Choutatsu Tsukayama

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The papillary glioneuronal tumor (PGNT) was first reported by Komori et al. as a type of mixed neuronalglial tumor. It is characterized by pseudopapillary structures, composed of hyaline vessels and outsheathing glial cells, and by the proliferation of neurocytic cells admixed with ganglioid and ganglion cells. Although it is most common in young adults, it(More)
Mixed neuronal-glial tumors of the central nervous system display a wide spectrum of differentiation. Among them, the papillary glioneuronal tumor (PGNT) is characterized by pseudopapillary structures composed of astroglial cells covering hyalinized vessels, and by neurocytic, ganglioid and ganglion cells. In addition, a “nonspecific” cell type, not similar(More)
To clarify the neuroendocrine differentiation and CD10 expression in solid-pseudopapillary tumors (SPTs) of the pancreas, we performed immunohistochemical analysis in 19 such tumors, including one solid-pseudopapillary carcinoma (SPC), along with 20 pancreatic neuroendocrine tumors (PNTs), six acinar cell carcinomas (ACCs), and one pancreatoblastoma (PB).(More)
Mesonephric adenocarcinoma (MA) is a rare tumor of the female genital tract, mainly in the cervix and vagina, which is usually associated with mesonephric remnants or mesonephric hyperplasia. In the uterus corpus, MA is as rare as mesonephric structures, and only a few cases have been previously reported. Here, we report a rare case of MA of the uterine(More)
This study concerns the significance of aberrant (nuclear/cytoplasmic) expression of beta-catenin in pancreatoblastoma (PBL). On immunohistochemistry, all seven PBLs examined showed nuclear/cytoplasmic expression of beta-catenin, predominantly in the squamoid corpuscles (SCs). In areas with acinar/ductular differentiation, few tumour cells displayed(More)
Only a few reports have described Cdx2 expression in endometrial lesions of the uterus. Our aim was to determine whether Cdx2 expression is related to squamous differentiation in endometrial lesions. Furthermore, we examined whether there is any correlation between Cdx2 and beta-catenin, a well-known marker of aberrant nuclear accumulation in endometrial(More)
The present study reports five CD8+, CD56+ (natural killer (NK)-like) T-cell lymphomas involving the small intestine without evidence of enteropathy, from Japan. Three were intestinal T-cell lymphoma. The site of origin of the other two was not definitive. Four of five patients underwent emergency operation because of intestinal perforation. The small(More)
Pathological studies were performed on 23 cases of focal nodular hyperplasia (FNH) under the hypothesis that FNH is a hyperplastic lesion caused by abnormal vasculatures of portal tracts within the nodule. For a comparison of the histological features of portal tracts, nodular regenerative hyperplasia (NRH), idiopathic portal hypertension (IPH), chronic(More)
Microsatellite instability (MI) has been detected in certain sporadic cancers as well as in hereditary non-polyposis colorectal cancer (HNPCC). In order to determine the precise clinicopathological characteristics of MI in endometrial cancer, we examined 90 sporadic endometrial cancers (83 endometrioid adenocarcinomas, 3 adenosquamous carcinomas, 3(More)
The purpose of the current study was to examine the use of thin-layer cytologic (TLC) preparation compared to conventional cytologic preparation (CCP) in the normal endometrium (proliferative, secretory, atrophic) and endometrial glandular and stromal breakdown (EGBD). During a 6-month period, we compiled 158 cases by collecting a direct endometrial sample(More)