Soft tissue masses are collections of soft tissue within the foot and ankle. They fall into 2 categories, benign and malignant. Benign masses include lipomas, etc. Malignant masses include sarcomas, etc. Masses that are small, painless, and slowly growly are typically benign. Masses that are larger, indurated, and faster growing are more suspicious and need to be excised and biopsied.
X-rays are taken initially to see any osseous components or calcifications, and then an MRI is ordered to further evaluate the soft tissue mass. Usually the course is surgical as it is important to obtain a biopsy and excise the mass.