Received my report back from the state lab today. It was Merrick’s disease. Here is the summation:
The body of an 8-month-old, female Wyandotte chicken is submitted for standard necropsy on December 27, 2018. The hen is in excellent body condition score with abundant subcutaneous and visceral adipose tissue. Autolysis is moderate.
There is multifocal to confluent effacement of the myocardium, lungs, liver, ovary, and right sciatic nerve by variably sized, firm, white to tan masses. The spleen is diffusely, mildly enlarged. The left sciatic nerve is diffusely, mildly enlarged. All other tissues and organs examined are grossly within normal limits.
Multiple tissues: lymphoma.