A 14-month-old entire male Old English sheepdog was presented with a slowly
enlarging subcutaneous soft tissue swelling caudal to the last rib. Radiog
raphic and ultrasonographic investigations demonstrated a soft tissue mass
closely adherent to the body wall, with a coarse hypoechoic pattern. Surgic
al exploration revealed a mass with the gross appearance of splenic tissue.
The mass was adhered to a healed paracostal abdominal tear. Histological e
xamination confirmed the resected tissue to be normal spleen.