Dans M, Hivnor C, Van Voorhees AS: Psoriatic onychopachydermoperiostitis: improvement with etanercept. .Br J Dermatol 153::858. ,2005. .
Zeimer A, Heider M, Goring HD: Psoriasiform onychopachydermoperiostitis of the large toes: the OP3GO syndrome. .Hautarzt 49::859. ,1998. .
Bongartz T, Harle P, Friedrich S, et al: Successful treatment of psoriatic onycho-pachydermo periostitis (POPP) with adalimumab. .Arthritis Rheum 52::280. ,2005. .
Boisseau-Garsaud AM, Beylot-Barry M, Doutre MS, et al: Psoriatic onycho-pachydermo-periostitis. .Arch Dermatol 132::176. ,1996. .
Moll JMH, Wright V: Psoriatic arthritis. .Semin Arthritis Rheum 3::55. ,1973. .
Helliwell P, Marchesoni A, Peters M, et al: A reevaluation of the osteoarticular manifestations of psoriasis. .Br J Rheumatol 30::339. ,1991. .
Resnick D, Broderick T: Bony proliferation of terminal toe phalanges in psoriasis: the “ivory” phalanx. .J Can Assoc Radiol 28::187. ,1977. .
Jury CS, Fleming C, Kemmett D: Severe nail dystrophy associated with painful fingertips. .Arch Dermatol 136::925. ,2000. .
McGonagle D, Conaghan PG, Emery P: Psoriatic arthritis: a unified concept twenty years on. .Arthritis Rheum 42::1080. ,1999. .
Vasey FB, Espinoza LR: “Psoriatic Arthropathy,” in Spondyloarthropathy, ed by A Calin, p 151, Grune and Stratton, New York. ,1984. .
Barth WF: “Psoriatic Arthritis Sine Psoriasis,” in Practical Rheumatology, ed by JH Klippel, PA Dieppe, p 249, Mosby, London. ,1995. .
de Silva RT, Grennan DM, Palmer DG: Lymphatic obstruction in rheumatoid arthritis: a cause for upper limb oedema. .Ann Rheum Dis 39::260. ,1980. .
The following case of a 37-year-old male describes a very rare form of psoriasis known as psoriatic onychopachydermoperiostitis. There have been fewer than 20 cases reported worldwide. (J Am Podiatr Med Assoc 99(2): 140–143, 2009)