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A parathyroid adenoma is a benign tumor of the parathyroid gland. It generally causes hyperparathyroidism; there are very few reports of parathyroid adenomas that were not associated with hyperparathyroidism. [1] A human being usually has four parathyroid glands located on the posterior surface of the thyroid in the neck.
The majority of cases of hyperthyroidism in cats are the result of benign tumours. The most commonly identified abnormalities of the thyroid gland in hyperthyroid cases are follicular cell adenoma and multinodular adenomatous hyperplasia. 1% to 3% of feline hyperthyroid cases are caused by malignant tumours.
In the vast majority of cats with hypersomatropism, it is caused by an adenoma of the somatotrophic cells. Said adenoma is typically visible by the time a cat presents with symptoms; however if pituitary imaging is performed during the early stages of the disease, it may still be small and difficult to recognise.
Other symptoms may include bone pain, weakness, depression, confusion, and increased urination. [1] [2] Both primary and secondary may result in osteoporosis (weakening of the bones). [2] [3] In 80% of cases, primary hyperparathyroidism is due to a single benign tumor known as a parathyroid adenoma.
The most common cause of primary hyperparathyroidism is a sporadic, single parathyroid adenoma [5] resulting from a clonal mutation (~97%). Less common are parathyroid hyperplasia [6] (~2.5%), parathyroid carcinoma (malignant tumor), and adenomas in more than one gland (together ~0.5%).Primary hyperparathyroidism is also a feature of several familial endocrine disorders: Multiple endocrine ...
The disease has become significantly more common since the first reports of feline hyperthyroidism in the 1970s. The most common cause of hyperthyroidism in cats is the presence of benign tumors called adenomas. 98% of cases are caused by the presence of an adenoma, [64] but the reason these cats develop such tumors continues to be studied.
Lentigo in cats is a common dermatological condition characterized by the presence of small, flat, brownish spots on the skin — particularly around the lips, nose, and eyelid margins. Unlike in ...
Thyroid follicular adenoma ranges in diameter from 3 cm on an average, but sometimes is larger (up to 10 cm) or smaller. The typical thyroid adenoma is solitary, spherical and encapsulated lesion that is well demarcated from the surrounding parenchyma. The color ranges from gray-white to red-brown, depending upon the cellularity of the adenoma