Transmural spread by colorectal carcinoma can result in tumor invasion of the serosal surface and, hence, more likely dissemination within the peritoneal cavity and potentially to additional metastatic sites. The adverse prognostic significance of serosal invasion is widely accepted and its presence may be considered an indication for chemotherapy in patients with node negative disease. However, controversy persists regarding the most appropriate criteria for diagnosis and there are also practical difficulties associated with histological assessment in some cases. Therefore, serosal invasion may be under-diagnosed in a significant proportion of tumors, potentially leading to sub-optimal treatment of high-risk patients. The examination of multiple microscopic sections combined with ancillary studies such as cytology preparations, elastin stains, and immunohistochemistry may prove beneficial in selected problematic cases, but these are not used routinely. The relative prognostic significance of serosal invasion and of direct tumor spread to other organs, both of which are incorporated within the pT4 category of the AJCC/UICC TNM staging system, remains unclear. Further studies are required to demonstrate whether recent adjustments to the TNM staging of pT4 tumors are appropriate.
A normal full-term baby boy, born by vaginal delivery, became ill on day 2 with fever and failure to feed. CSF examination revealed 260 x 10(6)/l leucocytes, mainly mononuclears, protein 2 g/l and glucose zero. Pasteurella multocida was isolated in pure culture from the baby's CSF, blood and umbilicus and from the mother's vagina. The baby was treated with i.v. penicillin for 7 weeks. Progress was complicated by mild hydrocephalus, which resolved, and prolonged low grade fever. Recovery was complete, without neurological sequelae. This case illustrates that P. multocida can infect the vagina where it presents a hazard to a newborn infant delivered vaginally. Early diagnosis is critical, intravenous high dose penicillin being the treatment of choice.
Tumour regression grade after neoadjuvant CRT was an independent prognostic factor for RFS, highlighting the importance of the degree of local response to CRT.
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