BACKGROUND: Xanthogranulomatous cholecystitis (XGC) is a rare presentation of chronic cholecystitis, characterized by xanthogranuloma, severe fibrosis and foam cells, and can be a cause of difficulty in cholecystectom...BACKGROUND: Xanthogranulomatous cholecystitis (XGC) is a rare presentation of chronic cholecystitis, characterized by xanthogranuloma, severe fibrosis and foam cells, and can be a cause of difficulty in cholecystectomy. Patients with XGC are frequently misdiagnosed intraoperatively as having carcinoma of the gallbladder and are treated with extensive excision. This study aimed at providing proper surgical treatment for patients with XGC. METHODS: The clinical data of 33 patients with XGC definitely diagnosed by pathological examination over a period of 10 years were analyzed retrospectively (mean age of onset, 60 years; male/female ratio, 1.5: 1). RESULTS: Preoperatively, the 33 patients were examined by abdominal B-ultrasonography while 20 of them were further examined by computed tomography (CT). Intraoperatively, XGC associated with cholecystolithiasis was found in 97.0% of the patients, thickening of the gallbladder wall in 90.9%, xanthogranulomatous tissue invading into other tissues in 87.9%, XGC associated with choledocholithiasis in 15.2%, and Mirizzi syndrome in 9.1%. In addition, a gallbladder fistula was observed in 4 patients. Open cholecystectomy was performed on 15 patients, partial cholecystectomy on 7, cholecystectomy and partial liver wedge resection on 5, and gallbladder cancer radical correction on 6. The intraoperative misdiagnosis rate was 24.2%. Frozen-section examination was carried out in 9 patients. Postoperative complications were observed in 5 patients. CONCLUSIONS: XGC is difficult to diagnose either preoperatively or intraoperatively and definite diagnosis depends exclusively on pathological examination. Firm adhesions of the gallbladder to neighboring organs and tissues are common and lead to difficulty in surgical treatments. The mode of operation depends on specific conditions in varying cases, and since frozen-section examination plays an important role in determining the nature of the lesions, intraoperative frozen-section examination should be carried out to differentiate XGC from carcinoma of the gallbladder.展开更多
The unsymmetrical bis-Schiff base manganese（III） and cobalt（II） complexes with either benzo-10-aza-crown ether pendants （MnL1Cl, MnLZCl） or morpholino pendant （MnL3Cl, CoL3） have been employed as models for hy...The unsymmetrical bis-Schiff base manganese（III） and cobalt（II） complexes with either benzo-10-aza-crown ether pendants （MnL1Cl, MnLZCl） or morpholino pendant （MnL3Cl, CoL3） have been employed as models for hy- drolase by studying the kinetics of their hydrolysis reactions with p-nitrophenyl picolinate （PNPP）. A kinetic model of PNPP cleavage catalyzed by these complexes is proposed. The effects of complex structures and reaction temperature on the rate of PNPP hydrolysis have been examined. All four complexes exhibit high catalytic activity and the rate increases with pH under 25℃. The complexes of ligands containing a crown ether group exhibit higher catalytic activities than the non-crown analogues. The catalytic activity of the complexes follows the order Mn（III） 〉 Co（II） under the same ligands.展开更多
文摘BACKGROUND: Xanthogranulomatous cholecystitis (XGC) is a rare presentation of chronic cholecystitis, characterized by xanthogranuloma, severe fibrosis and foam cells, and can be a cause of difficulty in cholecystectomy. Patients with XGC are frequently misdiagnosed intraoperatively as having carcinoma of the gallbladder and are treated with extensive excision. This study aimed at providing proper surgical treatment for patients with XGC. METHODS: The clinical data of 33 patients with XGC definitely diagnosed by pathological examination over a period of 10 years were analyzed retrospectively (mean age of onset, 60 years; male/female ratio, 1.5: 1). RESULTS: Preoperatively, the 33 patients were examined by abdominal B-ultrasonography while 20 of them were further examined by computed tomography (CT). Intraoperatively, XGC associated with cholecystolithiasis was found in 97.0% of the patients, thickening of the gallbladder wall in 90.9%, xanthogranulomatous tissue invading into other tissues in 87.9%, XGC associated with choledocholithiasis in 15.2%, and Mirizzi syndrome in 9.1%. In addition, a gallbladder fistula was observed in 4 patients. Open cholecystectomy was performed on 15 patients, partial cholecystectomy on 7, cholecystectomy and partial liver wedge resection on 5, and gallbladder cancer radical correction on 6. The intraoperative misdiagnosis rate was 24.2%. Frozen-section examination was carried out in 9 patients. Postoperative complications were observed in 5 patients. CONCLUSIONS: XGC is difficult to diagnose either preoperatively or intraoperatively and definite diagnosis depends exclusively on pathological examination. Firm adhesions of the gallbladder to neighboring organs and tissues are common and lead to difficulty in surgical treatments. The mode of operation depends on specific conditions in varying cases, and since frozen-section examination plays an important role in determining the nature of the lesions, intraoperative frozen-section examination should be carried out to differentiate XGC from carcinoma of the gallbladder.
文摘The unsymmetrical bis-Schiff base manganese（III） and cobalt（II） complexes with either benzo-10-aza-crown ether pendants （MnL1Cl, MnLZCl） or morpholino pendant （MnL3Cl, CoL3） have been employed as models for hy- drolase by studying the kinetics of their hydrolysis reactions with p-nitrophenyl picolinate （PNPP）. A kinetic model of PNPP cleavage catalyzed by these complexes is proposed. The effects of complex structures and reaction temperature on the rate of PNPP hydrolysis have been examined. All four complexes exhibit high catalytic activity and the rate increases with pH under 25℃. The complexes of ligands containing a crown ether group exhibit higher catalytic activities than the non-crown analogues. The catalytic activity of the complexes follows the order Mn（III） 〉 Co（II） under the same ligands.
