Fig. 9.

Evaluating suspected tumour recurrence: Follow up case of giant cell tumour of tibia-post excision and augmentation with bone cement- AP and lateral radiographs (a and b) reveal mild cortical irregularities with lucency in the medial and anterior aspect of tibia. MRI was done to rule out recurrence. Proton density fat saturated axial images (c) showed suspicious areas of T2 hypointensity with postcontrast enhancement (d) along the anterior aspect of bone cement(arrows), better seen in subtraction image (e). Time-signal intensity curves of dynamic contrast enhanced images with region of interest on suspicious area (orange curve in g) shows type I enhancement (rapid wash in and wash out of contrast) which is similar to the arterial washout pattern (Pink curve in g). Compare with normal soft tissue and scar (blue and yellow curves in g).