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排序方式: 共有47条查询结果,搜索用时 15 毫秒
1.
Iichiro Osawa Eito Kozawa Yuya Yamamoto Sayuri Tanaka Taira Shiratori Akane Kaizu Kaiji Inoue Mamoru Niitsu 《Magnetic resonance in medical sciences》2022,21(3):469
Purpose: The purpose of the present study was to evaluate contrast enhancement of the infundibular recess in the normal state using heavily T2-weighted 3D fluid-attenuated inversion recovery (FLAIR) (HT2-FLAIR).Methods: Twenty-six patients were retrospectively recruited. We subjectively assessed overall contrast enhancement of the infundibular recess between postcontrast, 4-hour (4-h) delayed postcontrast, and precontrast HT2-FLAIR images. We also objectively conducted chronological and spatial comparisons by measuring the signal intensity (SI) ratio (SIR). Chronological comparisons were performed by comparing SI of the infundibular recess/SI of the midbrain (SIRIR-MB). Spatial comparisons were conducted by comparing SI on postcontrast HT2-FLAIR/SI on precontrast HT2-FLAIR (SIRPost-Pre) of the infundibular recess with that of other cerebrospinal fluid (CSF) spaces, including the superior part of the third ventricle, lateral ventricles, fourth ventricle, and interpeduncular cistern.Results: In the subjective analysis, all cases showed contrast enhancement of the infundibular recess on both postcontrast and 4-h delayed postcontrast HT2-FLAIR, and showed weaker contrast enhancement of the infundibular recess on 4-h delayed postcontrast HT2-FLAIR than on postcontrast HT2-FLAIR. In the objective analysis, SIRIR-MB was the highest on postcontrast images, followed by 4-h delayed postcontrast images. SIRPost-Pre was significantly higher in the infundibular recess than in the other CSF spaces.Conclusion: The present results demonstrated that the infundibular recess was enhanced on HT2-FLAIR after an intravenous gadolinium injection. The infundibular recess may be a potential source of the leakage of intravenously administered gadolinium into the CSF. 相似文献
2.
Extraocular sebaceous carcinoma accompanied by invasive squamous cell carcinoma: The first case report and consideration of histogenesis 下载免费PDF全文
Toshiaki Kogame Shuichi Ohe Fumikazu Yamazaki Hiroyuki Okamoto Takahiro Kiyohara 《The Journal of dermatology》2018,45(4):501-504
A 61‐year‐old man presented with a dome‐shaped nodule, 1.2 cm in size, with a central crater covered by keratinous material near the left lateral malleolus. Histological findings demonstrated a basophilic circular cone in the center, surrounded and sharply demarcated by a broad eosinophilic area. The central conical mass was composed mainly of atypical basaloid cells intermingled with scattered atypical sebaceous cells with scalloped nuclei and microvesicular cytoplasms, suggesting sebaceous carcinoma. The peripheral area consisted of atypical keratinizing squamoid cells without sebaceous cells, suggesting invasive squamous cell carcinoma. Atypical sebaceous cells were positive for adipophilin. Atypical basaloid cells were positive for 34βE12 and CAM5.2. Peripheral squamoid cells were positive for 34βB4 and 34βE12 throughout, and were positive for LHP1 in the superficial layer. We herein describe the first case of extraocular sebaceous carcinoma accompanied by invasive squamous cell carcinoma, which might have arisen from biphasic differentiation of cancer stem cells. 相似文献
3.
