77-year-old female with a left groin mass. Please evaluate. A vitamin E marker overlies the medial aspect of the left anterior thigh which presumably represents the patient's palpable area of concern. There is a lobulated mass of predominantly fluid signal intensity along the anterior aspect of the thigh within the adductor brevis muscle of the adductor musculature, which measures approximately 3.9 x 4.0 x 5.6 cm (TR x AP X CC). There are associated septations which enhance on post contrast sequences. There is an inguinal lymph node along the anterolateral margin of the mass, measuring 6 mm in the short axis, which appears to retain its normal fatty hilum/morphology on coronal images. There are no inflammatory changes in the surrounding soft tissues to suggest an infectious etiology, although this cannot be completely excluded by this examination. No bone marrow signal abnormality is identified. The imaged musculature of the left hip and thigh are otherwise normal in appearance.
5.6 cm mass along the medial aspect of the left anterior thigh, with fluid signal intensity and enhancing septations suspicious for neoplasm, most consistent with an intramuscular myxoma. A soft tissue sarcoma is considered less likely, but cannot be completely excluded. 