EXPRESS: ULTRASONOGRAPHIC FEATURES OF FELINE RENAL NEOPLASIA: A RETROSPECTIVE STUDY ON 187 CASES.

Ultrasonographic patterns help differentiate feline renal tumors; lymphoma typically bilateral with diffuse enlargement.

This multicenter retrospective study analyzed ultrasonographic features of feline renal neoplasia across 187 cats (373 kidneys) with cytologically or histologically confirmed diagnoses. Lymphoma was the predominant tumor type (63%), followed by carcinoma (28.5%), sarcoma (5%), and rare adenoma, histiocytic sarcoma, and nephroblastoma cases. The study identified several ultrasonographic characteristics that differentiate tumor types: lymphoma presented with bilateral involvement and other organ involvement more frequently than other tumors; carcinoma typically appeared as a single mass; lymphoma and sarcoma masses were predominantly hypoechoic (81% and 86% respectively) compared to carcinoma (40%); a hypoechoic subcapsular rim was more common in lymphoma kidneys with masses; and kidneys without visible masses showed lymphoma with greater nephromegaly than carcinoma or sarcoma. These ultrasonographic features collectively provide valuable diagnostic information for differentiating feline renal tumor types, though definitive diagnosis requires cytological or histological confirmation.

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