We report the case of a 7-year-old male child with a cystic tumour attached to the caecum close to the ileocaecal valve. The histological examination showed that the cyst had a ciliated epithelial lining, containing serous and mucous glands, with surrounding smooth muscle, inner circular and outer longitudinal layers. The cyst was interpreted as an intestinal duplication lined with respiratory epithelium. This structure and its location, originating from the midgut, is not in accordance with the typical conception of the embryogenesis. The clinical picture and treatment are described and compared to other findings in the literature.