“…A rare cause is bronchopleurodurosubarachnoid fistula, an unusual and difficult clinical problem with limited case reports, commonly related to trauma or posterolateral thoracotomies [1], [2], [3], [4], [5], [6], [7], [8], [9], [10]. We present a case of symptomatic pneumocephalus and pneumorrhachis caused by spontaneous nonsurgical, nontraumatic bronchopleurodurosubarachnoid fistula from a Pancoast tumor invading the spine after palliative chemoradiation.…”