J B Kneeland

Hepatic Metastases: CT Versus MR Imaging at 1.5T

A prospective multi-institutional study was performed to compare the sensitivity of computed tomography (CT) and high-field magnetic resonance (MR) imaging (1.5T) in the detection of hepatic metastases, T1-weighted and T2-weighted spin-echo (SE) MR images were compared with noncontrast, dynamic, and delayed CT. Sixty-nine oncology patients were studied. Non-contrast CT showed an overall sensitivity of 57%, dynamic CT 71%, delayed CT 72%, T1-weighted SE MR 47%, and T2-weighted SE MR 78%. Although there was no statistically significant (p}<0.05) difference among dynamic CT, delayed CT, and T2-weighted SE MR, these three methods were significantly more sensitive (p< 0.005) than non-contrast CT or T1-weighted SE MR. T2-weighted SE MR was significantly more sensitive (p< 0.006) than CT or T1-weighted SE MR in the detection of small (<1 cm) lesions. CT was more sensitive in the detection of extrahepatic disease. These data confirm the superiority of T2-weighted SE over T1-weighted SE pulse sequences at 1.5T.

High resolution MR imaging of glomus tumor.

High resolution magnetic resonance images of a surgically confirmed glomus tumor of the finger obtained with a surface coil are shown. Magnetic resonance has the potential to preoperatively evaluate soft tissue tumors of these regions which are poorly imaged by other modalities.

Post-traumatic osteolysis of the clavicle: MR features.

We present the magnetic resonance findings in a pathologically proven case of post-traumatic osteolysis of the distal clavicle. High signal intensity tissue centered on the acromioclavicular joint was seen on T2-weighted images, consistent with synovial proliferation.