Clinicopathological evaluation of duodenal well-differentiated endocrine tumors

AIM:To assess the clinicopathological characteristics of duodenal well-differentiated endocrine tumors.METHODS:We examined clinicopathological characteristics in 11 consecutive patients with duodenal well-differentiated endocrine tumors treated by endoscopic therapy or surgery in our hospital from 1992 through 2007.Patients with well-differentiated endocrine tu-mors of the papilla of Vater or with gastrinoma were excluded.RESULTS:Three patients received endoscopic treatment,and 8 underwent surgery.In patients who received endoscopic treatment,the tumor diameter was less than 1.0 cm,with no histopathological evidence of lymphovascular invasion or invasion of the muscularis.There were no complications such as late bleedingor perforation after treatment.Among 8 patients with tumors less than 1.0 cm in diameter,3 underwent partial resection,and 2 underwent radical surgery.Three patients had lymphovascular invasion,1 had invasion of the muscularis,and 1 had proximal lymph node metastasis.Among 3 patients with tumors 1.0 cm or more in diameter,1 underwent partial resection,and 2 under-went radical surgery.One patient had lymphovascular invasion,with no lymph node metastasis.After treatment,all patients are alive and have remained free of metastasis and recurrence.CONCLUSION:Duodenal well-differentiated endocrine tumors less than 1.0 cm in diameter have a risk of lym-phovascular invasion,invasion of the muscularis,and lymph node metastasis,irrespective of procedural prob-lems.

Villous adenoma coexistent with focal well-differentiated adenocarcinoma of female urethral orifice: A case report and review of literature

BACKGROUND Villous adenomas of the urinary tract are uncommon. They are morphologically similar to and difficult to differentiate from their counterpart in the colon. The histogenesis and malignant potential are uncertain.CASE SUMMARY A 63-year-old woman was admitted to our hospital with a mass in the urethral orifice. Gross and microscopic pathological examination was suggestive of urethral villous adenoma with focal well-differentiated adenocarcinoma. The whole urethra and part of the bladder were excised. No further treatment was offered. Carcinoembryonic antigen, cytokeratin 7, cytokeratin 20, epithelial membrane antigen, and p53 protein were positive, and the ratio of Ki-67 was 60%. After follow-up at 11 mo, the patient was cured and had no recurrence.CONCLUSION Immunohistochemistry is important for differential diagnosis of villous adenoma of the urinary system. Complete surgical resection of the urinary tract is curative.

Personalized treatment of well-differentiated gastric neuroendocrine tumors based on clinicopathological classification and grading:A multicenter retrospective study

Background:The incidence of well-differentiated gastric neuroendocrine tumors(G-NET)is increasing annually,and while they have a good prognosis and low mortality rate,their high recurrence rate makes treatment options controversial.This study aims to determine the relationship between individualized treatment plans and the recurrence of G-NET.Methods:We performed a multicenter,retrospective study of 94 patients with highly differentiated G-NET and treated at Peking Union Medical College Hospital,Yantai Yuhuangding Hospital,and Beijing Zhong-Neng-Jian Hospital from November 2015 to September 2023.Risk factors for recurrence of G-NETs were investigated using chi-squared test and multifactorial logistic regression analysis.Results:After a median follow-up of 49 months,the overall recurrence rate among the 94 G-NET patients was 14%(13/94).The recurrence rates of endoscopic mucosal resection(EMR),endoscopic submucosal dissection(ESD),somatostatin analog(SSA)therapy,and surgery were 43%(6/14),10%(5/49),5%(1/22),and 11%(1/9),respectively.Post-treatment recurrence rates were significantly different(P=0.014)among four treatments(EMR,ESD,SSA,and surgery),and further subgroup comparisons revealed lower recurrence rates in the ESD and SSA groups than in the EMR group.From the second month onward,SSA therapy considerably reduced the gastrin levels from 1081.0(571.5,2472.8)pg/mL to 461.5(255.3,795.0)pg/mL(Z=-3.521,P<0.001).Both chi-squared test and multifactorial logistic regression analysis suggested that among the clinicopathological parameters studied,only the pre-treatment gastrin level(P=0.018 and 0.005)and the type of treatment(P=0.014 and 0.017)were significantly associated with G-NET recurrence.Conclusions:Individualized treatment strategies may reduce the risk of relapse after G-NET treatment.Long-term SSA therapy may be a secure and efficacious treatment option for type 1 G-NET with more than six lesions,and it substantially decreases the incidence of post-treatment recurrence.

Differentiation between dysplastic nodule and early-stage hepatocellular carcinoma: The utility of conventional MR imaging

AIM:To elucidate the variety of ways early-stage hepatocellular carcinoma(HCC)can appear on magnetic resonance(MR)imaging by analyzing T1-weighted,T2-weighted,and gadolinium-enhanced dynamic studies.METHODS:Seventy-three patients with well-differentiated HCC(wHCC)or dysplastic nodules were retrospectively identified from medical records,and new histological sections were prepared and reviewed.The tumor nodules were categorized into three groups:dysplastic nodule(DN),wHCC compatible with Edmondson-Steiner grade I HCC(w1-HCC),and wHCC compatible with Edmondson-Steiner gradeⅡHCC(w2-HCC).The signal intensity on pre-contrast MR imaging and the enhancing pattern for each tumor were recorded and compared between the three tumor groups.RESULTS:Among the 73 patients,14 were diagnosed as having DN,40 were diagnosed as having w1-HCC,and 19 were diagnosed as having w2-HCC.Hyperintensity measurements on T2-weighted axial images(T2WI)were statistically significant between DNs and wHCC(P=0.006)and between DN and w1-HCC(P=0.02).The other imaging features revealed no significant differences between DN and wHCC or between DN and w1-HCC.Hyperintensity on both T1W out-phase imaging(P=0.007)and arterial enhancement on dynamic study(P=0.005)showed statistically significant differences between w1-HCC and w2-HCC.The other imaging features revealed no significant differences between w1-HCC and w2-HCC.CONCLUSION:In the follow-up for a cirrhotic nodule,increased signal intensity on T2WI may be a sign of malignant transformation.Furthermore,a noted loss of hyperintensity on T1WI and the detection of arterial enhancement might indicate further progression of the histological grade.

