Fatty Gut Needs Low-Fat Formula
Primary intestinal lymphangiectasia (PIL) is a rare disorder characterized by the dilation of intestinal lacteals, which leads to the leakage of lymph into the small bowel lumen. This condition is responsible for protein-losing enteropathy, resulting in lymphopenia, hypoalbuminemia, and hypogammaglobulinemia. The etiology and prevalence of PIL remain unknown, and it affects males and females equally without any racial predisposition. There is no specific treatment for PIL, but fat restriction forms the cornerstone of management. This article presents a detailed case study of a 5-month-old infant diagnosed with PIL and discusses the diagnostic process, treatment approach, and outcomes.
The case involves a 5-month-old infant who presented with chronic diarrhea and severe failure to thrive since the age of one month. The mother described the diarrhea as cheesy and foul-smelling, with the infant experiencing ten loose bowel movements per day. This was associated with significant weight loss. Physical examination revealed that the infant’s weight and height were both below the fifth percentile for age. The infant appeared wasted, with no subcutaneous fat tissues visible. Laboratory studies showed a hemoglobin level of 102 g/L (reference range: 122–153 g/L) and a serum albumin level of 19 g/L (reference range: 35–55 g/L). Other parameters, including white blood cell count, platelet count, C-reactive protein, bilirubin, alkaline phosphatase, alanine transaminase, and aspartate aminotransferase, were within normal ranges. Stool analysis revealed the presence of many fat droplets, but stool culture results were negative. The random stool alpha-1-antitrypsin level was 3.7 mg/g (reference range: 0–0.5 mg/g).
Esophagogastroscopy was performed, revealing edematous duodenal mucosa with scattered whitish spots. A histopathologic biopsy of the duodenum showed dilated lymphatics, confirming the diagnosis of PIL. The diagnosis was based on the patient’s history, physical examination, hypoalbuminemia, positive stool alpha-1 antitrypsin, and histopathology findings.
The treatment approach for this infant involved the initiation of a medium-chain triglyceride (MCT)-based diet (Monogen formula) and fat restriction. Monogen is a nutritionally complete, low-fat, whole whey protein powdered feed that is low in long-chain triglycerides and high in MCT. It is also supplemented with docosahexaenoic acid and arachidonic acid. The need for dietary control in PIL appears to be permanent, as clinical and biochemical findings tend to reappear after the withdrawal of a low-fat diet. After three months of treatment, the infant showed significant improvement, with weight gain and a reduction in diarrhea. Follow-up laboratory findings, including serum albumin and stool alpha-1-antitrypsin levels, normalized.
PIL is an extremely rare disorder characterized by the dilation of intestinal lacteals, leading to lymph leakage into the small bowel. It can be classified into primary and secondary forms. Primary PIL can occur as an isolated disorder from birth or as part of syndromes such as Noonan, Klippel-Trenaunay-Weber, von Recklinghausen, Hennekam, and yellow nail syndrome. Secondary intestinal lymphangiectasia occurs as a complication of other disease states, including constrictive pericarditis, lymphoma, sarcoidosis, scleroderma, Whipple’s disease, and Crohn’s disease.
There is no specific treatment for PIL, and fat restriction forms the cornerstone of management. The absence of fat in the diet prevents the engorgement of intestinal lymphatics with chyle, thereby preventing their rupture and subsequent protein and T-cell loss. A low-fat diet supplemented with MCT is the mainstay of treatment for PIL. MCTs are directly absorbed into the portal venous system, which prevents lacteal engorgement. In cases where the disease involves a localized segment of the bowel, small bowel resection may be beneficial. Other treatment options described in the literature include octreotide, antiplasmin (tranexamic acid), and corticosteroids, but there is insufficient data to support their use.
The case highlights the importance of early diagnosis and appropriate dietary management in the treatment of PIL. The infant’s clinical and biochemical improvements following the initiation of a low-fat, MCT-based diet underscore the effectiveness of this approach. However, the need for permanent dietary control suggests that long-term management is essential to prevent the recurrence of symptoms.
In conclusion, PIL is a rare disorder that requires a comprehensive diagnostic approach, including clinical evaluation, laboratory tests, and histopathologic examination. The cornerstone of treatment is a low-fat diet supplemented with MCTs, which has been shown to improve clinical outcomes in patients with PIL. Further research is needed to explore additional treatment options and to better understand the etiology and prevalence of this condition.
doi.org/10.1097/CM9.0000000000000258
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