Fibrous cortical defects and non-ossifying fibromas constitute the most common focal lesions of bones.[1,2] Due to their benign character and typical radiological appearance, they belong to a group of lesions that do not require histopathological sampling for diagnosis (`Don`t touch lesions!`).[3] Despite this fact, their detection in radiological examination with surprising frequency causes unjustified concern, and leads to consultations in orthopaedic oncology clinics.[4] It seems that this may be due to the variability of their presentations related to age and evolution of the lesions.