首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1137篇
  免费   60篇
  国内免费   41篇
耳鼻咽喉   69篇
儿科学   101篇
妇产科学   25篇
基础医学   36篇
临床医学   164篇
内科学   216篇
皮肤病学   2篇
神经病学   3篇
特种医学   73篇
外科学   386篇
综合类   100篇
预防医学   21篇
眼科学   1篇
药学   21篇
  1篇
中国医学   6篇
肿瘤学   13篇
  2023年   27篇
  2022年   31篇
  2021年   46篇
  2020年   48篇
  2019年   37篇
  2018年   38篇
  2017年   36篇
  2016年   39篇
  2015年   38篇
  2014年   74篇
  2013年   70篇
  2012年   38篇
  2011年   61篇
  2010年   42篇
  2009年   52篇
  2008年   56篇
  2007年   55篇
  2006年   46篇
  2005年   39篇
  2004年   40篇
  2003年   37篇
  2002年   35篇
  2001年   29篇
  2000年   18篇
  1999年   20篇
  1998年   14篇
  1997年   9篇
  1996年   16篇
  1995年   16篇
  1994年   12篇
  1993年   15篇
  1992年   8篇
  1991年   10篇
  1990年   8篇
  1989年   10篇
  1988年   5篇
  1987年   5篇
  1986年   4篇
  1985年   3篇
  1984年   10篇
  1983年   2篇
  1982年   14篇
  1981年   6篇
  1980年   6篇
  1979年   4篇
  1978年   3篇
  1977年   4篇
  1973年   1篇
  1972年   1篇
排序方式: 共有1238条查询结果,搜索用时 31 毫秒
1.
Intussusception is a very rare cause of intestinal obstruction in neonates. It is of extremely rare occurrence among premature neonates. We present a case of 11-day-old premature neonate who presented with abdominal distension, intolerance to feeds, vomiting, significant bilious aspirate and bleeding per rectum. The initial diagnosis of necrotizing enterocolitis (NEC) led to a delay in the diagnosis. On exploratory laparotomy, it turned out to be a case of ileo-colic intussusception with Meckel''s diverticulum as a lead point. This site of intussusception (ileo-colic) and presence of a lead point among premature neonate is of exceedingly rare occurrence and very few such cases have been reported.In this article, the published work about clinical features and management on intussusceptions in premature neonates has been reviewed. The authors intend to highlight the difficulty in distinguishing the NEC and intussusception. Subtle clinical and radiological features which can help in differentiating the two conditions have been emphasized. This can avoid the delay in diagnosis and management which can prove critical. High index of suspicion with timely intervention is the key for optimizing outcome. A diagnosis of intussusception should always be considered in any preterm infant with suspected NEC.  相似文献   
2.
We present two cases in which complication of a Meckel's diverticulum were dealt with, and in one case diagnosed using the laparoscope. One was a large bleeding diverticulum containing ectopic gastric mucosa, with the diagnosis suggested preoperatively, confirmed laparoscopically, and the pathology resected extracorporeally. The second was a partial intermittent small-bowel obstruction due to torsion around the mesodiverticular band, diagnosed and resected via the laparoscope. The literature of Meckel's diverticula and complications is reviewed, with open and laparoscopic treatment options. Although uncommon, many cases of Meckel's diverticulum may be quite suitable for laparoscopic diagnosis and treatment.  相似文献   
3.
We present a 70‐year‐old man who had two episodes of melena during the preceding 8‐year period. He had a Dieulafoy‐like lesion in a diverticulum in the third portion of the duodenum. While emergency endoscopy revealed neither apparent blood nor clots around the diverticular orifice, there was a non‐bleeding vessel in the fundus of the diverticulum. The vessel ceased bleeding after argon plasma coagulation and, since then, the patient has not experienced bleeding. In cases of gastrointestinal bleeding of obscure origin, duodenal diverticulum should be considered as a possible source of bleeding, even when endoscopy discloses no apparent bleeding.  相似文献   
4.
Background Although there have been reports dealing with ventricular diverticulum (VD) analyzed by cisternography and computed tomography (CT), those focusing on magnetic resonance imaging (MRI) or neuroendoscopic findings are rare. Case report We present a case of noncommunicating hydrocephalus caused by aqueductal stenosis with cystic lesion located in supracerebellar region. Third ventriculostomy was performed on this case. The conventional CT and MRI were compatible with usual VD, but neuroendoscopic examination suggested otherwise. The endoscopic view inside of the cystic lesion demonstrated passing veins and no membrane. We diagnosed this cystic lesion as a unique subtype of advanced VD mimicking spontaneous ventriculostomy. Endoscopic observation of the cyst was very useful for accurate diagnosis and safe treatment.  相似文献   
5.
