Three encapsulated tumors found at the base of the heart of the dog were classified as ectopic thyroid adenomas. The ultrastructural characteristics of normal thyroid follicular epithelium were seen: dense secretory-type granules, cell polarity with apical microvilli, and well-developed endoplasmic reticulum. Long, dense tubules were present within the cisternae of smooth endoplasmic reticulum of neoplastic cells; they were not seen in other tissues. These characteristics distinguish ectopic thyroid tumors from aortic body tumors.
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