had their chicken do this weird step thing? I tried to get her on video, but of course, she wouldn't do it for the camera.

 

[ChickenCanoe]

Doesn't sound like it to me.

There are many forms.
https://www.backyardchickens.com/a/mareks-disease-fact-site

 

[Sue Gremlin]

I finally managed to get some video of my girl's weird gait. You can also see how big this mass is (or her crop).
She does the hitch thing with both legs, but one is much worse than the other. We went out of town for the holiday, and I can see that her problem is getting progressively worse. This stumbling she does is new, and she has trouble keeping up with her flock mates. I think her time is near.