JAVMA, Vol 219, No. 2, July 15, 2001
Hofmeister E, Kippenes H, Mealey KL, et al.

Possible causes of cystic ventral cervical masses in cats include thyroid, thyroglossal duct, and parathyroid cysts; however, the possibility that such masses represent cystic thyroid adenomas or cystic thyroid carcinomas should also be considered. Magnetic resonance imaging, nuclear scintigraphy,
and measurement of parathyroid hormone concentrations in fluid from ventral cervical cysts may help in differentiating thyroid, thyroglossal, and parathyroid cysts.