43 
lies in a similar position on the left side. They 
are identified as thyroid glands only from their 
position and from the numerous large vessels 
which radiate from them. An unusually large 
vessel leads directly to the heart. The long axes 
extend anteroposteriorly. The masses are of a 
firm, gelatinous consistency, the color of carpen- 
ter's glue in the lower portions, shading off to a 
dirty canary yellow above. They have a trans- 
lucent appearance in the lower portions. The 
surface is fairly smooth, adherent laterally and 
posteriorly. They are well circumscribed. 
Under the microscope, thyroid tissue is easily iden- 
tified at one end of section. It varies from nor- 
mal in that its spaces are often very large, contain 
villus projections or may be completely filled by 
large compound granule cells with no colloid. 
Other aoini are atypical and contain typical col- 
loid. Continuous to such thyroid tissue is a very 
large, rounded tumor. It consists of round cells 
with round nuclei in which many mitotic figures 
may be seen. An arrangement into acini cannot 
be made out, nor is colloid material abundant. 
In one or two places an irregular collection of such 
material may be seen, with peripheral vacuoliza- 
tion, but its confines are always indefinite. As 
far as section goes the mass is well encapsulated, 
but the lymphatics are infiltrated by tumor cells. 
The tumor, too, is sharply separated from the 
relatively normal thyroid. Irregularly scattered 
through the section are remarkable cells, with 
nuclei three or four times the size of other nuclei. 
They may be hyperchromatic. 
2718. Raccoon-like Dog {Canis procyonoides) : 
Adenocarcinoma sarcomatosum of thyroid. 
At level of thyroid cartilage on each side and re- 
moved 1 cm. from same is a rounded, encapsu- 
lated nodule, measuring 2.5 x 2 x 1 cm. Portions 
