[The grown-through ring finger].

After performing a right hemicolectomy due to cancer of the colon on a 67-year-old female patient, we detected an ingrown ring on her right ring finger. This had continuously penetrated the proximal phalanx from the flexor side after a trauma 3 years previously. Clinically, a residual flexion function was maintained. In the imaging the bone was found to be eroded, the digital arteries shifted, but the continuity of the deep flexor tendon was preserved.