Rheumatology Advance Access originally published online on March 3, 2008
Rheumatology 2008 47(5):561-562; doi:10.1093/rheumatology/ken032
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© The Author 2008. Published by Oxford University Press on behalf of the British Society for Rheumatology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
EDITORIALS |
What is the primary lesion in SpA dactylitis?
1Rheumatology Department of Lucania, San Carlo Hospital of Potenza and Madonna delle Grazie Hospital of Matera and 2Radiology Department, San Carlo Hospital of Potenza, Potenza, Italy.
Correspondence to: I. Olivieri, Rheumatology Department of Lucania, San Carlo Hospital, Contrada Macchia Romana 85100 Potenza, Italy. E-mail: ignazioolivieri@tiscalinet.it; i.olivieri@ospedalesancarlo.it
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Dactylitis or sausage-like digit is a characteristic and highly specific manifestation of SpA (Figs 1 and 2) [1]. It totally differs from other digit diseases called dactylitis [2]. Even though more frequent in PsA [3, 4], SpA dactylitis has been observed in all types of SpA, including the undifferentiated ones [5]. In the latter cases, dactylitis usually occurs together with one or more manifestations of the HLA-B27-associated disease, i.e. peripheral arthritis, peripheral enthesitis, inflammatory spinal pain, chest wall pain, alternate buttock pain, acute anterior uveitis and aortic insufficiency with conduction disturbances [6]. Like these, dactylitis may sometimes occur for a long time alone as the only clinically manifest feature of the HLA-B27-associated disease [7–10]. This has been observed in children [7, 8], in young and