Natural course of keratoacanthoma and related lesions after partial biopsy: Clinical analysis of 66 lesions 下载免费PDF全文
There is some confusion regarding the classification of keratoacanthoma (KA) and related lesions that have crateriform architecture. We examined the clinical courses of 66 KA lesions and related lesions after a partial biopsy to clarify the nosological concept of KA. We histopathologically classified these lesions into five types: (i) KA at various stages (53 lesions); (ii) KA‐like squamous cell carcinoma (SCC) (3 lesions); (iii) KA with malignant transformation (3 lesions); (iv) infundibular SCC (5 lesions); and (v) crateriform SCC arising from solar keratosis (2 lesions). We analyzed the clinical course in each group. The regression rate of KA was 98.1% and that of KA‐like SCC/KA with malignant transformation was 33.3%. No regression was observed in either infundibular SCC or crateriform SCC arising from solar keratosis. Thus, KA is a distinct entity that should be distinguished from other types of SCC with crateriform architecture based on the high frequency of regression. The regression rate of 33.3% in KA‐like SCC/KA with malignant transformation indicated that KA lesions with an SCC component still have the potential for regression. However, this result also indicated that KA is biologically unstable, and some KA tend to evolve into conventional SCC with a gradual loss of the capacity for the spontaneous regression. Infundibular SCC and crateriform SCC arising from solar keratosis are fundamentally different from KA, not only according to the histopathological findings but also based on the biological properties. 相似文献
4.
Thomas Bakken Seong Wook Kang Sunantha Kosonsiriluk Takehito Kuwayama Yupaporn Chaiseha Mohamed E. El Halawani 《Acta histochemica》2014
In the turkey, exogenous serotonin (5-hydroxytryptamine, 5-HT) increases prolactin (PRL) secretion by acting through the dopaminergic (DAergic) system. In the present study, infusion of the 5-HT2C receptor agonist, (R)(−)-DOI hydrochloride (DOI), into the third ventricle stimulates PRL secretion, whereas the 5-HT1A receptor agonist, (+/−)-8-OH-DPAT hydrobromide (DPAT), inhibits PRL secretion. Using the immediate-early gene, c-fos, as an indicator of neuronal activity, in situ hybridization histochemistry showed preferential c-fos co-localization within tyrosine hydroxylase immunoreactive neurons (the rate limiting enzyme in DA synthesis) in the areas of the nucleus preopticus medialis (POM) and the nucleus premammillaris (PMM), in response to DPAT and DOI, respectively. To clarify the involvement of 5-HT1A and 5-HT2C receptors in PRL regulation, their mRNA expression was determined on hypothalamic tissue sections from birds in different reproductive stages. A significant difference in 5-HT1A receptor was observed, with the POM of hypoprolactinemic short day and photorefractory birds showing the highest expression. 5-HT2C receptors mRNA did not change during the reproductive cycle. The data presented support the notion that DA neurons in the PMM and POM mediate the stimulatory and inhibitory effects of 5-HT, respectively, on PRL secretion and the 5-HTergic system can both stimulate and inhibit PRL secretion. 相似文献
5.
S. Debaize M. Gebhart T. Fourrez I. Rahier J.M. Baillon 《Acta chirurgica Belgica》2013,113(3):196-198
Epidermal cysts are commonly encountered in surgical practice. Malignant degeneration of epidermal sebaceous cyst is uncommon. The authors report the case of a 38-year Filipino woman presenting with a voluminous sebaceous cyst of the left buttock. Ultrasonography and computer tomography were made preoperatively without any hint of eventual malignant degeneration. Marginal excision was performed with direct closure of the skin. The histological examination revealed epidermal sebaceous cyst with squamous cell carcinoma in situ, which is a quite rare, but well known complication occurring in sebaceous cysts. 相似文献
6.
We report a 71-year-old Japanese female with a dilated pore in the form of a nodule above her right eyebrow. Histologic examination revealed a flask-shaped, keratinous cystic structure that was continuous with the surface epidermis and had numerous elongated rete ridges in the lower portion. An immunohistochemical study using a panel of monoclonal antibodies against cytokeratins (CKs) and involucrin detected CK1 and CK10 in the suprabasal cells of the cystic structure. CK8 and CK19 expression was observed in the outermost layer of some elongated rete ridges; it was composed of pallisading columnar cells. Most parts of the outermost layer of the cystic structure stained positively with AE1 antibody. From these immunohistochemical findings, we speculated that the dilated pore in our case was an isolated clinical entity is a follicular tumor differentiating mainly toward the infundibulum and partly toward the isthmus. 相似文献
7.
