Imaging Diagnosis—Sonographic Features of Bilateral Renal Lymphangiectasia in an Azotemic Dog

A 9-year-old male neutered Labrador Retriever was referred for azotemia and bilateral renomegaly. An abdominal ultrasound revealed severe bilateral renomegaly with septated subcapsular cystic anechoic lesions, consistent with renal lymphangiectasia. Despite conservative management, the patient died. Necropsy and histopathology confirmed dilated subcapsular vascular structures. Renal lymphangiectasia is a rare, benign dilation of renal lymphatics previously reported in human medicine. This case represents the first description of sonographic features of renal lymphangiectasia in a canine patient.