钝性膈肌破裂的螺旋CT诊断

钝性膈肌破裂主要发生于胸、腹部钝挫伤的病人.该病临床症状隐匿,CT表现复杂多变,误、漏诊率发生较高.介绍钝性膈肌破裂的CT检查方法、表现及其含义,评价各种CT征象在钝性膈肌破裂诊断中的作用.     

钝性膈肌破裂的螺旋CT诊断

钝性膈肌破裂主要发生于胸、腹部钝挫伤的病人.该病临床症状隐匿,CT表现复杂多变,误、漏诊率发生较高.介绍钝性膈肌破裂的CT检查方法、表现及其含义,评价各种CT征象在钝性膈肌破裂诊断中的作用.     

闭合性腹部外伤的CT诊断价值（附85例分析）

目的:评价CT检查对闭合性腹部外伤的诊断价值.材料和方法:回顾性分析85例闭合性腹部外伤的CT表现.结果:闭合性腹部外伤以实质性脏器为多,脾损伤45例、肾损伤20例、肝损伤12例、复合伤 7例、外伤性膈疝1例.其中外伤后肝癌破裂出血1例.平扫加增强45 例.结论:CT扫描可对闭合性腹部外伤作出正确诊断,并为临床治疗提供重要信息.     

腹部外伤的CT诊断(附387例分析)

目的 :评价 CT检查对腹部外伤的诊断价值。方法 :对 387例腹部外伤病人进行 CT检查并作了回顾性分析。结果 :387例腹部外伤中 CT检出腹部脏器损伤 2 0 7例 (检出率 53.5% )其中脾破裂 1 2 5例 ,肾破裂 38例 ,复合损伤 34例 ,肝破裂 1 0例 ,腹腔积血 1 46例 ,腹膜后血肿 48例 ;腹腔大量积血与脾脏缩小提示实质器官破裂。结论 :CT对腹部外伤的正确诊断和临床治疗可提供重要信息     

12例创伤性膈疝的诊断与治疗

总结12例创伤性膈疝的诊断和治疗的经验,认为CT片“内脏依靠征”对诊断有重大意义,无严重合并伤并及时诊治者预后良好。     

螺旋CT诊断钝性肠管和肠系膜损伤的临床价值

目的 探讨螺旋CT对急性钝性大小肠和肠系膜损伤的诊断价值.方法 2004-02-2008-05, 急性腹部钝性损伤螺旋CT扫描300例.CT诊断大小肠或/和肠系膜损伤18例,其中16例剖腹手术.2例临床随访.CT表现与手术探查对照分析.结果 肠管和系膜损伤的CT各种表现的诊断准确率分别为:肠壁增厚63%,肠壁破裂100%,肠系膜血肿71%,肠系膜血管中断100%,系膜束带征56%及气腹或肠壁或系膜间积气50%.结论 综合分析肠和肠系膜损伤的直接和间接CT征象,可以较准确地评估肠和肠系膜损伤的程度及损伤部位.     

钝性腹外伤并下腔静脉塌陷征的CT征象及其临床价值

目的:分析钝性腹外伤并下腔静脉塌陷征的CT征象,探讨这些征象的临床价值。方法:回顾性搜集我院诊治的23例有钝性腹外伤病史并出现下腔静脉塌陷征的患者,分析其临床表现和CT征象。结果:23例患者有2例死亡。腹部增强CT发现肝脾强化程度减弱16例,“休克肠”9例,肾延迟强化7例,肾上腺强化延迟6例,肾上腺强化增强3例,对比剂外渗2例。结论:下腔静脉塌陷征可能是早期预测血流动力学失稳和需要进一步手术干预的重要指标;同时,认识其伴发CT征象对判断失血性休克具有一定提示作用,对治疗和预后有重要意义。     

创伤性膈疝的诊断（附2例报告）

创伤性膈疝系外伤后引起膈肌破裂，导致腹腔脏器疝入胸腔。我院近期收治2例创伤性膈疝患者，报道如下： 病例资料例1：男33岁。因车祸外伤住院，感左侧胸部及左腹部剧烈疼痛伴气短，急诊胸片可见左肺下野大的半圆形透亮区伴有气液平面，左侧膈肌显示不清，考虑左侧外伤性膈疝。CT诊断为左侧膈疝。急诊手术，术中所见胸腔内有少量血性液体，胃位于胸腔内，食管裂孔处见膈肌有长约8cm裂口，将胃还纳腹腔，缝合膈肌，脾破裂切除。术后恢复良好。     

