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A. A 10-year-old intact female American bulldog presenting with pronounced peripheral lymphadenopathy, eventually diagnosed
as diffuse large T-cell lymphoma on histologic examination. Markedly enlarged superficial cervical (prescapular) and mandibular
lymph nodes are easily visible.
B & C. Lateral and ventrodorsal thoracic radiographs of a 6-year-old spayed female boxer presenting with dyspnea, polyuria, and
polydipsia. Severe hypercalcemia (20.4 mg/dl) and azotemia were noted on the serum chemistry profile. Note the pleural effusion
and a large soft tissue opacity in the cranial mediastinum displacing the lungs caudodorsally.
D & E. Lateral and ventrodorsal thoracic radiographs of the same dog five weeks after a standard combination chemotherapy protocol
was initiated. Dyspnea and hypercalcemia rapidly resolved after supportive therapy and cytotoxic chemotherapy were initiated.
F & G. Cytologic preparations of fine-needle aspirates from cranial mediastinal masses in two different dogs. Figure F shows a monomorphic population of intermediate to large lymphocytes, with large nuclei, prominent nucleoli (arrowheads), and an open chromatin pattern, consistent with lymphoma (Wright's-Giemsa, 1,000x). Figure G shows a mixed population of small and intermediate lymphocytes, with occasional mast cells (arrowheads), suggestive of thymoma despite the absence of epithelial cells on this sample (Wright's-Giemsa, 400x). (Photomicrographs courtesy of Dr. Laura D. Garrett.)
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