Sigmoid colon schwannoma is a rare benign gastrointestinal tumor that is challenging to be diagnosed preoperatively.This paper reported a case of sigmoid colon schwannoma that was preoperatively misdiagnosed as a gastrointestinal stromal tumor on ultrasonography.Intraoperative frozen section analysis identified it as a spindle cell tumor,with definitive diagnosis confirmed as gastrointestinal schwannoma via immunohistochemistry.This paper summarizes the similarities and differentiating features of intestinal stromal tumors and schwannomas on ultrasonographic imaging.By analyzing and discussing previous literature,we aim to enhance the diagnostic and differential diagnostic capabilities of ultrasonographers in preoperative evaluation of intestinal schwannomas,thereby providing reliable evidence for clinicians in the diagnosis and management of this condition.
Humans ; Neurilemmoma/diagnostic imaging* ; Ultrasonography ; Sigmoid Neoplasms/diagnostic imaging* ; Male ; Colon, Sigmoid/diagnostic imaging* ; Middle Aged ; Female ; Diagnosis, Differential

Objective: To evaluate the mid-term efficacy of laparoscopic-assisted natural orifice specimen extraction surgery (NOSES) colectomy using the Cai tube in the treatment of left colorectal cancer. Methods: A prospective randomized control trial (China Clinical Trials Registration Number: ChiCTR-OOR-15007060) was performed. Sixty patients with left colorectal cancer at Department of Gastrointestinal Surgery of Zhongshan Hospital from September 2015 to August 2017 were prospectively enrolled. Case inclusion criteria: (1) left colorectal adenocarcinoma (rectal cancer with distance ≥ 8 cm from tumor low margin to anal edge, sigmoid colon cancer, descending colon cancer and left transverse colon cancer) confirmed by preoperative pathology; (2) satisfactory conditions of conventional laparoscopic surgery; (3) maximum diameter of the tumor < 4.5 cm confirmed by preoperative abdominal and pelvic CT or MRI; (4) BMI < 30 kg/m². Case exclusion criteria: (1) benign lesions, mucinous adenocarcinoma, signet-ring cell carcinoma and other special pathological types of tumors confirmed by preoperative pathological examination; (2) multiple or recurrent cancers; (3) with a history of neoadjuvant chemoradiotherapy; (4) obvious regional infiltration or distant metastasis indicated by preoperative imaging examination; (5) intestinal obstruction, intestinal perforation, etc. Participants were randomly assigned to NOSES group (using the Cai tube) and conventional laparoscopy (CL) group by random number table method. Clinical data between two groups were compared and analyzed, including perioperative conditions, tumor exfoliation cell detection and bacterial culture results of intraperitoneal lavage fluid, postoperative complications (Clavien-Dindo grading), postoperative pain [visual simulation scoring (VAS) assessment], anal function (Kirwan anal function grading assessment), and postoperative 3-year disease-free survival (DFS), overall survival (OS), overall recurrence rate, and local recurrence rate. Results: A total of 60 patients were enrolled, with 30 in the NOSES group and 30 in the CL group. All the patients in the NOSES group successfully completed operation with Cai tube. Baseline data between the two groups were not significantly different (all P>0.05). There were no statistically significant differences between two groups in conversion rate to open surgery, number of lymph node harivested, proximal and distal resection margin of tumor, negative rate of circumferential margin, operation time, blood loss, inflammatory indexes, postoperative anal function, postoperative hospital stay, hospitalization cost, morbidity of postoperative complications (Clavien-Dindo grade II or above) (all P>0.05). Compared to the CL group, the NOSES group had lower maximum postoperative VAS score (2.5±0.3 vs. 5.1±0.4, t=3.187, P<0.01), and fewer use of additional postoperative analgesia [6.7% (2/30) vs. 33.3% (10/30),χ²=6.670, P=0.02]. The postoperative time to gas passage was shorter in the NOSES group [(2.2±1.4) days vs. (3.1±1.2) days,P=0.026]. No tumor cells and bacterial contamination were found in abdominal lavage fluid before and after operation in either group. The anal function at postoperative 3-month of all the patients in the NOSES group was Kirwan grade I to II, while in the CL group, anal function of 2 cases (6.7%) was Kirwan grade III, and of 28 cases was also Kirwan grade I to II, whose difference was not statistically significant (P>0.05). In the NOSES group and the CL group, 3-year DFS was 96.7% and 83.3% (P=0.090), OS was 100% and 90% (P=0.096), overall recurrence rate was 3.3% and 10.0% (P=0.166), and local recurrence rate was 3.3% and 3.3% (P=0.999), respectively, whose differences were not statistically significant (all P>0.05). Conclusions: In the treatment of left colorectal cancer, compared with conventional laparoscopic colectomy, NOSES colectomy using Cai tube exhibits less scar, less postoperative pain, shorter recovery of gastrointestinal function, and similar mid-term outcomes. Given proper surgical indications, the surgical procedure is safe and feasible.
Follow-Up Studies ; Humans ; Laparoscopy ; Pain, Postoperative ; Postoperative Complications/surgery* ; Prospective Studies ; Rectal Neoplasms/surgery* ; Retrospective Studies ; Sigmoid Neoplasms/surgery* ; Treatment Outcome

