organ involvement

Hmmmm..
good question....
IMHO, I believe it's considered an organ and if lupus affects organs then it's considered organ involvement.

zulily:

Here is an article that was on the Lupus Foundation website I believe this should answer some of your questions on lupus affecting the thyroid.

http://www.lupus.org/magazine/entry/thyroid-therapy

Hope this helps you out.

Hugs,
Barbara