A diagnosis assisting system of bone tumors was constructed using a relational data base management system (RDBMS). Radiographic findings of various tumors were categorized at every item and stored as degrees of possibility. Possible diagnoses of an unknown lesion can be listed by max-min calculation between the data base and findings of the lesion. Integration of items narrow the possible diagnosis down. Expansion of the system is expected as addition or renewal of data is easy on RDBMS.
