Primary hypertrophic osteoarthropathy (PHO) is a familial disorder with delayed cranial suture closure, digital clubbing, arthropathy, acro-osteolysis, periostosis, and pachydermia. Mutations in HPGD gene and SLCO2A1 gene, which encodes 15-hydroxyprostaglandin dehydrogenase and prostaglandin transporter, were reported.