Osteogenic sarcoma and Ewing’s sarcoma belong to the most frequent bone neoplasms of adolescence and childhood. Their most frequent locations are metaphyses and diaphyses of long bones. The first symptom reported by a child is pain that may be accompanied by swelling - the symptoms are nonspecific. The study analyses lesions found in imaging examinations (X-ray, CT, MRI) of 37 children with bone tumour with a confirmed histopathological diagnosis of osteogenic sarcoma. The analysis included the site of origin of the tumour, the extent of the lesion, the affected surrounding soft tissues, periosteal reactions.