There is no discoloration of skin and no cafe au lait spots or other skin stigmata. Plain x-rays, and MRI of the calcaneus are examined. There is a lesion in the posterior calcaneus which fills the bone from medial to lateral and almost fills the bone from proximal to distal. It appears to have originated in the calcaneus adjacent to the posterior Growth Plate. There are multiple lytic partial confluent lesions within bone with no defined sclerosis surrounding these lytic areas. There is no matrix mineralization. No periosteal reaction is seen. The MRI shows the lesion in the same location which is bright on T-2 sequences and dark on T1 sequences. There are definite fluid fluid levels and multiple loculated cystic appearing lesions that are confluent. The lesion extends to the cortical border of the bone and appears to be in the cortex in some areas. No definite breakthrough or soft tissue extension is seen. No other bony abnormality is seen in the other bones of the foot.