Figure 2 Cone-beam computed tomography images demonstrating a missed canal and a periapical lesion. The axial plane (A) and the coronal plane (B) of a maxillary first molar with an untreated mesiobuccal canal (indicated by red arrow) and periapical lesion (indicated by yellow arrow). OnDemand3D Dental software (Cybermed, Seoul, Korea) and Adobe Photoshop version 23.4.1 software (Adobe Inc., San Jose, CA, USA) were used to create this figure.