Photomicrographs from a sandhill crane found dead in Indiana U.S.A.

Photomicrographs from a sandhill crane (Antigone canadensis) found dead in Indiana, U.S.A.  (A) The mass is composed of islands of well-differentiated chondrocytes separated by fibrovascular connective tissue. There is minimal cellular pleomorphism and no mitotic figures are seen (inset). H&E stain.  (B) Multifocally, islands of chondrocytes are hypereosinophilic with loss of nuclear detail (necrosis; asterisk) and surrounded by epithelioid macrophages (arrow).  H&E stain.