Fig. 5From: Intraosseous ganglion cyst mimicking chondrosarcoma on MRI: a case reportAxial (a) and sagittal (b) CT scan revealed intralesional gas (white arrow) without evidence of underlying osteoid or chondroid mineralization. Vacuum phenomenon was observed in ulnotrochlear joint with subcortical sclerosis and articular surface dimpling (black arrowheads), but there is no continuation between joint and osteolytic bone lesionBack to article page