1. A method for inspecting a body cavity, comprising: inserting an endoscope into the body cavity, the endoscope comprising a camera and a first illuminator and a second illuminator, similar to the first illuminator, in different, respective locations on the endoscope; acquiring with the camera a first image of the body cavity while the cavity is illuminated by the first illuminator and a second image of the cavity while the cavity is illuminated by the second illuminator; forming a comparison, by a processor, between the first image and the second image by calculating intensity differences between corresponding pixels of the first image and the second image; identifying, by the processor, an area of the body cavity as a suspect region in response to a difference in shadowing between the first and second images that is found in the comparison, by finding in the region a certain number of contiguous pixels for which the intensity differences are greater than an average intensity difference; and displaying one of the acquired images on a monitor while marking the suspect region on the one of the acquired images.