Fig. 1

Case with bone resorption. A 79-year-old female underwent extraction of the right mandibular first molar at a dental clinic. Upon investigation of medication due to incomplete healing of the extraction socket, it was revealed that she had been taking risedronate for osteoporosis for the past 3 years and alendronate for the past 1.5 years. She was then referred to our hospital for further treatment. (A) CT image (bone mode) showing a low CT value area in the trabecular bone of the right mandibular molar region (ellipse). (B) Panoramic X-ray image revealing radiolucency in the same area with surrounding sclerotic changes (ellipse). (C) T1-weighted MR image demonstrating the bone resorption area in the same region, with low signal intensity in the bone marrow compared with the contralateral side (ellipse). (D) T2-weighted fat-suppressed MR image demonstrating the bone resorption area in the same region, with high signal intensity in the bone marrow compared with the contralateral side (ellipse).