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 Indian J Med Microbiol  
 

Figure 3: Sagittal T2-weighted MR image of the unicameral bone cyst in the proximal humerus demonstrating a periosteal hinge that keeps the fractured bone fragment from falling dependently into the cyst indicating “Trapped door sign” (blue arrow). Note the elevated and thinned out periosteum (red arrow)

Figure 3: Sagittal T2-weighted MR image of the unicameral bone cyst in the proximal humerus demonstrating a periosteal hinge that keeps the fractured bone fragment from falling dependently into the cyst indicating “Trapped door sign” (blue arrow). Note the elevated and thinned out periosteum (red arrow)