A 17-year-old was presented with a 3-week history of severe hip pain followed by increasing breathlessness and left sided chest pain. His admission chest X-ray is shown in image 1. A biopsy is performed on a left hip lesion which reveal a small blue round cell tumour.

A number of days later the following chest x-ray is obtained (Image 2). What is the diagnosis of this? *This case is from Docplexus Editorial Team for educative purpose only.