Traumatic neuroma of the cystic duct in the absence of previous surgery.

An amputation neuroma of the cystic duct was found in the markedly fibrotic gallbladder of an 88-year-old man. Since most visceral amputation neuromas follow surgery and this patient had never undergone surgery, it is postulated that the stimulus for the neural and fibrous proliferation was leakage of bile and/or cholesterol.