Primary hyperparathyroidism caused by bilateral parathyroid cystic carcinoma in a cat

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Virtanen , J K , Mölsä , S H , Hagner , K A , Salonen , H M & Kilpinen , S 2020 , ' Primary hyperparathyroidism caused by bilateral parathyroid cystic carcinoma in a cat ' , Journal of Feline Medicine and Surgery Open Reports , vol. 6 , no. 2 . https://doi.org/10.1177/2055116920976544

Title: Primary hyperparathyroidism caused by bilateral parathyroid cystic carcinoma in a cat
Author: Virtanen, Juulia K.; Mölsä, Sari H.; Hagner, Karoliina A.; Salonen, Hanna M.; Kilpinen, Susanne
Contributor: University of Helsinki, Small Animal Hospital
University of Helsinki, Equine and Small Animal Medicine
University of Helsinki, Veterinary Biosciences
University of Helsinki, Diagnostic imaging
University of Helsinki, Equine and Small Animal Medicine
Date: 2020-12-16
Language: eng
Number of pages: 6
Belongs to series: Journal of Feline Medicine and Surgery Open Reports
ISSN: 2055-1169
URI: http://hdl.handle.net/10138/325655
Abstract: Abstract Case summary A 16-year-old neutered female Korat cat presented with chronic vomiting, mild azotaemia and mild hypercalcaemia. Physical examination revealed bilateral palpable masses on each side of the trachea. Laboratory results were consistent with primary hyperparathyroidism, diagnostic imaging findings with cystic thyroid or parathyroid masses, and fine-needle aspiration cytology with thyroid hyperplasia or adenoma. In order to confirm whether one or two of the masses were the cause of the hyperparathyroidism, cystic fluid was aspirated from both for parathyroid hormone concentration measurement. The concentration was shown to exceed that of the serum manyfold in both samples, confirming both masses to be functional and of parathyroid origin. A total parathyroidectomy and thyroidectomy were performed on the right side, and a subtotal thyroidectomy and a subtotal to total parathyroidectomy on the left, without any major postoperative complications. Histopathology was consistent with bilateral parathyroid carcinoma. Relevance and novel information To our knowledge, this report is the first to describe a rare case of bilateral parathyroid cystic carcinoma in a cat. It highlights the usefulness of determining parathyroid hormone concentration in the cystic fluid of a suspected neoplastic parathyroid mass preoperatively. It also demonstrates that it may be possible to remove most of the cervical parathyroid and thyroid tissue of a cat without causing any clinically relevant hypocalcaemia or iatrogenic hypothyroidism. However, serum concentrations of ionised calcium, thyroxine and creatinine should be closely monitored in the postoperative period in order to detect and control possible complications.
Subject: 413 Veterinary science
hypercalcaemia
parathyroid neoplasm
parathyroid hormone
cervical mass
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