Anomalous fusion between the lunate and triquetrum.
D000293:Adolescent; D001842:Bone and Bones / Q000002:abnormalities* / Q000000981:diagnostic imaging; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D014953:Wrist / Q000002:abnormalities* / Q000000981:diagnostic imaging