多层螺旋CT诊断穿通性膈肌损伤

本研究的目的是评价多层螺旋CT（MDCT）发现穿通性外伤后膈肌损伤的敏感性和特异性。对136例穿通性躯干外伤痕迹接近膈肌的病人进行了术前的胸部和腹部CT检查,放射科医生在不知手术所见的情况下对CT影像进行了复习,并注意到贯通性膈肌损伤的相关征象。这些征象和手术诊断相关,并计算征象帮助诊断的敏感性和特异性。     

外伤性脾破裂的CT诊断

目的：评价CT在外伤性脾破裂诊断中的价值。材料与方法：本文报告48例外伤性脾破裂，其中42例经手术证实。48例均做CT平扫，4例加作增强扫描，男34例，女14例。以30—49岁最多见。结果：CT表现以脾实质性不规则不均匀性低密度影最多见。运用窄窗及图像放大技术能使损伤更清晰。可同时发现肝、肾、肋骨、脊椎、横膈等多发性损伤。结论：本组CT诊断脾破裂无1例假阳性。     

The "dependent viscera" sign in CT diagnosis of blunt traumatic diaphragmatic rupture

OBJECTIVE: The objective of our study was to describe the "dependent viscera" sign and determine its usefulness at CT in the diagnosis of diaphragmatic rupture after blunt abdominal trauma. MATERIALS AND METHODS: The study sample consisted of 28 consecutive patients (19 men, nine women) between 17 and 74 years old (mean age, 31 years) who had undergone abdominal CT and subsequent emergency laparotomy after a blunt trauma. Ten patients had a diaphragmatic rupture (six, right-sided; four, left-sided) at laparotomy. An experienced radiologist unaware of the surgical findings retrospectively reviewed the CT scans, and then a second radiologist reviewed the scans to provide interobserver agreement. Note was made of discontinuity of the diaphragm, intrathoracic herniation of abdominal contents, and waistlike constriction of bowel (the collar sign). Also noted was whether the upper one third of the liver abutted the posterior right ribs or whether the bowel or stomach lay in contact with the posterior left ribs. Either of these findings was termed the "dependent viscera" sign. The radiologists' detection rate of diaphragmatic rupture on the CT scans via observance of the dependent viscera sign was determined. Interobserver agreement was assessed using Cohen's kappa statistic. RESULTS: The dependent viscera sign was observed on the CT scans of 100% of the patients with a left-sided diaphragmatic rupture and of 83% of the patients with right-sided diaphragmatic rupture. Both observers missed one case of right-sided diaphragmatic rupture. The radiologists' overall rate of detecting diaphragmatic rupture was 90% using the dependent viscera sign. We found excellent interobserver agreement (kappa = 1) for detection of the dependent viscera sign and for the diagnosis of diaphragmatic tear on CT scans. CONCLUSION: The dependent viscera sign increases the detection at CT of acute diaphragmatic rupture after blunt trauma.     

Helical CT of diaphragmatic rupture caused by blunt trauma

OBJECTIVE: The purpose of this study was to determine the diagnostic sensitivity and specificity of helical CT with sagittal and coronal reformatted images in detecting diaphragmatic rupture after blunt trauma. MATERIALS AND METHODS: Chest and abdominal helical CT scans obtained in 41 patients with suspected diaphragmatic injury after major blunt trauma were reviewed by three observers who were unaware of surgical findings. Coronal and sagittal reformatted images were reviewed for each patient as well. Findings consistent with diaphragmatic injury, such as waistlike constriction of abdominal viscera (i.e., the "collar sign"), intrathoracic herniation of abdominal contents, and diaphragmatic discontinuity were recorded. Sensitivity and specificity of helical CT were calculated on the basis of surgical findings and clinical follow-up. RESULTS: Helical CT was performed preoperatively in 23 patients with diaphragmatic rupture (left, n = 17; right, n = 5; bilateral, n = 1). An additional 18 patients underwent helical CT to further evaluate suspicious findings seen on chest radiography at admission and were found to have an intact diaphragm. Sensitivity for detecting left-sided diaphragmatic rupture was 78% and specificity was 100%. Sensitivity for the detection of right-sided diaphragmatic rupture was 50% and specificity was 100%. The most common CT finding of diaphragmatic rupture was the collar sign, identified in 15 patients (sensitivity, 63%; specificity, 100%). Diaphragmatic discontinuity was seen in four patients. CONCLUSION: Helical CT, especially with the aid of reformatted images, is useful in the diagnosis of acute diaphragmatic rupture after blunt trauma. Helical CT can be used to detect 78% of left-sided and 50% of right-sided injuries.     

