A nine day-old Rocky Mountain colt was referred to the University of Pennsylvania George D. Widner Hospital for evaluation of multiple hemorrhagic oral masses. Gestation and parturition were reportedly uneventful. Shortly after birth the owner noted masses in the foal's mouth that appeared to increase in size over subsequent days. Upon presentation, the colt was bright, alert, and in good body condition. Physical examination parameters were within normal limits; soft tissue swellings were visible in the area of the maxillary cheek teeth bilaterally, the skin was freely movable over the masses. The swelling on the right maxilla measured approximately 7 cm in length by 2 cm in width; the left maxillary swelling was smaller, approximately 4cm long and 3 cm wide. Both parotid ducts were dilated. Examination of the integument revealed several round hairless, pigmented soft masses approximately 1 cm in diameter on the left stifle, left elbow and right croup. A pedunculated mass with an eroded, hemorrhagic surface was present on the ventral aspect of the preputial opening. There was mild effusion within the right fetlock joint and common digital flexor tendon sheath just proximal to the fetlock joint. Diagnostic imaging revealed alveoalr bone neoformed soft tissue infiltration. The foal was euthanatized and a complete necropsy was performed.