Sponge Rubber Revealed Two Years After Penetrating Injury: A Case Report.

The present report illustrates a very rare case report of a foreign body granuloma of the foot associated with a 2-year period of a retained spongeous rubber foreign body after a penetrating injury. Because it appeared almost 2 years after the injury, the history of trauma was minimized, the foreign body had migrated from the plantar to the dorsal side of the foot, and the radiographic appearance resembled a malignant process, it was difficult to rule out the possibility of a malignant tumor. This case shows the weakness of magnetic resonance imaging in detecting spongeous rubber in the body. Also, a bone osteoblastic reaction to the foreign body has very rarely been noted. To the best of our knowledge, just 5 cases have been previously reported. Provided suspicion exists of previous trauma with an embedded foreign body, the differential diagnosis of a bone neoplasm should consider the possibility of a foreign body reaction. Biopsy proved to be the best diagnostic tool.