Multidetector-row CT of right hemidiaphragmatic rupture caused by blunt trauma: a review of 12 cases

AIM: To determine the usefulness of multidetector-row CT (MDCT) with multiplanar reformatted (MPR) images in the sagittal and coronal plane in diagnosing acute right hemidiaphragmatic rupture. MATERIALS AND METHODS: Twelve patients were identified who received chest and abdominal MDCT after major blunt trauma diagnosed with right diaphragmatic injury. Sagittal and coronal reformations were performed in all cases. The images were retrospectively reviewed by two experienced radiologists for signs of right diaphragm injury, such as direct diaphragm discontinuity, the "collar sign", the "dependent viscera sign", and intra-thoracic location of herniated abdominal contents. RESULTS: Of the 12 cases of right hemidiaphragm rupture, diaphragm discontinuity was seen in seven (58%) cases, the collar sign in five (42%), the dependent viscera sign in four (33%), and transdiaphragmatic herniation of the right colon and fat in another. Two variants of the collar sign were apparent on high-quality sagittal and coronal reformations. The first, termed the "hump sign", describes a rounded portion of liver herniating through the diaphragm forming a hump-shaped mass, and the second, termed the "band sign," is a linear lucency across the liver along the torn edges of the hemidiaphragm. The hump sign occurred in 10 (83%) patients and the band sign in four (33%). CONCLUSION: MDCT is very useful in the diagnosis of right hemidiaphragm injury caused by blunt trauma when sagittal and coronal reformatted images are obtained, and should allow more frequent preoperative diagnosis.     

Sinus cut-off sign: a helpful sign in the CT diagnosis of diaphragmatic rupture associated with pleural effusion

The objective of our study was to describe the "sinus cut-off" sign at CT in the diagnosis of diaphragmatic rupture in patients with blunt abdominal trauma complicated with pleural effusion, and evaluate its utility in an experimental model. Between January 2004 and March 2005, we observed an unusual interruption of costophrenic sinus at CT in three patients with blunt abdominal trauma accompanied with pleural effusion. This observation prompted us to evaluate the utility of this sign in an experimental model. Laparotomically, we created 2 cm diapragmatic lacerations at each hemidiaphragm in two rabbits and pushed up the abdominal viscera with omentum through the defect. To simulate hemothorax, we also injected 5-10 mL of diluted contrast material into the pleural space. Using a dual-slice helical CT scanner, limited thoracoabdominal CT examination was performed before and after injection of intrapleural contrast material. The images were analyzed for the presence of CT signs for diaphragmatic injury. The left posterior costophrenic sulcus was interrupted in all of the three patients with left pleural effusion. While it was associated with other findings of diaphragmatic injury, the "sinus cut-off sign" was the sole finding in one patient. The sinus cut-off sign was observed on the CT scans of 100% of the rabbits with a left and right sided diaphragmatic rupture. The "sinus cut-off sign" is useful and can increase the CT detection of acute diaphragmatic injury associated with pleural effusion.     

Helical CT of blunt diaphragmatic rupture

OBJECTIVE: This study evaluated CT findings for signs of blunt diaphragmatic rupture. MATERIALS AND METHODS: CT examinations of 179 blunt trauma patients, including 11 with left-sided and five with right-sided blunt diaphragmatic rupture, were reviewed by two staff radiologists who first decided by consensus on the presence or absence of 11 published signs of blunt diaphragmatic rupture and then formulated the diagnosis in terms of absence of, presence of, or suggestion of blunt diaphragmatic rupture. The significance of the findings was assessed by multivariate logistic regression. Four other reviewers interpreted the CT findings independently. They were asked first to formulate a diagnosis in terms of absence of, presence of, or suggestion of blunt diaphragmatic rupture and then to enumerate the findings supporting a diagnosis or suggestion of blunt diaphragmatic rupture. These findings were compared with those of the staff radiologists. RESULTS: Diaphragmatic discontinuity, diaphragmatic thickening, segmental nonrecognition of the diaphragm, intrathoracic herniation of abdominal viscera, elevation of the diaphragm, and both hemothorax and hemoperitoneum were strong predictors of blunt diaphragmatic rupture (p < 0.001). The combination of the first three findings was 100% sensitive (16/16). The staff radiologists' sensitivity for diagnosing blunt diaphragmatic rupture was 100% (16/16). The four reviewers' sensitivities were 56.2% (9/16), 81.2% (13/16), 62.5% (10/16), and 87.5% (14/16). CONCLUSION: Six of 11 signs were good predictors of blunt diaphragmatic rupture. Despite diaphragmatic thickening, focal defect and segmental nonrecognition had 100% cumulative sensitivity; the reviewers formulating the diagnosis before analyzing CT signs overlooked blunt diaphragmatic rupture on CT in 12.5-43.8% of the patients.     

