Another Scintigraphic "Doughnut" Sign in Bone Scintigraphy in an Uncircumsized Male Patient
A 59-yr-old male patient had undergone a bone scintigraphy as part of the work-up for lung cancer staging. The whole body bone scintigraphy incidentally revealed a ring-like (the doughnut sign) pattern of radiotracer uptake at the soft tissue of medial upper right thigh. After an additional spot views and a specific maneuver of moving the penis away from the thigh, the ring-shaped uptake of radiotracer was determined to be corresponding to the distal portion of the uncircumsized penis, which was found overlying the thigh during the initial whole body imaging. The “doughnut sign” has been encountered during routine reporting of bone scintigraphy with various etiologies from osseous and nonosseous entities. However, to the best our knowledge, a “doughnut sign” seen on skeletal scintigraphy caused by an uncircumsized penis has never been reported in the literature.