Neoadjuvant Hyperthermia and Chemoradiotherapy for Borderline Resectable Pancreatic Cancer.

Pancreatic cancer(PC)is associated with poor prognosis and low resectability rates. Currently, only 15-20% of all patients are candidates for upfront surgery at the time of diagnosis, which offers the chance of long-term survival. In recent years, patients with borderline resectable PC(BR-PC)have been treated with surgery following neoadjuvant chemoradiotherapy or intensive multi-agent chemotherapy. In PC, which is therapy resistant due to its hypoxic microenvironment, hyperthermia may enhance the effect of chemo(radio)therapy. An 84-year-old man with fatty stool was diagnosed with pancreatic head cancer according to the result of contrast computed tomography(CT), which showed a 37 mm irregular low-density area at the pancreatic head infiltrating nearly half of the superior mesenteric artery(SMA)plexus. There were no findings of lymph node metastasis or distant metastasis. The pretreatment diagnosis was BR-PC, cT3, N0, M0, cStage Ⅱ A. The patient was treated with hyperthermia plus S-1 and radiotherapy. The size of the tumor had reduced from 37 mm to 15 mm after the neoadjuvant therapy, and the infiltration into the SMA plexus had also reduced. Therefore, the patient underwent subtotal stomach-preserving pancreaticoduodenectomy(SSPPD)concomitant resection of the PV, SMV, SV confluence. The histopathological findings were invasive ductal carcinoma with R0 radical resection. There has been no recurrence 18 months after the surgery. Based on the above-mentioned findings, hyperthermia and chemoradiotherapy can be an effective option of neoadjuvant treatment for BR-PC.

[A Case of Lipoma Arising from the Mesentery Proper That Had Difficulty in Differential Diagnosis with Well-Differentiated Liposarcoma].

A 54-year-old male patient with a chief complaint of right lower abdominal pain and nausea visited the reporting hospital. Abdominal computed tomography was performed, which showed findings of a membrane-covered internally heterogeneous solid mass associated with a 11×10 cm well-circumscribed calcification, as well as ileus in the right lower abdomen. Based on the imaging findings, it was diagnosed with liposarcoma, and surgery was performed for both diagnosis and treatment. The mass was located in the mesentery of the terminal ileitis and could be removed without gross residue. Histopathological examination showed altered fat cells and fibrous partition, most of which were lipoma, but well-differentiated liposarcoma could also not be ruled out. It was diagnosed with lipoma mixed with well-differentiated liposarcoma. In particular, lipoma and liposarcoma from the mesentery proper is extremely rare. We encountered a case of lipoma arising from the mesentery proper that had difficulty in differential diagnosis with well-differentiated liposarcoma and here in report it with the addition of some literature consideration.

[Long-Term Disease-Free Survival after Chemoradiotherapy for Postoperative Local Recurrence of Rectal Cancer-A Case Report].

We report a case of a 63-year-old man with a perirectal abscess due to rectal cancer referred to us from another clinic. We performed 3 courses of preoperative chemotherapy using mFOLFOX6 and then performed a Miles operation plus D3 dissection followed by reconstruction of an artificial anus using the ileum. The pathological diagnosis was tub2, pAI(prostate), pN0 (0/12), ND(v+), and fStage Ⅲa. Dehiscence of the perineum wound area occurred 4 months after surgery, for which drainage was required. Local recurrence was then discovered by cytology. We administered mild 40 Gy radiation and chemotherapy using Bmab combined with mFOLFOX6. CT scans showed a significant reduction in the tumor and the tumor marker levels returned to within normal ranges. We then converted to Pmab plus FOLFIRI, which has been administered bimonthly for 3 years to date. The overall chemoradiotherapy duration has been about 5 years. Follow-up imaging findings continue to show sustained remission.

[Two Cases of Surgery Combined with Intraoperative Radiofrequency Ablation for Colorectal Cancer and Synchronous Liver Metastases].

The therapeutic management of simultaneous liver metastasis of colorectal cancer(SCRLM)remains controversial. Although hepatic metastasectomy is the first choice for resectable liver metastasis of colorectal cancer, radiofrequency ablation (RFA)is one of the least invasive application for patients who refuse more invasive treatment such as hepatectomy and longterm systemic chemotherapy or for whom such treatment is not suitable. We report 2 cases of SCRLM treated by surgery combined with intraoperative RFA and adjuvant chemotherapy, raising the possibility of local control in the liver for selected patients.

[A Case of Recurrent Gallbladder Carcinoma Treated with Resection and Hepatic Arterial Infusion].

A 69-year-old woman underwent extended cholecystectomy for gallbladder cancer[T2N0M0, fStage Ⅱ(UICC 7th edition)]. She was then administered adjuvant S-1 and was treated for drug-induced neutropenia. One year later, recurrent lesions were detected in liver S4 and S5. We treated the patient with hepatectomy and hepatic arterial infusion adjuvant chemotherapy by cisplatin, along with the systemic administration of gemcitabine for 10 months. The patient is now doing well without any sign of recurrence 29 months after the initial operation and 16 months after the secondary liver resection.

