Similar case retrieval apparatus, similar case retrieval method, non-transitory computer-readable storage medium, similar case retrieval system, and case database

A method for an apparatus, the apparatus including a hardware processor that executes a program and causes the apparatus to perform the method, the method comprising:

• obtaining image data to be interpreted including a first plurality of tomography images of a right lung of a first person, the first plurality of tomography images being imaged by a first CT scan of the right lung;
• determining, using the hardware processor, that the first plurality of tomography images indicates a solitary lesion or multiple lesions;
• and
• outputting case data containing a second plurality of tomography images of a left lung of a second person, the second plurality of tomography images being imaged by a second CT scan of the left lung, and indicating multiple lesions, one or more tomography images included in the second plurality of tomography images being similar to one or more tomography images included in the first plurality of tomography images indicating multiple lesions,
• wherein the outputting of the case data is not performed for the first plurality of tomography indicating the solitary lesion, and
• it is determined that the first plurality of tomography indicates the solitary lesion when a percentage of an area is equal to or lower than a predetermined threshold value, the area showing a CT value within a normal range in a second tomography image,
• the multiple lesions are a plurality of lesions existing at different locations in an organ area, and
• the solitary lesion is a single lesion existing at a location in the organ area.