Traumatic diaphragmatic injury: a review of CT signs and the difference between blunt and penetrating injury

PURPOSE

We aimed to present the frequency of computed tomography (CT) signs of diaphragmatic rupture and the differences between blunt and penetrating trauma.

MATERIALS AND METHODS

The CT scans of 23 patients with surgically proven diaphragmatic tears (both blunt and penetrating) were retrospectively reviewed for previously described CT signs of diaphragmatic injuries. The overall frequency of CT signs was reported; frequency of signs in right- and left-sided injuries and blunt and penetrating trauma were separately tabulated and statistically compared.

RESULTS

The discontinuous diaphragm sign was the most common sign, observed in 95.7% of patients, followed by diaphragmatic thickening (69.6%). While the dependent viscera sign and collar sign were exclusively observed in blunt-trauma patients, organ herniation (P = 0.05) and dangling diaphragm (P = 0.0086) signs were observed significantly more often in blunt trauma than in penetrating trauma. Contiguous injury on either side of the diaphragm was observed more often in penetrating trauma (83.3%) than in blunt trauma (17.7%).

CONCLUSION

Knowledge of the mechanism of injury and familiarity with all CT signs of diaphragmatic injury are necessary to avoid a missed diagnosis because there is variability in the overall occurrence of these signs, with significant differences between blunt and penetrating trauma.Traumatic diaphragmatic injury has been found in 3%–8% of patients undergoing surgical exploration after blunt trauma and in 10% of patients with penetrating trauma (1, 2). The rate of initially missed diagnoses on computed tomography (CT) ranges from 12% to 63%. A missed diagnosis can later present as intrathoracic visceral herniation and strangulation with a mortality rate of 30%–60% (2, 3). In this era of increasing nonoperative management for most cases of blunt abdominal trauma, it becomes essential to diagnose diaphragmatic rupture on imaging to ensure early and timely operative repair of the rupture. The reasons for missed early diagnoses include potentially distracting and more severe thoracic and abdominal visceral injuries and lack of familiarity with all the imaging appearances and signs of diaphragmatic rupture (2, 4).Various imaging modalities including chest radiographs, ultrasonography, CT, and magnetic resonance imaging have been used in the diagnosis of diaphragmatic rupture (1). Currently, multidetector CT (MDCT) is the modality of choice for the detection of diaphragmatic injury. MDCT has increased the accuracy of diagnosis of diaphragmatic rupture. MDCT has inherent technical advantages, such as rapid, volumetric data acquisition for the chest and abdomen within a single breath hold, minimization of motion artifacts, thin-section reconstruction and sagittal and coronal reformat-reducing partial-volume effects that assist in diagnosing subtle defects (1). MDCT also aids in detecting the associated chest, abdomen, ribs, and bony injuries in these polytrauma patients. Various studies have revealed CT to have a variable sensitivity and specificity of 61%–87% and 72%–100%, respectively, for the diagnosis of diaphragmatic rupture (1, 5–7). Killeen et al. (6) demonstrated that the sensitivity for detecting left-sided ruptures (78%) is higher than for right-sided ruptures (50%). This finding has been attributed to the better soft tissue-fat contrast on the left side and the difficulty in diagnosing subtle liver herniation on the right side.Various signs of diaphragmatic rupture have been described on CT. These signs have been divided into direct and indirect signs and signs of uncertain/controversial origin, according to Desir and Ghaye (8), and have been tabulated in 2, 3).

Table 1.

