Abdomen and Oncology

Discussion

68-year-old male with metastatic (bone and lymph nodes) prostate cancer presented for follow-up.

Quantification of iodine uptake by enlarged metastatic lymph node.

Axial images

Conventional axial CT images showed an enlarged left para-ureteral lymph node at the level of the iliac bifurcation with attenuation value of 68 HU. True non-contrast images were not obtained, the attenuation of the lymph node was 30 HU on virtual non-contrast images. Iodine density and Z effective images showed iodine uptake of the lymph node quantitatively. A follow-up CT 3.5 months later showed significant increase in size, indicating progressive disease.

Iodine density and Z effective images may quantitatively demonstrate the increased iodine uptake in the lymph nodes and help in diagnosing metastatic lymph nodes.

History Benefits or pitfalls of dual-energy CT

Key images

Findings