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Vet Pathol 40:698-703 (2003)
© 2003 American College of Veterinary Pathologists
BRIEF COMMUNICATIONS AND CASE REPORTS

Adenomatous Hyperplasia of the Thyroid Gland in Beluga Whales (Delphinapterus leucas) from the St. Lawrence Estuary and Hudson Bay, Quebec, Canada

I. Mikaelian, P. Labelle, M. Kopal, S. De Guise and D. Martineau

The Jackson Laboratory (IM), Bar Harbor, ME; the Canadian Cooperative Wildlife Health Centre (PL, MK, DM), Saint-Hyacinthe, Quebec, Canada; and Department of Pathobiology and Veterinary Sciences (SDG), University of Connecticut, Storrs, CT

Abstract

We evaluated thyroid gland lesions in beluga whales (Delphinapterus leucas) from the St. Lawrence Estuary (n = 16) and Hudson Bay (n = 14). Follicular cysts and nodules of adenomatous hyperplasia of the thyroid gland were found in eight and nine adults from the St. Lawrence Estuary (n = 10), respectively, and in four and six adults from Hudson Bay (n = 14), respectively. The total volume of the lesions of thyroid adenomatous hyperplasia was positively correlated with age in both populations. Comparison between populations could not be performed because of differences in age structures of sample groups. Beluga whales from both populations have unique thyroid lesions among marine mammals.

Key words: Adenoma; beluga; environmental pathology; hyperplasia; polychlorinated biphenyls; thyroid; tumor; whale.

Request reprints from Dr. Igor Mikaelian, #98, The Jackson Laboratory, Bar Harbor, ME 04609-1500 (USA). E-mail: imikaeli{at}jax.org.




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