Subarachnoid pleural fistula (SPF) is an aberrant communication between the pleural cavity and subarachnoid space. resulting in uncontrolled cerebrospinal fluid drainage. The negative pressure of the pleural cavity creates a continuous suctioning effect. thereby impeding the spontaneous closure of these fistulas. https://www.roneverhart.com/Yamaha-C115V-2-Way-Loudspeaker-System-p30552/