全文获取类型
收费全文 | 3175篇 |
免费 | 167篇 |
国内免费 | 33篇 |
专业分类
耳鼻咽喉 | 16篇 |
儿科学 | 60篇 |
妇产科学 | 50篇 |
基础医学 | 455篇 |
口腔科学 | 28篇 |
临床医学 | 195篇 |
内科学 | 987篇 |
皮肤病学 | 30篇 |
神经病学 | 277篇 |
特种医学 | 191篇 |
外科学 | 479篇 |
综合类 | 4篇 |
预防医学 | 68篇 |
眼科学 | 14篇 |
药学 | 93篇 |
中国医学 | 3篇 |
肿瘤学 | 425篇 |
出版年
2023年 | 21篇 |
2022年 | 37篇 |
2021年 | 59篇 |
2020年 | 29篇 |
2019年 | 46篇 |
2018年 | 62篇 |
2017年 | 50篇 |
2016年 | 54篇 |
2015年 | 69篇 |
2014年 | 106篇 |
2013年 | 118篇 |
2012年 | 200篇 |
2011年 | 253篇 |
2010年 | 133篇 |
2009年 | 120篇 |
2008年 | 238篇 |
2007年 | 187篇 |
2006年 | 184篇 |
2005年 | 202篇 |
2004年 | 196篇 |
2003年 | 154篇 |
2002年 | 193篇 |
2001年 | 49篇 |
2000年 | 44篇 |
1999年 | 45篇 |
1998年 | 59篇 |
1997年 | 52篇 |
1996年 | 50篇 |
1995年 | 49篇 |
1994年 | 35篇 |
1993年 | 15篇 |
1992年 | 31篇 |
1991年 | 27篇 |
1990年 | 30篇 |
1989年 | 35篇 |
1988年 | 29篇 |
1987年 | 24篇 |
1986年 | 7篇 |
1985年 | 7篇 |
1984年 | 11篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 8篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1974年 | 5篇 |
1972年 | 5篇 |
1968年 | 3篇 |
排序方式: 共有3375条查询结果,搜索用时 15 毫秒
1.
2.
Masanori Murakami Haruhiko Okada Masahiko Nishida Kimikazu Hamano 《Annals of thoracic and cardiovascular surgery》2006,12(3):216-218
A 14-year-old boy had a needle accidentally inserted through his chest wall. Chest X-ray showed a needle-shaped metallic density localized in the cardiac silhouette. An echocardiography indicated the needle had passed through the interventricular septum, and its eye and point had reached the right and left ventricle, respectively. Surgical removal of the needle was performed. The needle could not be observed from the heart surface, and was recognized in a dent 5 mm on the right side from the left anterior descending branch (LAD). The needle was easily removed under extracorporeal circulation, and he was discharged ten days after the operation. 相似文献
3.
Haruhiko Nakamura Norihito Kawasaki Masahiko Taguchi Hajime Kitamura 《Annals of thoracic and cardiovascular surgery》2007,13(4):254-257
A minute small-cell lung cancer measuring 8 x 5 mm was detected and serially imaged by computed tomography for about a year preceding resection. Although this solid nodule showed a short overall doubling time (76 days), the growth curve included an early phase without apparent growth prior to the phase of rapid growth. Accordingly, lung cancer cannot be ruled out when a small nodule (<10 mm) does not enlarge in the first several months of computed tomographic follow-up. 相似文献
4.
5.
We describe an infertile man with normal secondary sexual characteristics and a 45X karyotype. Physical examination showed bilateral soft small testes and the semen contained no sperm. Serum testosterone, estrogen and gonadotropin levels were within normal range. Biopsy of the testis showed germinal aplasia. 相似文献
6.
