Patients also may have an elevated eosinophil count, hypoglycemia, fever, and abnormal liver function tests.
The only definitive diagnosis is biopsy, but imaging studies are usually done first.
- MRI provides good contrast between tumor and muscle, excellent definition of the surrounding anatomy, and ease of imaging in multiple planes. It reveals an intramuscular mass with heterogeneous signal intensity on all pulse sequences.
- CT scan is preferred by some, but the definition between tumor and muscle is not as good. It typically shows a large, nonspecific, lobulated soft tissue mass with density close to that of muscle.
- Ultrasonography shows a well-defined heterogeneous mass, but the appearance of tumors on ultrasound is nonspecific. It can, however, facilitate directed needle biopsy.