Epithelioid sarcoma can be difficult to diagnose because it may be confused with other conditions that have similar signs. For example, an ulcer on the skin that isn't healing could be mistaken for a skin infection.
Tests and procedures used in diagnosis of epithelioid include:
- Imaging. Magnetic resonance imaging (MRI) is typically the method of imaging because of the level of detail it provides. Sometimes other imaging tests, such as computed tomography (CT) or positron emission tomography (PET), may be used.
- Biopsy. The doctor performs a biopsy using a long, thin needle to remove a sample of the suspected sarcoma or a larger lump for testing in a lab. Sometimes a biopsy sample is removed during surgery. A pathologist analyzes the sample to determine whether it's cancer, and if so, the type and whether it's aggressive.