Bilateral sacroiliitis inaugurating sarcoidosis. Report of a case.

Sacroiliitis during the course of sarcoidosis is an uncommon event usually due to tuberculosis. Sacroiliitis due to sarcoidosis itself is exceedingly rare. A case is reported in a 73-year-old woman who developed acute destruc tive bilateral sacroiliitis as the first manifestation of diffuse sarcoidos is involving the lungs, liver, spleen, and bone. Serum calcium was elevated . Computed tomography of the sacroiliac joints showed subchondral erosions and joint space loss most marked on the right. A sacroiliac joint biopsy co nfirmed that the cause was sarcoidosis.