Malignant primitive neuroectodermal tumor (PNET) of the chest wall (Askin tumor) is an uncommon malignant tumor afflicting the children and young adults. We retrospectively reveiw the clinical, radiological and pathological findings of three cases of Askin tumor at our hospital. Though Askin tumor is rare, it should be borne in mind and put on the list of differential diagnosis for chest wall or thoracic paraspinal masses in children or young adults.