A case of colon lipoma presenting with intussusception

　An 84-year-old man, who had been found to have a submucosal tumor in the ascending colon two years before, was admitted to our hospital for right lower quadrant abdominal pain and melena. An abdominal computed tomography (CT) scan showed intussusception in the ascending colon, resulting from a fat-density tumor. The intussusception was located by colonoscopy. Since the colonic tumor was enlarged in comparison with two years ago and had an ulcer at the top of the tumor, there was the possibility of malignancy and recurrence of intussusception. He underwent a laparoscopy-assisted right colectomy with lymph node dissection. Pathologically, the tumor of the ascending colon was a benign lipoma

A case of appendiceal diverticulum resected by laparoscopic surgery with preoperative diagnosis of appendiceal tumor

　Appendiceal diverticulum is rare. We encountered a case of appendiceal diverticulum with chronic appendicitis. A 56-year-old man presented to our hospital with right lower abdominal pain. An abdominal computed tomography (CT) scan showed swelling of the appendix body and the wall thickness of the base of the appendix. Due to the possibility of appendiceal tumor, we performed a laparoscopy-assisted ileocecal resection with lymph node dissection. The appendix had a diverticulum with chronic inflammation, but it did not have a neoplastic lesion

Solitary pancreatic metastasis from renal cell carcinoma.

A rare case of resectable solitary pancreatic metastasis from a renal cell carcinoma is reported. The patient was a 57-year-old man who presented with epigastralgia. He had undergone a radical nephrectomy of the right side 30 months previously. The diagnosis of pancreatic metastasis was based on the patient's past history and angiographic demonstration of typical hypervascular tumor staining. Histological examination was confirmatory. The patient was successfully treated by pancreaticoduodenectomy followed by alpha-interferon administration. As of 6 months after surgery, he remains well.</p

Small Intestinal Neuroendocrine Tumour Incidentally Diagnosed Along with Large Mesenteric Lymph Node Metastasis: A Case Report

Small intestinal neuroendocrine tumours (NETs) are rare malignancies that occur in the small intestine. The incidence of small intestinal NETs has increased substantially in recent decades. Similar to that of general NETs, the diagnosis rate of small intestinal NETs is increasing continuously. Small intestinal NETs often metastasize to the lymph nodes, even when the lesions are small. Surgical resection of the primary tumour and associated mesenteric lymph nodes is recommended. We present a case of a NET in the ileum that was incidentally diagnosed along with large mesenteric lymph node metastasis. Abdominal computed tomography for examination of urinary frequency revealed an intra-abdominal mass, measuring 80 mm in diameter. The patient was intraoperatively diagnosed with an ileocaecal mesenteric mass, and ileocaecal resection with lymph node dissection was performed. The resected specimen incidentally showed a NET measuring 14 mm in diameter in the ileum, located 90 cm from the ileocaecal valve. The ileocaecal mesenteric mass was histopathologically diagnosed as lymph node metastasis of the NET. This case confirms the importance of making an immediate intraoperative pathological diagnosis and performing a thorough examination of small intestinal lesions when a large mesenteric tumour is suspected

Competition between Osmotic Squeezing versus Friction-Driven Swelling of Gels

Some types of hydro-gels have almost the same equilibrium swelling volume in water and in ethylene glycol (EG), a highly viscous liquid completely miscible with water. Experiments showed that when a gel fully swollen with EG is immersed into a large amount of water, it temporarily swells up and then relaxes to the equilibrium volume in water. The temporary swelling is explained by the friction force exerted on the gel network from the outward EG flux In this paper, we experimentally show that the temporary swelling is suppressed by adding linear PEG (polyethylene glycol) in the outer water. Although the suppression seems to be explained by the osmotic pressure (i.e., by the same mechanism as the conventional osmotic squeezing), our theoretical analysis reveals that the effect of PEG is much stronger than that expected from the equilibrium osmotic pressure, implying that the PEG chains are condensed on the gel surface

Well-differentiated Endocrine Cell Carcinoma of Ileum Treated by Laparoscopy-assisted Surgery : A Case Report

A 72-year-old woman presented at our hospital with a 1-year history of intermittent right lower abdominal pain. Colonoscopic examination revealed a submucosal tumor with a pitted surface in the terminal ileum. Histopathological diagnosis of the carcinoid tumor was made following biopsy. Blood serotonin and urine 5-hydroxy-indoleacetic acid levels were normal, and carcinoid syndrome was not detected. Enhanced abdominal computed tomography scan and 18F-fluorodeoxyglucose positron emission tomography failed to detect multiple lesions, lymph node swelling or distant metastasis. Laparoscopy-assisted ileocecal resection with lymph node dissection was performed. The resected specimen showed a submucosal tumor with a pitted surface 11 x 11 mm in size, located at the terminal ileum. Histopathological examination revealed a well-differentiated endocrine cell carcinoma with an invasion depth to the muscularis propria. Immunohistochemical analysis showed the tumor cells to be chromogranin A and CD56-positive. The patient had no sign of recurrence for 16 months