Fig. 14
From: Radiological identification and analysis of soft tissue musculoskeletal calcifications
Disc calcifications. Sagittal CT images of the lumbar spine shows (a) calcium pyrophosphate dehydrate (CPPD) crystal deposition (arrowheads in a), (b) hydroxyapatite crystal deposition (arrowhead in b) and (c) syndesmophytes (arrowhead, in c) in three different patients. Note calcifications in ligamentum flavum and interspinous ligament associated with CPPD deposition disease (arrows in a) and ossification of disc space associated with ankylosing spondylitis (arrow in c). Note linear calcifications paralleling the vertebral endplates in b, associated with height loss, corresponding to subacute fractures in a patient with osteoporosis