68-year-old female with history of melanoma, evaluate for local recurrence. Femur: We see no lesions in the soft tissues of the thighs, although there may perhaps be mild atrophy of the lateral head of the biceps femoris. There is a small lobulated focus of abnormal signal intensity and mild enhancement within the distal femur that likely represents a benign enchondroma.Tibia/fibula: Small foci of signal void in the lateral soft tissues adjacent to the fibular head presumably represent metallic susceptibility artifact from prior surgery. There is poorly-defined enhancement of the adjacent subcutaneous fat which is nonspecific and may represent scar tissue. There is additional mild edema and enhancement in the subcutaneous fat along the patellar tendon indicating mild inflammation, perhaps a mild bursitis. Moderate osteoarthritis affects the knee. Mild nonenhancing edema is present along the lateral aspect of the lower leg, which is nonspecific. The remaining soft tissues are unremarkable.
Surgical changes along the lateral soft tissues presumably represent the site of prior melanoma resection with poorly defined enhancement within the subcutaneous fat which is compatible with scar tissue; although we cannot exclude the possibility of tumor recurrence, we see no discrete mass. Repeat follow-up exams may be considered as clinically warranted.