Gastrointestinal stromal tumor (GIST) is a rare tumor of gastrointestinal origin. From the onset, the disease sometimes silently shows no symptoms, but sometimes causes the patient's health to deteriorate, metastasize to adjacent organs quickly.

Sarcomas are a heterogeneous group of malignant tumors with variable clinical presentations. These tumors can occur in almost any location in the body, which poses a challenge to diagnosis and treatment. These challenges have prompted the development of new imaging techniques. For example, the application of Positron Emission Tomography (PET) has been used to diagnose and evaluate sarcomas.