[A case of metastatic tumor of the pituitary gland presenting as a subarachnoid hemorrhage].

We reported the case of a 55-year-old man with metastatic tumor of the pituitary gland who suffered from symptomatic pituitary apoplexy with subarachnoid hemorrhage. The patient, who had sigmoid colon carcinoma and left parietal metastatic brain tumor, developed severe headache and decrease of right visual acuity. CT showed a pituitary mass with subarachnoid hemorrhage. Transsphenoidal surgery was performed after replacement therapy with corticosteroids. Histological examination revealed metastasis of adenocarcinoma. Pituitary apoplexy is an unusual manifestation of metastatic pituitary tumor. The case of metastatic tumor of the pituitary gland presenting as subarachnoid hemorrhage such as this case is especial rare.