RT Journal Article SR Electronic T1 Upper limb pyrophosphate tenosynovitis outside the carpal tunnel. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 689 OP 691 DO 10.1136/ard.48.8.689 VO 48 IS 8 A1 J C Gerster A1 R Lagier YR 1989 UL http://ard.bmj.com/content/48/8/689.abstract AB Three cases of calcium pyrophosphate dihydrate (CPPD) crystal deposits in tendon sheaths outside the carpal tunnel are reported. Crystals were shown by x ray diffraction analysis in one case and by compensated light microscopy in the other two. Surgical excision of the tendon synovial sheath had to be done in two cases (one case with CPPD crystal deposits).