LAUSR

© BMJ Publishing Group Limited 2022. No commercial reuse. See rights and permissions. Published by BMJ. DESCRIPTION A man in his 80s presented to the emergency department overnight with a 5hour history of sudden onset severe abdominal pain radiating through to the back associated with nausea. Relevant medical history included a previous right inguinal hernia repair and known sigmoid cancer for which he was awaiting a sigmoid colectomy. He was on no regular medications. Baseline bloods were unremarkable apart from a mildly raised white cell count of 10.24×10/L. C reactive protein and amylase were both normal. Venous blood gas analysis demonstrated lactate of 4.5 mmol/L. Emergency CT scanning demonstrated small bowel volvulus with a double twist of the superior mesenteric artery, associated with radiographic evidence of early small bowel ischaemia. He was taken to the theatre for an emergency laparotomy. On initial inspection of the abdominal contents, it was noticed that the affected section of the small bowel mesentery had a striking white liquid within the mesentery (figure 1). This milky liquid was only present in the twisted section and could easily be ‘milked’ around the mesentery. There were also small quantities of this same milky liquid pooling freely within the abdomen. Samples of this fluid were taken for cytology, MC+S (Microscopy, Culture and Sensitivity) and lipid analysis (results found in table 1). The twisted section of the small bowel was viable when untwisted, so no bowel resection was performed. The laparotomy wound was closed with a drain left in the patient’s pelvis. The drain was removed 2 days after the procedure and the patient was discharged 9 days later. The analysis of the fluid, as seen in table 1, is consistent with chyle due to the exceptionally high lipid content. Reviewing the literature, there are many case reports which describe chylous ascites (free chyle within the abdomen) as a result of small bowel volvulus. However, the presence of chyle within the mesentery during small bowel volvulus is a very rare occurrence with only five cases described. During the literature search, there was no specific research focussing on the aetiology of chyle infiltration within the mesentery. However, Bhardwaj et al considered the aetiologies of chylous ascites which could be used to propose the aetiology of the mesenteric chyle infiltration. Bhardwaj et al proposed that there were two main mechanisms by which chylous ascites occurred. The first mechanism was that elevated lymphatic pressures (caused by pathologies such as portal hypertension, increased lymphatic production or lymphatic obstruction) can cause serosal and endothelial compromise resulting in chyle leakage. The second mechanism was a direct breach of the lymphatic wall (such as trauma or fistulae) causing chyle leakage. During small bowel volvulus, there would be a localised lymphatic obstruction which could cause chyle leakage into the mesentery by compromising the integrity of the serosa and endothelium of the mesenteric lymphatics via increased lymphatic pressure. This case, supported by photographic evidence, is a further example of how small bowel volvulus can result in chyle infiltration within the mesentery. As in other similar case reports, the patient received Figure 1 Mesentery with chyle infiltration.