Hiroshi Nishioka

Learn More
To elucidate histological changes in the pituitary gland and adenomas following radiotherapy, two irradiated pituitary glands and seven irradiated non-functioning adenomas were studied. The latter included four cases with conventional radiation (CR) and three cases with radiosurgery: two with gamma knife radiosurgery (GKR) and one with stereotactic(More)
OBJECTIVE To analyze our experience with transsphenoidal surgery (TSS) in patients with Cushing disease (CD) with no visible adenoma on magnetic resonance imaging (MRI). METHODS Between January 1988 and October 2010, 183 patients with CD underwent TSS at Toranomon Hospital. We retrospectively analyzed data in 18 patients without visible adenomas on MRI(More)
The expression by non-functioning adenomas (NFoma) of somatostatin receptor (SSTR) subtypes and estrogen receptor (ERα) is poorly understood. Consequently, the mRNAs of SSTR subtypes (SSTR) 1, 2, 3, and 5, dopamine receptor (D2R), and ERα were measured by real-time quantitative RT-PCR in 59 NFomas and 50 functioning adenomas; the latter included 30(More)
OBJECTIVE With conventional MRI and single-photon emission computed tomography (SPECT), accurate diagnosis and precise classification of cerebellar atrophy are often difficult. The objective was to verify the utility of MRI voxel-based morphometry (VBM) in combination with SPECT using easy Z-score imaging (eZIS) for diagnosing and classifying cerebellar(More)
INTRODUCTION The study aims to describe the endocrinological and magnetic resonance imaging (MRI) features of the rarely reported xanthogranulomas associated with pituitary adenoma. METHODS Of 231 consecutive pituitary adenomas treated surgically, those with xanthogranulomatous reaction on histology were reviewed. RESULTS Five patients (2.2%) had an(More)
Exocytosis proteins play an important role in the secretory activities of anterior pituitary cells and adenoma cells. An immunohistochemical study was conducted to elucidate the functional significance of these proteins in growth hormone (GH)-producing adenomas. We studied 40 GH-producing adenomas, 10 prolactinomas, and 10 clinically nonfunctioning (NF)(More)
On histology, IgG4-related hypophysitis is essentially similar to lymphocytic hypophysitis besides massive IgG4-positive plasmacyte infiltration. This immunohistochemical study was performed to investigate the presence of IgG4-positive plasmacytes in 14 various inflammatory lesions. Five cases of lymphocytic hypophysitis and a case of granulomatous(More)
The aim of this study was to clarify the relationship between the histological features of GH-producing adenomas surgically resected at the Toranomon Hospital and the clinical features of the patients. Histological examinations, including immunohistochemistry for anterior pituitary hormones and cytokeratin (CK), were performed on 242 consecutively excised(More)
BACKGROUND In comparison to prolactinomas in women, those in men are usually large tumors and have been suggested to have a higher proliferation activity. To elucidate the reason for the predominance of large tumors in men, we investigated the gender-related difference of prolactinomas including growth potential. METHODS We conducted a retrospective study(More)
BACKGROUND Inflammatory pseudotumor primarily affecting the CNS is an extremely rare lesion with uncertain etiology in most cases. CASE DESCRIPTION A 67-year-old man developed involuntary movement disorder of the left upper extremity. On MRI, a solid homogeneously-enhanced tumor was noted in the right lateral ventricle adjacent to the thalamus. He had(More)