A 58-year-old man underwent 99mTc-MDP bone scintigraphy to evaluate the cause of diffuse bone pain. The images did not identify the exact cause of his symptoms. However, a “light bulb”–shaped urinary bladder and diffused increased activity in the scrotal region and left thigh were noted, which suggest a mass effect in the pelvis. A CT scan of the pelvis revealed soft tissue compressing the urinary bladder. A diagnosis of recurrent lymphoma was made.