Osamu Yokota Kuniaki Tsuchiya Yoshimasa Noguchi Hisamasa Akabane Hideki Ishizu Yukinobu Saito Haruhiko Akiyama 《Neuropathology》2007,27(6):539-550
We report a case of a 68‐year‐old right‐handed man with sporadic amyotrophic lateral sclerosis (ALS) and argyrophilic grain disease (AGD) having a 22‐month duration. His initial symptoms were dysarthria and swallowing difficulty at the age of 67. Subsequently bulbar palsy and pyramidal signs developed. His cognitive functions including face recognition, personality, and behavior were not changed compared with that of before the disease onset. However, magnetic resonance imaging disclosed severe right side‐predominant temporal atrophy. The neurological diagnosis was bulbar type ALS. Pathological examination disclosed histological evidence of ALS, including loss of Betz cells and lower motor neurons, corticospinal tract degeneration, and Bunina bodies. In addition, severe neuronal loss in the bilateral temporal cortex with an anterior gradient was found. Ubiquitin‐positive inclusions were encountered in the spinal anterior horn cells and hippocampal dentate gyrus, while few ubiquitin‐positive inclusions were noted in the affected temporal cortex. The amygdala, especially the basolateral nuclear group, was severely affected by neuronal loss with tissue rarefaction. Moderate neuronal loss was encountered in the parahippocampal gyrus, and to a lesser degree, in the ambient gyrus. Unexpectedly, many argyrophilic grains, coiled bodies, tau‐positive bush‐like astrocytes, pretangles, and ballooned neurons were found in the limbic system and temporal cortex. In the hippocampus, selective tau accumulation with minor neurofibrillary changes was observed in CA2 neurons. The present case suggests that (i) ALS and AGD do rarely coexist, and (ii) when ALS patients have severe temporal atrophy, not only ALS with dementia but also concurrent AGD should be considered in the differential diagnosis. 相似文献
7.
Y. Suzuki S. Ehara H. Shiraishi J. Nishida G. Murooka Y. Tamakawa 《Skeletal radiology》1997,26(2):128-130
The case of a 14-year-old girl with rhabdomyosarcoma of the right foot is reported. Plain radiography showed a large nonspecific
soft tissue tumor between the metatarsals with bowing of the metatarsals away from the mass. MR imaging showed a large soft
tissue mass involving the metatarsals. The findings were conflicting, because the tumor had an infiltrative soft tissue mass
and bowing of the metatarsals more suggestive of slow expansive growth. Bowing of short tubular bones may be a process similar
to cortical saucerization, which is typically seen in Ewing’s sarcoma, and it can be one of the findings of high grade neoplasms,
such as embryonal rhabdomyosarcoma. 相似文献
8.
A 71-year-old man with left periorbital pain and diplopia was hospitalized for evaluation and treatment. He had a past history of untreated diabetes mellitus. Shortly after admission, the patient experienced rapid onset of visual loss in the left eye. MRI and CT showed a lesion expanding from the left orbital apex to the left pterygopalatine fossa. Invasive aspergillosis was diagnosed by open biopsy of intrasinus mucosa via the left maxillary sinus. The patient was treated with voriconazole, an antifungal agent, and marked improvements in left periorbital pain and eye movement were subsequently obtained, although visual acuity was not recovered. This is the first report documenting the clinical utility of voriconazole for sino-orbital invasive aspergillosis. 相似文献
9.
Invasion of the skull base by carcinomas: histopathologically evidenced findings with CT and MRI 总被引:3,自引:0,他引:3
Haruhiko Ishida Mitsuhiro Mohri Mutsuo Amatsu 《European archives of oto-rhino-laryngology》2002,259(10):535-539
The depth and extent of the invasion of the skull base by a tumor are the most critical information for successful en bloc resection of the tumor. The only means available for the evaluation of these factors are CT or MRI images. In order to clarify the ability of these imaging modes to delineate the invasion of the skull base, preoperative images of ten patients who underwent en bloc resection of skull base tumors at Kobe University Hospital were compared with the histopathological findings of the resected specimens. CT proved to be superior to MRI for evaluating bone destruction of the skull base. On the other hand, MRI provided more useful information about intracranial invasion than CT. As a hypertrophic linear shadow on Gd-enhanced MRI represented dural invasion or thickened dura mater adjacent to the tumor, this technique should be taken into consideration to determine the dural resection. We concluded that preoperative evaluation of the depth of skull base invasion by both CT and Gd-enhanced MRI is essential for planning complete tumor resection. 相似文献
10.
Fluid-fluid levels in cavernous hemangioma of soft tissue 总被引:3,自引:0,他引:3
Shigeru Ehara M.D. Miyuki Sone Yoshiharu Tamakawa Jun Nishida Masataka Abe Junichi Hachiya 《Skeletal radiology》1994,23(2):107-109
Five cases of cavernous hemangioma with fluid-fluid levels on magnetic resonance imaging and/or computed tomography are reported. The signal characteristics were those of blood and histological analysis of the fluid-fluid levels showed that they were blood-filled cavities in the tumor. Although this finding itself is not specific, it may help in confirming the diagnosis of cavernous hemangioma. 相似文献