A 20-year-old white homosexual man presented to the emergency room complaining of rectal pain. A well-nourished, well-developed man without signs of intoxication was admitted in no apparent distress. Digital examination of the rectum revealed a stony hard mass. Abdominal plain films showed a vertically oriented, low-lying radiopaque object in the rectum (Figure 1). A spherical radiolucency was noted in the upper pole of the mass.

Upon further questioning, the patient said that approximately 4 h earlier he and his boyfriend had been "fooling around." After stirring a batch of concrete mix, the patient laid on his back with his feet against the wall at a 45% angle while his boyfriend poured the mixture through a funnel into his rectum. After the concrete mass hardened, it became so painful that he sought medical care.