The excessive interstitial lung fluid traverses the visceral pleura and accumulates in the pleural space. It is used in pleurodesis (fusion of the pleura because of incessant pleural effusions). Thoracic endometriosis occurs when endometrial tissue implants in the lungs or pleura. The parietal pleura is supplied by the intercostal nerves and the phrenic nerve. Intrapulmonary sequestration occurs within the visceral pleura of normal lung tissue. The costal pleura is innervated by the intercostal nerves. Absorption occurs into lymphatic vessels at the level of the diaphragmatic pleura. This involves mechanically irritating the parietal pleura, often with a rough pad. It innervates the bronchial tree and the visceral pleura. Normally, the space between the visceral pleura and the parietal pleura cannot be seen. Violent coughing can cause the pleura to rupture, leading to a pneumothorax. Each lung is divided into lobes by the infoldings of the pleura as fissures. The disease's lesions consist of large, mature-appearing B-cells infiltrating the lung's pleura and nearby tissues. However, cases of metastases to bone, pleura, lungs and retroperitoneum have been seen. Terga are separated from each other and from the adjacent sterna or pleura by membranes.