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The long-term administration of phenoxybenzamine in PCC has not been reported in dogs.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Case presentation<\/jats:title>\n<jats:p>A 14-year-old castrated male Poodle dog presented with an abdominal mass. On physical examination, hypertension, increased lens opacity, calcinosis cutis, generalized alopecia, and systolic murmur were observed. Serum chemistry and urinalysis profiles revealed hyperglycemia, hypercholesterolemia, elevated liver enzymes, and glucosuria. Abdominal ultrasonography showed a right adrenal mass with invasion of the caudal vena cava, which was cytologically diagnosed as suspected PCC. An adrenal mass (width \u00d7 height \u00d7 length, 28\u2009\u00d7\u200926\u2009\u00d7\u200948\u2009mm<jats:sup>3<\/jats:sup>) was found on computed tomography and diagnosed as PCC with increased plasma metanephrines and normetanephrines. An adrenocorticotropin hormone stimulation test showed elevated adrenal hormones (androstenedione, estradiol, progesterone, and 17-OH progesterone) with normal cortisol, compatible with atypical Cushing\u2019s syndrome. The dog was managed with trilostane, phenoxybenzamine, and insulin therapy. Glycosylated hemoglobin and fructosamine levels gradually decreased, and hypertension resolved. In the 10-month follow-up period, the liver enzymes levels gradually decreased, and the clinical signs of the dog were well-controlled without deterioration.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Conclusions<\/jats:title>\n<jats:p>This case report describes long-term medical management without adrenalectomy of PCC complicated with atypical Cushing\u2019s syndrome and DM.<\/jats:p>\n<\/jats:sec>","DOI":"10.1186\/s12917-019-2225-x","type":"journal-article","created":{"date-parts":[[2020,1,3]],"date-time":"2020-01-03T16:03:11Z","timestamp":1578067391000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Favorable outcome of pheochromocytoma in a dog with atypical Cushing\u2019s syndrome and diabetes mellitus following medical treatment: a case report"],"prefix":"10.1186","volume":"16","author":[{"given":"Ga-Won","family":"Lee","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cho-Rong","family":"Yoo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dan","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7254-9524","authenticated-orcid":false,"given":"Hee-Myung","family":"Park","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,1,3]]},"reference":[{"key":"2225_CR1","doi-asserted-by":"publisher","first-page":"453","DOI":"10.1111\/vcp.12161","volume":"43","author":"W Bertazzolo","year":"2014","unstructured":"Bertazzolo W, Didier M, Gelain ME, Rossi S, Crippa L, Avallone G, et al. 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