A toy -poodle was affected spontaneously with the Cushing syndrome, manifesting systemic alopecia, an increase in abdominal girth, dipsia, polyuria, polyphagia, and a loss of elasticity of the skin. Initial examination revealed leukocytosis, a low ratio of eosinophils to lymphocytes, hyperglycemia, hyperlipemia, high levels of GPT and ALP activity, and large value of plasma hydrocortisone.
In the rapid combined test, the hydrocortisone value was 20.0 and 9.0μg/dl before and 12 hours after loading of dexamethasone, respectively. It was 56.0 and 60.5μg/dl 1 and 2 hours after loading of ACTH. The diagnosis of ACTH-dependent bilateral adrenal hyperplasia was made from these findings.
At first, unilateral adrenalectomy was performed only to fail to alleviate the clinical symptoms. Then, o, p'-DDD was administered. Six doses were given at a week's intervals, but no hydrocortisone decreased in level. Subsequently, the drug was administered daily for 10 consecutive days, inducing anorexia and oliguria. So the treatment was suspended. Two weeks later, however, the hair began to grow in the body and the hematological findings characteristic of the Cushing syndrome were found alleviated.
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