Nádory a metastázy

Osteosarkom

At first, the pain might not be constant and might be worse at night. The pain often increases with activity and might result in a limp if the tumor is in a leg bone.
Swelling in the area is another common symptom, although it might not occur until later. Depending on where the tumor is, it might be possible to feel a lump or mass.

https://www.cancer.org/cancer/osteosarcoma/detection-diagnosis-staging/signs-and-symptoms.html