Diagnosis of Sarcoma
After speaking about the patient's medical history and doing a medical examination, medical imaging scans will help to inform a diagnosis, which will need to be confirmed through laboratory analysis of a tumor sample.

The following physical features should prompt a doctor to investigate:

larger than 2 inches in diameter or growing in size
fixed, immovable, or deep
painful
return of tumor previously removed

Medical imaging helps to locate, characterize, and give further information about a tumor to guide diagnosis. It may also be used to gauge the success of treatment or to look for spread of cancer.

Imaging techniques include X-rays, CT scan (computed tomography), MRI (magnetic resonance imaging), ultrasound, and PET (positron emission tomography).