Simple bone cyst LSBU

Description: Radiology case 415-3181 Female aged 5 years, X-rayed after a fall, apparently symptomless.
There is a lytic lesion in the upper metaphysis of the left humerus. There are visible septa that make the lesion appear multiloculate, although it is probably uniloculate. The lesion thins the cortex from below, but there is no visible cortical reaction and no extra-axial soft tissue mass is seen. The endosteal margin shows a narrow zone of transition between normal and abnormal bone. There is a minor irregularity of the cortex on the lateral side of the metaphysis with slight overlap.