A thirteen-year-old boy presented with progressive painful swelling over the...

A 16-year-old boy arrived to the hospital complaining about low back pain he...

A 78-year-old man presented with omalgia and a 3-month hard-mass in his righ...

A 33-year-old man with no relevant pathological history presented with pain ...

A 27-year-old man presented with a right buttock mass, and constitutional sy...