[Clinical Picture] Malignancy in a child or something else?

A 2-year-old girl presented at the outpatient centre for rare skeletal diseases in children at the Children's Hospital, University of Cologne (Cologne, Germany) in 2015 with a massive swelling of the left femur, which her family reported had grown rapidly during the preceding 3 weeks. Radiography showed a large tumour on her left proximal femur with a homogenous hyperdense structure with visible cortical structures. A few small spikes were present at the edge of the mass but no signs of necrosis or periostal calcification were visible.

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