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Chronic expanding pituitary hematoma with calcification resulting from pituitary adenoma: illustrative case

Fugen Takagi, Ryokichi Yagi, Takuya Kanemitsu, Yuichiro Tsuji, Naokado Ikeda, Naosuke Nonoguchi, Motomasa Furuse, Shinji Kawabata, Toshihiro Takami, and Masahiko Wanibuchi

consistent with those above. The underlying mechanism is supposedly similar to that of a chronic subdural hematoma, and the pathophysiology resulting in hematoma enlargement, a contemplative cycle of hemorrhage, coagulation, fibrinolysis, and rebleeding from the neovascular outer membrane. In contrast to acute-onset PA, this patient showed visual deterioration due to slow cystic enlargement, and a serous dark reservoir was observed within the cyst. Combined pathological examination resulted in diagnosis of CEEH after pituitary stroke associated with pituitary adenoma. In