A cat was brought to us for the treatment of depression, anorexia, and hypovolemia. We performed an adrenocorticotropic hormone (ACTH) stimulation examination, radiography, ultrasonography, and computed tomography. On the basis of clinical symptoms, a low cortisol level, microcardia, small pulmonary vessels, and small adrenal glands, the condition was diagnosed as hypoadrenocorticism. Imaging findings were useful for obtaining additional information on hypoadrenocorticism. Although hypoadrenocorticism in cats is extremely rare, we would recommend its consideration as a differential diagnosis for cats with nonspecific clinical symptoms and hypovolemia.
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