http://nmhm.washingtondc.museum/exhibits/virtual/hairball.html Hairballs: Myths and Realities behind some Medical Curiosities] , National Museum of Health and Medicine, Washington, D.C. In 2003, a 3-year-old girl in Red Deer, Alberta, Canada, had a grapefruit-sized hairball surgically removed from her stomach; in 2006, an 18-year-old woman from Chicago, Illinois, had a 4 kilograms hairball surgically removed from her stomach;