[Comparison with bone scintigraphy and MDCT findings in patients with round focal accumulation on bone scintigraphy]

This study aimed to compare with bone scintigraphy showed round focal accumulation and Multidetector Row CT (MDCT) findings.

We obtained 101 patients (mean age 69.2 years; 75 men, 26 women) and 186 diseases. They were examined both MDCT and bone scintigraphy within a month of each other. We classified into two groups (with metastasis and spondylosis) according to their MDCT findings. Bone scintigraphy was estimated on planar image, MDCT was evaluated in three directions with 1 x 1 x 1 mm thickness.

We determined 20 metastases cases and 81 of spondylosis. We could not judge abnormal findings on MDCT in 4 patients (1 metastasis, 3 spondylosis); thus, detectability by MDCT was 93.5%. In the spondylosis group, the accumulation lesions were localized on the lower vertebral body in 76 patients (59%), with most showing as osteophytes. In the metastasis group, 11 patients showed more than 1 accumulations, 9 were osteoblastic changes and 10 were lytic. There was a tendency that patients who accumulated more than 1 vertebral bodies (64%) had osteoblastic and irregular distribution and those who accumulated just one body (78%) were lytic and their locations were focused on the lateral side.

For evaluating bone scintigraphy, MDCT finding was helpful to increase the detectability in bone metastasis. Therefore, we should refer to MDCT finding positively in reading bone scintigraphy.