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• W2039845983 abstract "Pseudomyxoma peritonei is rare. The rarity is highlighted by the lack of published evidence regarding management. The latest treatments have altered the prognosis of a once incurable disease. This report serves to both raise awareness and critically appraise the literature regarding the latest management. A 75-year-old gentleman was referred to outpatient gastroenterology services due to a 3-month history of weight loss, abdominal pain, and abdominal distension. His past medical history was significant for atrial fibrillation, hypertension, bilateral knee replacements, and obstructive sleep apnoea. On presentation to the outpatient clinic, the patient appeared cachectic with marked abdominal distension. The patient denied significant alcohol consumption and a thorough history ruled out any risk factors for liver disease. He did, however, admit to increasing lethargy and malaise. Examination confirmed generalized muscle wasting; abdominal palpation revealed a huge epigastric mass and abdominal distension consistent with ascites. No signs of chronic liver disease were seen. The weight loss and ascites point toward a diagnosis of malignancy, possible disseminated. Isolated right or biventricular failure remains a possibility especially, given the associated lethargy. Although unlikely in the absence of signs of chronic liver disease and compatible history, decompensated liver disease remains in the differential diagnosis and was therefore investigated for Other rarer differentials encompass tuberculosis and sarcoidosis. In the author's experience, in a gentleman presenting with ascites, the “default” diagnosis appears to be decompensated alcoholic liver disease. Such stereotyping is unacceptable and undoubtedly results in missed diagnoses, poor clinical care, and is a source of anxiety and distress amongst patients. In this patient, a thorough alcohol consumption history and clinical examination by the admitting team helped avoid this. Blood investigations were essentially normal apart from a raised Ca19-9 (208) and CEA (88) levels. An ascitic tap revealed an almost gelatinous, straw-colored fluid. Cytological analysis of the fluid revealed the presence of foamy cytoplasm-containing mesothelial cells with eccentric nuclei (mucin-containing epithelial cells). A liver screen was negative. Computed tomography (CT) of the abdomen revealed extensive ascites and a large cystic tubular structure measuring 15 × 6 cm, consistent with an appendiceal mucocele (Fig. 1, coronal section). Further, sections of the CT scan (Sagittal and Transverse) revealed extensive omental caking in the epigastric region (Figs. 2 and 3). The patient underwent an extensive debulking operation; histology from peritoneal and adipose tissue revealed disseminated peritoneal adenomucinosis (DPAM). He has subsequently had heated intraperitoneal chemotherapy (HIPEC) (mitomycin C), and is in clinical remission. Pseudomyxoma peritonei (PMP) is a rare diagnosis with an incidence of 1–2 per million 1. Coined by Werth in 1884 2, PMP was initially thought of as a peritoneal reaction to the “jelly-like” secretions produced by an ovarian neoplasm 1. Points of contention as to the exact origin of this condition, especially in women, stem from the fact that synchronous appendiceal and ovarian disease is common and the overall female preponderance for PMP 3. Immunohistochemistry and molecular genetics have, however, lent strength to the current concept of an appendiceal origin for the vast majority of PMP in both men and women 1. Most cases originate from a minimally invasive mucinous epithelial neoplasm (as mentioned above primarily appendiceal but ovarian and colonic sources have also been described), which eventually ruptures and releases mucinous tumor cells into the peritoneal cavity 4. These cells show a high propensity for spread to peritoneal surfaces, but almost no lymphatic or hematogenous metastases 5. Accumulation and the reproduction of free and implanted tumor cells leads to progressive peritoneal mucinous tumor and ascites 4. The disease is characterized by diffuse intra-abdominal gelatinous collections (jelly belly) with mucinous implants on peritoneal surfaces and the omentum 4. The locoregional progression of the disease (redistribution phenomenon) 6 results in intestinal failure and malnutrition secondary to raised intra-abdominal pressure, fistula formation, and infection 7, hence the associated considerable mortality and morbidity. Ronnett et al. proposed three pathological subtypes of the condition 8. DPAM, a low-grade lesion with a good prognosis; peritoneal mucinous adenocarcinoma (PMCA), which is histopathologically a high-grade metastatic adenocarcinoma, usually derived from the appendix and colon, with a poor prognosis; and intermediate type PMP (PMCA-I), which includes lesions that demonstrate predominantly features of DPAM, but also contain focal areas of PMCA (intermediate prognosis) 9. Other classification systems exist but the one devised by Ronnett et al. is the most commonly used one. The imaging and staging modality of choice is abdominal CT scanning 10, with scalloping and characteristic patterns of disease on visceral surfaces being almost pathognomic of PMP. In most cases, the striking feature is the relative sparing of the small bowel and its mesentery, with the small bowel “compartmentalized” in the center of the abdomen by a large omental cake 11. Septa, curvilinear or amorphous calcification, areas of soft tissue attenuation due to solid elements within mucinous material and compressed mesentery are seen as the volume of disease increases 12. Lee et al. argue that due to high water content, mucin has a similar appearance to water on both CT and MR imaging, but when the mucin produced is thick and proteinaceous then it tends to be hyperdense compared to water and hyperintense on T1- and hypointense on T2-weighted images. The role of MR imaging in PMP is, however, yet to be established 13. Although anaemia is a common finding, laboratory studies are of very limited use in diagnosing PMP, with the definitive diagnosis usually being established at laparotomy 14. Tumor markers CEA, CA-19.9, and CA-125 are raised, the specificity and sensitivity of these markers in PMP has not been extensively studied and therefore their diagnostic utility in PMP is likely to be restricted at best. Baratti et al. however demonstrate a role for these markers in post-treatment prognostication. They reveal a correlation between a normal preoperative CA-125 with the likelihood of achieving adequate cytoreduction at surgery (a significant prognostic factor for PMP) and go on to suggest that an increased baseline CA19.9 is an independent inverse predictor of progression-free survival after treatment 15. Tumor markers can be used to monitor response to treatment and as surveillance tools to look for recurrence. The surgery is followed by HIPEC to eliminate microscopic and residual disease (http://publications.nice.org.uk/complete-cytoreduction-for-pseudomyxoma-peritonei-sugarbaker-technique-ipg56). This remains the best treatment regime in patients medically fit enough. No clear strategy exists for patients not fit enough to undergo this complex and aggressive treatment; palliative interval debulking appears to be the favored option here, however there may be a role for systemic chemotherapy as well. Technically a demanding procedure, requiring specialized equipment, the Sugarbaker procedure is not without reasonable postoperative morbidity and mortality 1, Major morbidity includes anastomotic leakage, enteric and pancreatic fistulation, pneumonia, thromboembolism, and intra-abdominal abscesses 16. Morbidity from intraperitoneal chemotherapy (mitomycin C), takes the form of septic sequelae especially neutropenic sepsis 17. Glehen et al. 18 report a median survival of 156 months, with 5- and 10-year survival of 72% and 55%, respectively, in 501 PMP patients who had undergone CRS (complete and incomplete) followed by HIPEC. The majority (~70%) had complete cytoreduction. This uniform treatment approach has shown improved 10-year survival, as compared with historical controls 19, 20. Overall, however, long-term survival rates remain poor with 5 and 10-year survival rates of 50% and 10–30%, respectively 20-22. None declared." @default.
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• W2039845983 title "A rare cause of ascites: pseudomyxoma peritonei and a review of the literature" @default.
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