Carcinoma arising in a diverticulum of sigmoid colon   总被引:1,自引:0,他引:1  
  相似文献   
6.
A 49-year-old woman was referred to our hospital with complaints of epigastric colicky pain and high fever. Abdominal computed tomography and ultrasonography showed a solid tumor in the lower abdomen. Laparotomy revealed a neoplastic mass arising in Meckel's diverticulum; therefore, a segment of the ileum, including the tumor-possessing diverticulum, was resected with a lymph node dissection. A histologic examination confirmed the lesion to be leiomyosarcoma. In the English literature, 59 cases of leiomyosarcoma in Meckel's diverticulum were reported from 1941 to 1994. The majority of patients were in their 4th decade of life, with both sexes equally affected. The most frequent symptoms associated with this disease were abdominal pain with nausea, vomiting, and melena. The majority were larger than egg-size. Although Meckel's diverticulum is difficult to diagnose preoperatively, mesenteric arteriography may at times prove useful. The standard management of this particular tumor is wide segmental resection, including the tumor and diverticulum with lymph node dissection.  相似文献   
7.
Ninety-two children underwent meckelectomy in our department over the 10-year period 1981–1990. All histologic speciments of Meckel's diverticula were studied, most of them retrospectively, for evidence of active inflammation or ulceration in any ectopic gastric mucosa present and specifically searching for Helicobacter pylori (HP). Thirty-eight (group A) were excised as being responsible for the main clinical symptoms while 54 (group B) were resected incidentally. Ectopic gastric mucosa was found in 19 cases, 18 in the symptomatic group and 1 in the incidental group. In the 18 cases belonging to group A histologic findings indicating gastritis due to HP were present. Combined operative and laboratory findings in all 92 cases indicated that HP colonizes gastric mucosa electively and leads to infection, which seems to be responsible for the clinical symptoms of meckelitis.Presented at the 15th Annual International Meeting of Greek Association of Pediatric Surgeons, Porto Hydra, Greece, 27–30 September 1990  相似文献   
8.
Ductus arteriosus aneurysm is rare in adults and preoperative diagnosis has not been usually done. We report 2 cases of adult type ductus arteriosus aneurysm. In both cases, 3D computed tomographic scanning showed a saccular aneurysm originating from the distal aortic arch toward the left pulmonary artery, which had a notching in the orifice of the aortic side. They were successfully treated surgically though one was a ruptured aneurysm to the left pulmonary artery. In these cases, 3D-CT scan was of great value in the preoperative diagnosis of the ductus arteriosus aneurysm.  相似文献   
9.
Meckel's diverticulum, which is a remnant of the omphalomesenteric or vitelline duct, is the most common congenital abnormality of the gastrointestinal system. Urachal abnormalities, resulting from anomalous urogenital development, are not observed frequently and case reports are mainly represented in literature. The presence of these two congenital anomalies together is a very rare pathology. Complications arising from a Meckel's diverticulum or urachal remnant may clinically mimic acute appendicitis and other surgical pathologies. We report on a patient who underwent surgery for acute appendicitis when it was discovered that the symptoms were produced by a perforated Meckel's diverticulitis. In the course of the surgery, a urachal remnant was found to coexist with the diverticulum.  相似文献   
10.
空回肠结肠多发性憩室的临床X线诊断   总被引:1,自引:0,他引:1  
目的 探索空回肠结肠多发性憩室的临床X线表现,评价消化道造影的诊断价值。方法 对18例患者的临床及X线表现进行了回顾性分析。结果 空肠多发性憩室12例,其中并发十二指肠多发性憩室10例,2例合并回肠多发性憩室。结肠多发性憩室6例,1例并发回肠多发性憩室及结肠癌。结论 空肠多发性憩室多并发于十二指肠多发性憩室,近-中段是好发部位。结肠多发性憩室多见于右半结肠,可有结肠变形。未见独立发生的回肠多发性憩室。钡餐造影能够确诊,小肠灌钡及钡灌肛可提高发现率。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号