OBJECTIVES: To study the features of intestinal flora in children with food protein-induced proctocolitis (FPIP) by high-throughput sequencing. METHODS: A total of 31 children, aged <6 months, who experienced FPIP after exclusive breastfeeding and attended the outpatient service of the Third Affiliated Hospital of Zunyi Medical University from October 2018 to February 2021 were enrolled as the FPIP group. Thirty-one healthy infants were enrolled as the control group. Fecal samples were collected to extract DNA for PCR amplification. High-throughput sequencing was used to perform a bioinformatics analysis of 16S rDNA V3-V4 fragments in fecal samples. RESULTS: The diversity analysis of intestinal flora showed that compared with the control group, the FPIP group had a lower Shannon index for diversity (P>0.05) and a significantly higher Chao index for abundance (P<0.01). At the phylum level, the intestinal flora in both groups were composed of Firmicutes, Actinobacteria, Proteobacteria, and Bacteroidetes. Compared with the control group, the FPIP group had a significant reduction in the composition ratio of Actinobacteria (P<0.001) and a significant increase in the composition ratio of Proteobacteria (P<0.05). At the genus level, the intestinal flora in the FPIP group were mainly composed of Escherichia, Clostridium, Enterococcus, Klebsiella, and Bifidobacterium, and the intestinal flora in the control group were mainly composed of Bifidobacterium and Streptococcus. Compared with the control group, the FPIP group had a significant reduction in the composition ratio of Bifidobacterium and Ruminococcus (P<0.05) and significant increases in the composition ratios of Clostridium and Shigella (P<0.05). CONCLUSIONS Compared with the control group, the FPIP group has a reduction in the diversity of intestinal flora and an increase in their abundance, and there are certain differences in several bacterial genera. These results suggest that changes in the composition of intestinal flora at genus level may play an important role in the development and progression of FPIP.
Bacteria/genetics* ; Bifidobacterium/genetics* ; Child ; Gastrointestinal Microbiome ; High-Throughput Nucleotide Sequencing/methods* ; Humans ; Infant ; Proctocolitis ; RNA, Ribosomal, 16S/genetics*

Anastomosis, Surgical ; Colon, Sigmoid/surgery* ; Colorectal Neoplasms/surgery* ; Humans ; Robotics

Tumor spreading through the lymphatic drainage is an important metastatic pathway for rectum and sigmoid colon carcinoma. Regional lymph node dissection, as an important part of radical resection of colorectal cancer, is the main way for patients with colorectal cancer to achieve radical resection and acquire tumor-free survival. The regional lymph nodes of sigmoid cancer include paracolic lymph nodes, intermediate lymph nodes, and central lymph nodes locating at the root of blood vessel, and radical surgery should include lymph node dissection at the above three stations. The lymphatic pathways of metastasis for rectal cancer include longitudinal metastasis within the mesorectum and lateral metastasis beyond the mesorectum. The standard surgical method of rectal cancer is total mesorectal excision (TME) at present, and the resection range includes the metastatic lymph nodes within the mesorectum through the longitudinal pathway. However, there are many different opinions about lateral lymph node dissection(LLND) aiming at the metastatic lymph nodes locating at the lateral space of rectum. The range of lymph node dissection for rectum and sigmoid cancer is a vital factor that determines the prognosis of patients. Insufficient range of dissection can lead to residual metastatic lymph nodes and have serious impacts on the prognosis of patients. Excessive range of dissection can result in greater surgical trauma, prolonged operation time, more blood loss, and higher rate of complication without oncological benefits. Individualizating the appropriate resection range of rectum and sigmoid colon cancer on the basis of standardization and according to the clinical stage and invasion range of tumor demonstrates great significance of ensuring the radical operation, reducing trauma, promoting rehabilitation, protecting the function and improving the prognosis.
Humans ; Lymph Node Excision/methods* ; Lymph Nodes/pathology* ; Rectal Neoplasms/pathology* ; Rectum/pathology* ; Reference Standards ; Sigmoid Neoplasms/surgery*

