The imaging findings repr. Normal.

Geographic areas of altered signal are seen involving the anterosuperior and posterosuperior quadrants of both femoral heads. On both sides the central portion appears hyperintense on T1, T2 and is suppressed on STIR images, suggestive of fat. The margin of the lesion appears hypointense on T1 and T2 weighted images. Approximately 60-70 % of the circumference of both femoral heads are involved. Mild bilateral hip joint effusions is seen. The contour of right femoral head is maintained. Mild collapse is seen of the left femoral head. The geographic areas show no enhancement following contrast administration. The edema in the left femoral head shows enhancement. The other visualised bones appear normal. The pelvic structures appear normal.