Concurrent ossification of posterior longitudinal ligament and ossification of ligamentum flavum in the thoracic spine demonstrated by SPECT/CT imaging.

A 44-year-old man with rectal cancer underwent bone scintigraphy to assess osseous lesions for lower extremity numbness and ambulatory difficulty. Whole-body bone scan showed increased tracer accumulation in the mid thoracic spine. Then SPECT combined with diagnostic CT was performed to further evaluate this doubtful hot spot. According to the images of SPECT/CT, the radiotracer uptake at the site of the T7 to T8 thoracic vertebra was confirmed to be simultaneous ossification of posterior longitudinal ligament complicated with ossification of the ligamentum flavum in the thoracic spine by pathology.