Abstract
A 10-year-old female Dachshund was presented with a history of mammary masses, slight lethargy, polyuria, and polydipsia. Physical examination findings included masses involving the first, second, and fourth mammary glands of the left side. The mandibular, axillary, and right popliteal lymph nodes were mildly enlarged. Serum chemistry results included hypercalcemia (13.9 mg/dL, reference interval 8.0-11.5 mg/dL). Although intact parathyroid hormone (PTH) concentration (1.05 pmol/L) was below the reference interval (2-13 pmol/L), PTH-related protein (PTHrP) concentration was markedly increased (9.40 pmol/L, reference value < 2 pmol/L). The masses were surgically removed, and the histopathologic diagnosis was complex mammary carcinoma. Three weeks after surgery, serum total calcium concentration had decreased to 10.5 mg/dL. Resolution of the hypercalcemia and clinical signs supported a diagnosis of humoral hypercalcemia of malignancy associated with mammary gland carcinoma.
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