A case of ectopic pancreatic cancer in the mesentery of the jejunum.

We report a rare case of ectopic pancreatic cancer in the mesentery of the jejunum. A 68-year-old man presented with left abdominal pain. Contrast-enhanced abdominal CT revealed a 3-cm tumor in the mesentery near the ligament of Treitz. He had required surgery for gastric cancer 28 years ago;therefore, surgery was scheduled on the suspicion of recurrence/metastasis of gastric cancer or gastrointestinal stromal tumor (GIST) and mesenteric tumors. A tumor was observed in the mesentery of the jejunum of the ligament of Treitz. Histopathology showed a moderately differentiated adenocarcinoma, and it was diagnosed as a primary ductal pancreatic cancer (Heinrich classification, not classifiable).

Simultaneous laparoscopic total extraperitoneal inguinal hernia repair and laparoscopic appendectomy for Amyand's hernia: a case report.

BACKGROUND: An Amyand's hernia is defined by the presence of a vermiform appendix within an inguinal hernia sac. Most of these cases are not diagnosed preoperatively and the surgical approach is dependent on the type present and associated intraoperative findings. We present a case of a preoperatively diagnosed Amyand's hernia in a man who underwent treatment by simultaneous laparoscopic totally extraperitoneal repair and laparoscopic appendectomy. CASE PRESENTATION: We encountered the case of a 76-year-old Japanese man with a right inguinal pain. Ultrasound and computed tomography confirmed his vermiform appendix herniated into the right inguinal canal. We managed a simultaneous laparoscopic total extraperitoneal inguinal hernia repair with mesh and laparoscopic appendectomy. He was discharged without any postoperative morbidity. CONCLUSIONS: We recommend laparoscopic appendectomy and totally extraperitoneal hernia repair with mesh after laparoscopic reduction for Amyand's hernia.

Clustering Using Boosted Constrained k-Means Algorithm.

This article proposes a constrained clustering algorithm with competitive performance and less computation time to the state-of-the-art methods, which consists of a constrained k-means algorithm enhanced by the boosting principle. Constrained k-means clustering using constraints as background knowledge, although easy to implement and quick, has insufficient performance compared with metric learning-based methods. Since it simply adds a function into the data assignment process of the k-means algorithm to check for constraint violations, it often exploits only a small number of constraints. Metric learning-based methods, which exploit constraints to create a new metric for data similarity, have shown promising results although the methods proposed so far are often slow depending on the amount of data or number of feature dimensions. We present a method that exploits the advantages of the constrained k-means and metric learning approaches. It incorporates a mechanism for accepting constraint priorities and a metric learning framework based on the boosting principle into a constrained k-means algorithm. In the framework, a metric is learned in the form of a kernel matrix that integrates weak cluster hypotheses produced by the constrained k-means algorithm, which works as a weak learner under the boosting principle. Experimental results for 12 data sets from 3 data sources demonstrated that our method has performance competitive to those of state-of-the-art constrained clustering methods for most data sets and that it takes much less computation time. Experimental evaluation demonstrated the effectiveness of controlling the constraint priorities by using the boosting principle and that our constrained k-means algorithm functions correctly as a weak learner of boosting.

A Case of Undifferentiated Sarcoma in the Superior Vena Cava and Bilateral Cervical Veins.

BACKGROUND Intimal sarcoma (IS) is a malignant mesenchymal tumor with predominantly intraluminal growth in large vessels and the heart. Due to the rarity of cases it often poses diagnostic problems in clinical and pathological settings. Although the classification of IS is still controversial, undifferentiated type of IS has recently been found to show immunohistochemical positivity with MDM2, CDK4, or PDGFRA and amplification of MDM2/CDK4 and PDGFRA. CASE REPORT The patient was a 76 years-old Japanese man who presented with superior vena cava (SVC) syndrome. CT identified a tumor or thrombi in the SVC, bilateral brachiocephalic, and jugular veins. The histology of the biopsy specimen revealed an undifferentiated tumor without immunohistochemical positivity for all antibodies available except vimentin and smooth muscle actin. He was treated conservatively and died of respiratory failure 2 months after presentation. At autopsy, the large veins were filled by a sausage-like tumor and the cut sections revealed hemorrhagic and necrotic tumor. The tumor cells were negative with MDM2, CDK4, and PDGFRA by immunohistochemistry. Amplification of MDM2 and PDGFRA was not identified by fluorescence in-situ hybridization. CONCLUSIONS We concluded that the case was an undifferentiated sarcoma (IS without any specific phenotype) arising in the SVC, bilateral brachiocephalic, and jugular veins. We propose a way of subtyping sarcomas with predominantly intraluminal growth in large vessels and the heart based on immunohistochemistry and amplification of MDM2 and PDGFRA. However, proper subtyping of these sarcomas requires further study.