1. Agenesis of the gallbladder: case report and familial investigation;Wilson;Surgery,1986
2. Agenesis of the gallbladder. A cause of false-positive ultrasonography;Jackson;Am Surg,1989
3. L'agenesia isolata della colecisti: rara malformazione congenita delle vie biliari;Tommasi;G Chir,1992
4. The absent adult gallbladder;Sherson;Aust N Z J Surg,1970
5. The non-visualized gallbladder by ultrasonography: implications and differential diagnosis;Hutton;Journal of the Canadian Association of Radiology,1983