We reported a case of irreducible indirect inguinal hernia caused by sigmoid colon cancer entering the right groin.The patient complained about a right groin mass for more than 60 years with progressive enlargement for 3 years and pain for half a month.Abdominal CT examination at admission showed rectum and sigmoid colon hernia in the right inguinal area and thickening of sigmoid colon wall.Electronic colonoscopy and pathological diagnosis showed sigmoid colon cancer.Therefore,the result of preliminary diagnosis was irreducible indirect inguinal hernia caused by sigmoid colon cancer entering the right groin.We converted laparoscopic exploration to laparotomy followed by radical sigmoidectomy and employed end-to-end anastomosis of descending colon and rectum in combination with repair of right inguinal hernia.The patient recovered well after operation and was discharged.
Colon, Sigmoid/surgery* ; Groin ; Hernia, Inguinal/surgery* ; Humans ; Laparoscopy ; Sigmoid Neoplasms/surgery*

PURPOSE: We report two patients diagnosed with a sinus thrombosis with papillary edema. CASE SUMMARY: Case 1 was a 27-year-old male who presented with complaints of headache and vomiting for 2 months and blurred vision in both eyes. The best-corrected visual acuity (BCVA) was 1.0 in the right eye and 1.0 in the left eye. A visual field (VF) examination revealed a binocular peripheral VF defect and optical coherence tomography (OCT) and a fundus examination indicated optic disc swelling in both eyes. Brain magnetic resonance imaging (MRI) showed no specific finding but magnetic resonance venography revealed filling defect signs in the transverse sinus and a cerebrospinal fluid examination indicated elevated intracranial pressure (ICP). Case 2 was a 54-year-old female who came to our hospital with suspicion of bilateral optic disc swelling. The BCVA was 0.9 in the right eye and 1.0 in the left eye. A VF examination revealed an inferior-temporal VF defect and blind spot enlargement in the right eye. OCT and a fundus examination showed optic disc swelling in both eyes. Brain MRI showed no specific finding but magnetic resonance venography revealed a decrease in blood flow in the transverse sinus, sigmoid sinus. A cerebrospinal fluid examination indicated elevated ICP. CONCLUSIONS: In the case of optic disc swelling in both eyes, a secondary cause of ICP elevation and the possibility of optic disc swelling due to sinus thrombosis should be considered, and brain MRI and venography are needed to distinguish these possibilities.
Adult ; Brain ; Cerebrospinal Fluid ; Colon, Sigmoid ; Edema ; Female ; Headache ; Humans ; Intracranial Hypertension ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Optic Disk ; Optic Nerve Diseases ; Papilledema ; Phlebography ; Sinus Thrombosis, Intracranial ; Telescopes ; Tomography, Optical Coherence ; Visual Acuity ; Visual Fields ; Vomiting

PURPOSE: Bevacizumab has been used as a promising drug for metastatic colorectal cancer in combination with chemotherapeutic agents. However, it has a few serious adverse effects, such as intestinal bleeding or perforation. The purpose of this study is to identify the clinical characteristics of intestinal perforation induced by bevacizumab in colorectal cancer patients.METHODS: From January 2007 to June 2018, a total of 488 patients underwent chemotherapy with bevacizumab for metastatic colorectal cancer. Medical records were reviewed retrospectively.RESULTS: Nine patients (1.8%) were identified with intestinal perforation induced with bevacizumab. The median age was 59 years (range, 36–68 years). The primary tumor site was the sigmoid colon in six patients, the rectum in three patients. The liver was the most common metastatic organ (7 patients). Perforation sites were primary tumor site of the colorectum in four patients and the small bowel in five patients. Intestinal perforation was developed after a median of 3 chemotherapy cycles (range, 1–15 cycles), and a median of 7 days (range, 3–32 days) after chemotherapy. One patient expired due to sepsis.CONCLUSION: Bevacizumab induced intestinal perforation is a lethal adverse effect in patients with colorectal cancers. The characteristics of intestinal perforation varied according to perforation site, previous chemotherapy cycles, and clinical course. Careful monitoring is necessary with the use of bevacizumab in conjunction with chemotherapeutic agents.
Bevacizumab ; Colon, Sigmoid ; Colorectal Neoplasms ; Drug Therapy ; Hemorrhage ; Humans ; Intestinal Perforation ; Liver ; Medical Records ; Rectum ; Retrospective Studies ; Sepsis

