Avian Oncology

Question 1

What is a teratoma?

How are they classified histologically?

Where do they occur most often in birds?

Answer 1

• neoplasm that originates in germ cells and is formed by the inclusion of cells or tissues from two or more embryonic layers, endoderm, mesoderm, and ectoderm
• classified histologically - mature vs immature
  
  • mature - well-differentiated tissues, typically benign
  • immature - poorly differentiated tissues, may be malignant
• originate mainly from gonadal tissues - in the coelomic cavity
  
  • may originate from ovary, Meckel’s diverticulum, kidneys, or adrenal gland

JZWM 48(2) : 559-562. 2017. COELOMIC TERATOMA IN A BLUE-AND-YELLOW MACAW (ARA ARARAUNA)