Abnormality of the dentition Periapical bone loss UMLS:C4280609 UMLS:C0034543 Radiolucency (reflecting a reduction in the bony substance) around the apex (the tip of the dental root). Periapical radiolucencies HP:0000700 UMLS:C1852169 SNOMEDCT_US:81407003 Dark spot around tooth root on x-ray Bone loss around tooth root Periapical lesion SNOMEDCT_US:89988002 Periapical cyst Periapical radiolucencies can be seen with periapical granuloma, cysts, ameloblastoma, odotogenic keratatoycsts, and other lesions. UMLS:C0031029 Periapical granuloma Periapical radiolucency