Malignant carcinoid tumor of the cystic duct:a rare cause of bile duct obstruction

BACKGROUND:Carcinoid tumors of the extrahepatic biliary tree are extremely rare malignancies,accounting for 0.2%-2%of all gastrointestinal carcinoid tumors,while carcinoids of the cystic duct are an uncommon entity and an extremely unusual cause of bile duct obstruction.METHODS:After an extensive literature review,we retrospectively analysed 61 cases of carcinoid tumor of the biliary tree as well as one additional case of a 60-yearold female with symptoms and laboratory/imaging examination findings compatible with those of a malignant biliary tract obstruction.At laparotomy,resection of the gallbladder and common bile duct was performed.Histological study revealed a well-differentiated neuroendocrine carcinoma of the cystic duct.The patient remained disease-free at 16 months.RESULTS:Our presentation is the seventh case reported in the world literature.Compared to cholangiocarcinoma,analysis of the reviewed group indicates an increased incidence of extrahepatic carcinoid tumors in younger persons along with a slight female predominance.Statistically,the most common anatomic location is the common bile duct,followed by the perihilar region and the cystic duct.Jaundice is the most common finding.Curative surgery was realized in the majority of cases and longterm disease-free survival was achieved when surgery was curative.CONCLUSIONS:Carcinoid tumors obstructing the biliary tree are extremely difficult to diagnose preoperatively,and nearly impossible to differentiate from non-neuroendocrine tumors.As surgery offers the only potential cure for both biliary carcinoids and cholangiocarcinoma,we recommend aggressive surgical therapy as the treatment of choice in every case of potentially resectable biliary tumor.

Giant retroperitoneal lipoma presenting with abdominal distention:A case report and review of the literature

BACKGROUND Retroperitoneal lipomas are extremely rare tumors and tend to be large in size(>10 cm)when diagnosed,causing various clinical manifestations.Preoperative diagnosis of retroperitoneal lipomas is difficult.There is a lack of relevant information about the management and prognosis of these benign tumors due to limited reports.CASE SUMMARY A 53-year-old woman who complained about progressive abdominal distention and aggravating satiety was referred to the gynecological outpatient department of Peking Union Medical College Hospital.Computerized tomography(CT)revealed an immense mass with fat density,measuring 28.6 cm×16.6 cm in size.Adjacent organs,including the intestinal tract and uterus,were squeezed to the right side of the abdomen.An exploratory laparotomy was performed with suspicion of liposarcoma.Intraoperatively,a giant yellowish lobulated mass was found occupying the retroperitoneum and it was removed by tumor debulking.Postoperative histopathological results confirmed the diagnosis of retroperitoneal lipoma.CONCLUSION Retroperitoneal lipoma is a very rare condition and is difficult to differentiate from well-differentiated liposarcoma.Radiographic investigations,especially CT and magnetic resonance imaging,are important for preoperative diagnosis.Surgical resection is the fundamental treatment,which is difficult due to its size and relation to neighboring structures.

Hyper-accuracy three-dimensional reconstruction as a tool for better planning of retroperitoneal liposarcoma resection: A case report

BACKGROUND Well-differentiated liposarcoma is the second most common pathologic type of retroperitoneal sarcoma.It is characterized by a huge mass,but multiple organ invasions are common.Surgery is the only treatment option for potential cure.Hyper-accuracy three-dimensional(3D)reconstruction is widely used in robotic partly nephrectomy owing to its ability to visualize overlapping anatomy.CASE SUMMARY A 54-year-old man was admitted for progressive abdominal distension over the preceding 2 mo.Computed tomography revealed a 32 cm×21 cm×12 cm lipomatous mass.Hyper-accuracy 3D reconstruction was performed because of the complex relationship between the mass and nearby tissue.The patient underwent surgical resection,and the tumor did not recur for over 16 mo.CONCLUSION Hyper-accuracy 3D reconstruction is useful for operative planning owing to its intuitiveness and precise determination of anatomical structures in both tumors and nearby tissues.

Mediastinal Liposarcoma: Case Report and Literature Review

Liposarcomas (LS) are the second most common type of soft tissue malignancies in adults;they arise from mesenchymal cells and account for 1% of all adult cancers and 15% of all pediatric cancers. The site of origin can be from anywhere there is fat in the human body. LS are classified based on the primary site of origin, and mediastinal LS are extremely rare. When mediastinal neoplasms are stratified based on histology, they represent less than 1% of all mediastinal tumors. To date, less than 150 cases have been reported in the English literature. This article aims to present an unusual case of an extremely rare malignancy and perform a systematic review of the latest literature. In this report, our group is documenting the presentation, management, and outcome of a 65-year-old male patient with a massive anterior mediastinal primary LS. The tumor was displacing the mediastinum into the right chest, occupying most of the left chest, and pushing the diaphragm into the abdomen. Mediastinal liposarcomas are extremely rare malignancies and can prove to be challenging to diagnose and treat. Aggressive surgical treatment with R0 resection is the gold standard, however, tumor biology in many cases is associated with variable growth rates and encroachment of adjacent vital structures and blood vessels. When complex anatomical structures preclude an R0 resection, there is a high incidence of local recurrence. In cases where there is a high risk of recurrence, radiotherapy is indicated and chemotherapy has a more limited role.