Diagnosis

摘要

The anteroposterior and lateral plain radiographs (Fig. 1) demonstrate an ill-defined expansile lytic lesion involving the diaphysis of the mid-femur. A central osteoid matrix was seen.On sagittal gradient echo MRI (Fig 2), a lesion of intermediate signal intensity was visualized, with absence of a soft-tissue mass. The axial T_2-weighted image (Fig, 3) again demonstrated the cystic nature of the mass with multiple fluid-fluid levels within various locules of the lesion A coronal short tau inversion recovery (STIR) weighted image (Fig 4) demonstrated the expansile lytic mass, with marked thinning, of high signal intensity in the medial and lateral femoral cortex Sagittal section (Fig, 5) revealed cystic, hemorrhagic and bony mass filling the medullary cavity, 10,5 cm long and 3 cm in diameter The resection margins measured 5 9 cm proximally and 4,4 cm distally. Dilated lakes of blood were present, and the cortex was partially eroded.