Osteopoikilosis (OPK) is a rare, benign condition characterized by osteosclerotic foci that occur in the epiphyses and metaphyses of long bones, wrists, feet, ankles, pelvis, and scapulae. We report a 16-year-old boy and his mother incidentally found to have sclerotic lesions on X-ray. Both of them were asymptomatic and the bone scan of the boy ruled out osteoblastic metastases. We have shown that the boy and his mother have a previously unknown pathogenic variant of the LEMD3 gene, supporting the diagnosis of osteopoikilosis.

Keywords: LEMD3, osteopoikilosis, pathogenic variation