Computed Tomographic Findings of Diaphragmatic Well-differentiated Liposarcoma in a Dog

Diaphragmatic tumors are uncommon in veterinary medicine. A 9-year-old neutered male Chihuahua was referred for evaluation of a suspected diaphragmatic hernia. Computed tomography revealed a soft tissue mass with a continuous border to the adjacent diaphragm, compressing the liver caudally. The tumor exhibited hypoattenuating lesions suspected of a mixture of fat and soft tissue. Histopathologic examination diagnosed a well-differentiated liposarcoma. A mass exhibiting a continuous border with the diaphragm and displacement of the adjacent liver may indicate a diaphragmatic tumor. Attenuation indicating a mixture of fat and soft tissue may be a feature of well-differentiated liposarcoma, but further studies on liposarcoma subtypes are needed.