35 years old female with peranal bleeding

History A 35 years old female with known type 1 neurofibromatosis presented with lower gastrointestinal bleeding. At upper and lower endoscopy the source of the bleeding could not be identified. Imaging findings Unenhanced (A), arterial phase (B), and portal venous phase (C) CT scans show a well-defined mass with heterogenous enhancement at the outer aspect…