Microsurgical Reconstruction Of Skull Base Oncologic Defects Rachel Lentz, MD, Dhivya Srinivasa, MD, Justin Cheng, MD, William Hoffman, MD, Esther Kim, MD UCSF, San Francisco, CA, USA. PURPOSE: Reconstruction following surgical extirpation of skull base tumors remains a challenge to surgeons. Successful reconstructions must effectively separate the CNS from the aerodigestive tract, line the ....