Colorectal carcinoma invading the submucosa but not the muscularis propria (pT1) represents the earliest form of clinically relevant colorectal cancer in most patients. T1 colorectal cancer with synchronous liver metastasis is considered to be rare. We report a rare case of T1 colon cancer with synchronous liver metastasis not detected by preoperative imaging study. A 54-year-old male patient presented to our department for treatment of sigmoid colon cancer following an endoscopic submucosal dissection. Histopathological examination revealed the pedunculated mass was moderately differentiated adenocarcinoma without lymphovascular invasion and the depth of submucosal invasion was 2,000 µm, the resection margin was not involved. We performed a laparoscopic anterior resection with lymph node dissection. After the 3 months, the patient's carcinoembryonic antigen level elevated from 1.4 to 7.26 ng/mL (normal level: <1.5 ng/mL) and the abdominal computed tomography and FDG-PET/CT (positron emission tomography-computed tomography) showed multiple hepatic metastases in both hepatic lobes (SUVmax: 5.6) without evidence of local recurrence or lymphadenopathy. We strongly suspected a synchronous liver metastasis not detected by imaging study as opposed to a systemic recurrence. Therefore, evaluation and follow-up protocol of T1 colorectal cancer should be changed for discovery and prediction of synchronous liver metastasis; because we cannot exclude the possibility of synchronous liver metastasis.
Adenocarcinoma ; Carcinoembryonic Antigen ; Colon ; Colonic Neoplasms ; Colorectal Neoplasms ; Follow-Up Studies ; Humans ; Liver ; Lymph Node Excision ; Lymphatic Diseases ; Male ; Middle Aged ; Neoplasm Metastasis ; Recurrence ; Sigmoid Neoplasms

PURPOSE: Although laparoscopic surgery is widely accepted in the treatment of colorectal cancer, conversion to open surgery is associated with the rate of unfavorable outcomes. The aim of this study was to determine the factors associated with open conversion from laparoscopic surgery for colorectal cancer.METHODS: A total of 3,002 patients who underwent laparoscopic colectomy as an initial plan for the treatment of colorectal cancer located from the sigmoid colon to the rectum were retrospectively evaluated between January 2009 and December 2018 at Samsung Medical Center in Korea. Risk factors significantly associated with open conversion were determined using univariate and multivariate regression models.RESULTS: Among the 3,002 patients, open conversion was performed in 120 patients (4%). Age >60 years (adjusted odds ratio [AOR], 2.370), preoperative bowel obstruction (AOR, 2.348), clinical T4 stage (AOR, 2.201), and serum carcinoembryonic antigen level >5 ng/mL (AOR, 2.289) were significantly associated with open conversion. Moreover, mucinous carcinoma was a significantly more frequent histopathologic type than adenocarcinoma (10.0% vs. 3.2%, P<0.001) in the open conversion group with an AOR of 2.549 (confidence interval, 1.259–5.159; P=0.009).CONCLUSION: The present study presented a novel finding, i.e. mucinous carcinoma as the histopathologic type could be an independent predictive factor for conversion from laparoscopic colectomy to open surgery. Identifying patients with mucinous carcinoma will help stratify the risk of open conversion preoperatively.
Adenocarcinoma ; Adenocarcinoma, Mucinous ; Carcinoembryonic Antigen ; Colectomy ; Colon, Sigmoid ; Colorectal Neoplasms ; Conversion to Open Surgery ; Humans ; Korea ; Laparoscopy ; Mucins ; Odds Ratio ; Rectum ; Retrospective Studies ; Risk Factors