Painless Groin Mass in an Active-Duty Soldier

A healthy 40-year-old active-duty male soldier presented with a painless groin mass, which he had noted a few weeks earlier. He denied having constitutional symptoms, recent infection, inflammatory joint symptoms, or a history of trauma.

The physical examination was notable for an immobile firm mass in the patient’s right inguinal area. There were no other areas of lymphadenopathy, and the results of a genitourinary examination were normal.

Radiographs of the patient's right hip and pelvis were obtained; the results were unremarkable. An ultrasonogram (top) and an MRI scan (bottom) were obtained. What do they show?

What is your diagnosis?

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