Cholestasis-lymphedema syndrome (Aagenaes syndrome): A Patient Guide

Cholestasis-lymphedema syndrome, also known as Aagenaes syndrome or LCS1, is an exceptionally rare genetic condition that primarily affects the liver and the lymphatic system. For parents, the diagnosis often unfolds in two distinct stages: it begins in infancy with a backup of bile in the liver (cholestasis) and later often involves persistent but variable swelling in the legs (lymphedema) ^[1]. This dual nature is associated with variants in the UNC45A gene, which disrupts how cells move materials and maintain their structure in both the liver’s bile ducts and the body’s fluid-drainage network ^[2].

In the first weeks of life, the focus is almost entirely on the liver. Because neonatal cholestasis can look like many other conditions, the most critical step for doctors is ruling out urgent issues like Biliary Atresia, which requires time-sensitive surgical intervention ^[3].

ACT NOW: Urgent Warning Signs in Infants
If your infant has prolonged jaundice, dark urine, or pale/white stools, or develops a fever, marked sleepiness, or bleeding, contact your treating team or urgent services promptly. A biallelic UNC45A genetic result does not replace urgent assessment for biliary atresia, infection, or other treatable causes.

Once Aagenaes syndrome is identified, care includes supporting the liver’s function. While the jaundice and bile backup often improve or even disappear as a child grows, the liver still requires careful monitoring and proactive nutritional support to ensure the body can absorb essential fat-soluble vitamins ^[4].

As your child moves into childhood or adolescence, the lymphatic part of the syndrome may become more visible, though the timing varies and some diagnosed children never develop visible swelling. The same genetic association that affected the liver also prevents the lymphatic vessels in the legs from draining fluid efficiently, leading to often persistent swelling ^[1]. Managing this requires a shift in daily routine to include specialized skin care and compression therapy. Consistent care is vital because it not only manages the swelling but also protects the skin from serious infections, which are more common in limbs where lymph fluid has pooled ^[5].

Living with Aagenaes syndrome means building a long-term partnership with a multidisciplinary team of specialists who understand the unique connection between the liver and the limbs. While the condition is lifelong, many reported patients maintain stable liver function and lead active lives ^[4]. By focusing on early nutritional support and establishing a consistent routine for lymphatic health, you can help your child navigate the challenges of this rare condition with confidence and resilience ^[6].