Chylous ascites

Chylous ascites is a rare condition characterized by the accumulation of chyle (a milky, lipid-rich lymphatic fluid) within the peritoneal cavity. It results from disruption or obstruction of the lymphatic system, leading to leakage of chyle from lymphatic vessels into the abdominal cavity. The condition can occur as a congenital or acquired disorder. Congenital chylous ascites, also known as congenital chyloperitoneum, typically presents in neonates or infants and may be associated with lymphatic malformations, intestinal lymphangiectasia, or primary lymphatic dysplasia. Acquired forms can result from abdominal surgery, trauma, malignancy (particularly lymphomas), cirrhosis, infections such as tuberculosis, or radiation therapy. The primary clinical features include progressive abdominal distension, abdominal discomfort or pain, and weight gain due to fluid accumulation. Patients may also experience malnutrition, failure to thrive (in children), dyspnea from increased abdominal pressure, and peripheral edema. Diagnosis is confirmed by paracentesis revealing a milky peritoneal fluid with elevated triglyceride levels (typically greater than 200 mg/dL) and a predominance of lymphocytes. Treatment depends on the underlying cause and severity. Conservative management includes dietary modification with a high-protein, low-fat diet supplemented with medium-chain triglycerides (MCTs), which are absorbed directly into the portal venous system rather than through lymphatics. Total parenteral nutrition may be required in severe cases. Octreotide, a somatostatin analogue, has been used to reduce lymphatic flow. Repeated therapeutic paracentesis may be necessary to relieve symptoms. In refractory cases, surgical intervention such as peritoneovenous shunting, ligation of leaking lymphatic vessels, or lymphovenous anastomosis may be considered. The prognosis varies widely depending on the etiology, with congenital forms sometimes resolving spontaneously in infants.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

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