Where are the most common anatomical sites for Ewing sarcoma to develop?
The majority of Ewing sarcomas are found in the long bones and the pelvis. They usually present in early life - childhood or early adulthood
What are the classic plain film appearances of an Ewing sarcoma?
The classic appearance is that of a permeative lytic lesion with an "onion peel" type periosteal reaction
Infiltrative lesion in right acetabulum with bone extension into right superior pubic ramus. There is a large soft tissue mass that extends medially into obturator internus and displaces the pelvic contents to the left. There is infiltration surrounding the iliac vessels and extending into the posterior iliopsoas muscle. There is also infiltration extending towards the sciatic notch.