A 6-month-old intact male Standard Dachshund was referred for evaluation of a soft tissue swelling above the right eye. Examination of the right eye revealed mild lateral deviation of the globe, normal vision, and a dorsonasal soft tissue swelling. Examination of the posterior segment was normal. Dual-phase computed tomography angiography was consistent with an orbital varix of the angularis oculi and right dorsal external ophthalmic veins with no evidence of arterial involvement. Treatment involved fluoroscopically guided coil embolization of the venous outflow with nine platinum microcoils, followed by sclerotherapy of the varix using 1.5 mL of 3% sodium tetradecyl sulfate foam. Moderate-to-marked swelling was noted at the treatment site in the weeks following therapy, which gradually resolved. At final reexamination 3 months post-therapy, complete sclerosis and resolution of the orbital varix were documented. To the authors' knowledge, this is the first reported case involving the use of a sclerotic agent for successful treatment of a venous malformation in a dog.

Case 1: A 9‐year‐old Yorkshire terrier mix was referred for evaluation of heart failure presumed to be secondary to myxomatous mitral valve disease. Case 2: A 6‐year‐old Domestic Longhair cat was referred for evaluation of heart failure presumed to be secondary to hypertrophic cardiomyopathy. Thoracic radiographs revealed pulmonary overcirculation suggestive of a cardiac shunt in both cases. Echocardiographic findings confirmed the diagnosis of rare atrioventricular septal defects (AVSDs): complete AVSD (case 1) and double‐outlet right atrium (case 2). Complete AVSDs are rare congenital cardiac defects in veterinary species that result from inappropriate embryogenesis of the atrioventricular septum. Sequelae include congestive heart failure and possibly shunt reversal due to concomitant pulmonary hypertension. Few veterinary reports describe the natural timeline of this condition and outcomes. This report describes both a dog and cat that presented symptomatic in adulthood, were diagnosed via echocardiography and medically managed long‐term.