Comparison of three separate antiadhesive barriers for intraperitoneal onlay mesh hernia repair in an experimental model.

BACKGROUND: Adhesion formation is a common adverse effect in intraperitoneal onlay mesh (IPOM) surgery. Different methods of adhesion prevention have been developed, including coated meshes and separate antiadhesive barriers (SABs). In this study one type of mesh was tested with different SABs, which were fixed to the sutured mesh using fibrin sealant. The primary aim was to compare adhesion prevention between different SABs. Secondary aims were the assessment of tissue integration and evaluation of SAB fixation with fibrin sealant. METHODS: Thirty-two rats were randomized to one of three treatment groups (SurgiWrap, Prevadh and Seprafilm) or a control group (no SAB). Animals were operated on with an open IPOM technique (8 per group). One macroporous polypropylene mesh per animal (2 × 2 cm) was fixed with four non-absorbable sutures. An antiadhesive barrier of 2·5 × 2·5 cm was fixed with fibrin sealant. After 30 days, adhesion formation, tissue integration, seroma formation, inflammation and vascularization were evaluated macroscopically and by histology. RESULTS: Prevadh and Seprafilm groups showed a significant reduction in adhesion formation compared with the control group. Tissue integration of the mesh was reduced in these groups. Fibrin sealant fixed the SAB to the mesh securely in all groups. CONCLUSION: Prevadh and Seprafilm are potent materials for the reduction of adhesion formation. A potential relationship between effective adhesion prevention and impaired tissue integration of the implant was observed. Fibrin sealant proved an excellent agent for SAB fixation.

Ki-1-positive large cell lymphoma. A clinicopathologic study of 41 cases.

We report the clinicopathologic findings of 41 patients with Ki-1 (CD30)-positive large cell lymphoma. The median age was 50 years; 13 patients were under 40 years of age. Ten patients presented with extranodal disease. Fifty-five percent of the patients presented with stage I or II disease, and bone marrow involvement was histologically documented in 30% and occurred exclusively in patients over 40 years of age. Two cytomorphologically distinct groups of Ki-1--positive large cell lymphomas could be separated. Group A lymphomas consisted of pleomorphic large cells, sometimes with wreathlike and embryo-like nuclei, whereas group B lymphomas displayed a rather monomorphic appearance. Clinically the two groups of lymphomas differed with respect to stage of disease, frequency of bone marrow involvement, and median survival. On paraffin sections, the Ki-1--related antibody Ber-H2 provided excellent staining results in all cases. Immunologic phenotyping disclosed a T cell type in the majority of cases, revealed marked loss of differentiation antigens, and frequent expression of HLA-DR and IL-2 receptor. The overall median survival was 13 months. Age below 40 years, limited stage of disease (I and II), and, although not statistically significant, lymphoma morphology were associated with longer survival. We conclude, that Ki-1--positive large cell lymphomas represent a morphologically and immunologically heterogeneous category of hematolymphoid neoplasms derived from dedifferentiated and activated lymphoid cells with marked age-dependent prognosis.

Unorthodox diagnostic procedure in a rare case of intrapericardial malignant schwannoma.

To establish preoperatively the cytology of a large right atrial tumour, an echoguided transcutaneous thin needle aspiration using a transhepatic approach was performed. Cytology suggested myxoma, which had been mimicked by regressive changes within the tumour, while the histologic examination of the removed specimen revealed a malignant pericardial Schwannoma. In spite of this discrepancy we think that solid tumours located at the free atrial wall are accessible to ultrasound guided puncture without great risk.