Unusual facet cyst containing struvite and hydroxyapatite |
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Authors: | M Grantham B Richmond |
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Institution: | (1) Department of Musculoskeletal Radiology, A21, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA, US |
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Abstract: | This case report describes a patient with severe back pain and radiculopathy. She was found to have a facet cyst within the
lumbar spine that appeared to contain calcium on MRI and CT. Upon aspiration the cyst was found to contain calcium ammonium
phosphate (struvite) and calcium phosphate (hydroxyapatite). Ammonia production in the presence of urease-producing bacteria
is responsible for the production of struvite in the human body. We postulate that there was a prior infection of the facet
with urease-producing bacteria, thus accounting for the production of the struvite within the facet cyst.
Received: 29 June 2000 Revision requested: 18 August 2000 Revision received: 27 September 2000 Accepted: 27 September 2000 |
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Keywords: | Facet cyst Synovial cyst Struvite Hydroxyapatite CT MRI |
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