Article continues below advertisementLegendary actress Catherine O'Hara suffered from situs inversus, a rare condition that causes the body's internal organs to be mirrored from their usual positions, sparking fascination among fans about the unusual disorder.Article continues below advertisementWhat Is Situs Inversus?Source: MEGACatherine O'Hara suffered from situs inversus before her death. Situs inversus "occurs when the organs in your chest and belly develop in a reversed position of normal anatomy," according to the Cleveland Clinic.