CT signs of diaphragmatic injury^a

Right diaphragmatic rupture and hepatic hernia: an indirect sign on computed tomography

We report a case of blunt traumatic right diaphragm rupture with hepatic hernia. The diagnosis was first suggested by an abnormal hepatic location depicted on axial CT. This finding can be considered as a potentially new indirect sign of right diaphragm rupture in patients with blunt trauma. The diagnosis was then confirmed by reformatted CT and MR images. Received: 2 June 1998; Revision received: 5 August 1998; Accepted: 25 August 1998     

The dangling diaphragm sign: sensitivity and comparison with existing CT signs of blunt traumatic diaphragmatic rupture

The objectives of our study were to describe a new CT sign of diaphragmatic injury, the “dangling diaphragm” sign, and assess its comparative utility relative to other signs in the diagnosis of diaphragmatic injury resulting from blunt trauma. CT scans of 16 blunt trauma patients (12 men and four women, mean age 36.6 years old) with surgically proven diaphragmatic injury and 32 blunt trauma patients (24 men and eight women; mean age 37.4 years old) without evidence of diaphragmatic injury at surgery were blindly reviewed by three board certified radiologists specializing in body imaging. Studies were evaluated for the presence of established signs of diaphragmatic injury, as well as the dangling diaphragm sign, in which the free edge of the torn hemidiaphragm curls inward from its normal course parallel to the body wall. The sensitivity and specificity of each sign were determined, as were the correlation between the signs and the interobserver agreement in evaluation of these findings. The radiologists’ overall impression as to whether rupture was present was also recorded. In select cases, coronal and/or sagittal reformatted images were available, and they were reviewed following evaluation of the original axial images. Any change in interpretation due to these images was noted. The sensitivity of the radiologists’ overall impression for detection of diaphragmatic injury was 77%, with 98% specificity. Individual signs of diaphragmatic injury had sensitivities ranging from 44% to 69%, with specificities of 98% to 100%. The dangling diaphragm sign had a sensitivity of 54% and a specificity of 98%, similar to the other signs. Multiple signs were present in most cases of diaphragmatic injury, and coronal and sagittal reformatted images had little impact. Diaphragmatic injury remains a challenging radiographic diagnosis. The dangling diaphragm is a conspicuous sign of diaphragmatic injury, and awareness of it may increase detection of diaphragmatic injury on CT studies.     

Traumatic rupture of the right hemidiaphragm: Diagnosis by chest radiography

Sixteen cases of blunt trauma resulting in surgically confirmed traumatic rupture of the right hemidiaphragm were reviewed from the Trauma Registry of Allegheny General Hospital. Only 10 of the 16 cases (63%) could be retrospectively diagnosed on chest radiographs. We found that a diagnosis of right-sided diaphragmatic rupture can be suggested when the apex of the right hemidiaphragm is shifted superomedially to a position approximately midway between the mediastinum and the right chest wall. Eight of these 10 cases with positive chest radiographic findings exhibited this superomedial shift of the diaphragmatic apex. On initial assessment, without using this sign, 5 of these 10 cases were not diagnosed. We feel that the combination of elevation of the right hemidiaphragm in association with a medial shift of the apex of that diaphragmatic dome in a patient who has suffered extensive blunt thoracoabdominal trauma is strongly suggestive of traumatic rupture of the diaphragm.     

创伤性膈肌破裂的诊断与治疗

目的 探讨创伤性膈肌破裂的早期诊断和治疗.方法 回顾性分析我科17年间收治的161例创伤性膈肌破裂患者的临床资料,包括诊断方法、术前确诊率、膈疝发生率、手术治疗方式和患者结局等.结果 161例中男139例,女22例;年龄9～84岁,平均32.4岁.ISS 13～66分,平均27.8;65.2%入院时有休克.钝性伤36例、穿透伤125例.术前膈肌损伤确诊率在钝性和穿透伤分别为88.9%和78.4%.膈疝发生率在钝性和穿透伤分别为94.4%和14.4%(P＜0.01).手术经胸30例,经腹106例,分别剖胸和剖腹18例、胸腹联合切口7例.病死率10.6%,ISS平均41.6;主要死因为失血性休克和严重感染并发症.钝性和穿透伤病死率分别为22.2%和7.2%(P＜0.01).结论 膈伤诊断依据,钝性伤主要为膈疝的影像学表现,穿透伤伤口远处腹或胸部也有阳性体征或影像学征象.膈疝手术的关键是准确判断疝入胃肠的活力.穿透伤预后相对较好.