颈内动脉-后交通动脉分叉部动脉瘤与动脉圆锥周围血管的形态学差异研究 总被引:1,自引:0,他引:1
目的分析颈内动脉-后交通动脉(ICA—PComA)分叉部动脉瘤与动脉圆锥周围血管的形态学特点。方法以22个ICA—PComA动脉瘤(动脉瘤组)与20个动脉圆锥(动脉圆锥组)为研究对象,通过3D—DSA对颈内动脉交通段直径(Dica)、后交通动脉起始部直径(Dpcom)、颈内动脉与后交通动脉起始部夹角角度(Apcom)及颈内动脉眼段-床突段转折处角度(Aica)等进行测量。采用两独立样本t检验及Logistic回归对结果进行统计分析;对与动脉瘤发生具有相关性的参数进行受试者工作特线曲线(ROC)分析。结果两组Dpcom、Aica和Apcom差异有统计学意义(P〈0.05);Apcom减小导致动脉瘤发生概率增加。Apcom的ROC曲线下面积为0.913,最佳诊断界值为52.25°。结论Apcom对ICA-PComA动脉瘤与动脉圆锥的鉴别及对动脉瘤的预测具有重要参考价值。 相似文献
8.
9.
During a recent volunteer medical mission to the Dominican Republic, we administered anesthesia to a child with severe pulmonary valvular stenosis and suprasystemic right ventricular pressure. This patient underwent a balloon pulmonary valvuloplasty but then developed worsening right ventricular outflow tract obstruction that required immediate therapy to prevent a low cardiac output state. As the development of hyperdynamic right ventricular outflow tract obstruction cannot be predicted, we emphasize the need for preemptive hydration and beta-blockade therapy prior to balloon dilatation. 相似文献
10.
Antonio-J. Jimnez Juan-Miguel Mancera Jos-Manuel Prez-Fígares Pedro Fernndez-Llebrez 《The Journal of comparative neurology》1994,349(1):73-84
Galanin is a brain-gut peptide present in the central nervous system of fish, amphibians, birds, and mammals. For comparative studies among vertebrates, the distribution of galanin in the brain of reptiles has been investigated. We studied the localization of galanin-like-immunoreactive perikarya and nerve fibers in the brain of the turtle Mauremys caspica by using an antiserum against porcine galanin. In the telencephalon, few immunoreactive perikarya were seen in the amygdaloid complex. The diencephalon contained the majority of the immunoreactive perikarya present in the lamina terminalis, nucleus periventricularis anterior, lateral preoptic area, nuclei hypothalamicus ventromedialis and posterior, nucleus basalis of the anterior commissure, and nucleus ventralis tuberis. Many immunoreactive cells, especially in the infundibulum, contacted the cerebrospinal fluid by an apical process. In the rhomben-cephalon, immunopositive perikarya were restricted to a few cells in the nucleus tractus solitari. In the mesencephalon, they were absent. Immunoreactive nerve fibers were present in all regions containing labeled perikarya and in (1) telencephalon: septum, nucleus fasciculi diagonalis Brocae; (2) diencephalon: nucleus paraventricularis, nucleus supraopticus, nucleus suprachiasmaticus, subventricular grey, nucleus of the paraventricular organ, nucleus mamillaris, infundibular decussation, outer layer of the median eminence, posterior commissure and subcommissural organ region, habenula, nuclei dorsomedialis anterior, and dorsolateralis anterior of the thalamus; and (3) mesencephalon and rhombencephalon: stratum griseum periventriculare, stratum fibrosum periventriculare, laminar nucleus of the torus semicircularis, periventricular grey, nucleus interpeduncularis, nucleus ruber, substantia nigra, locus coeruleus, raphe nuclei, nuclei of the reticular formation, nucleus motorius nervi trigemini, cochlear and vestibular area, and nucleus spinalis nerve trigemini. Our results suggest that galanin may have hypophysiotropic and central roles in the turtle Mauremys caspica. © 1994 Wiley-Liss, Inc. 相似文献