Diagnostic, therapeutic and prognostic challenges in a jaundiced patient treated with a checkpoint inhibitor.

Immune check point inhibitors (CPI) are now standard treatment for numerous metastatic malignancies. They are associated with hepatological adverse reactions, the most common of which is immune related hepatitis (irH). Bile duct injury is rarely described. We present the case of a 42 year old male with metastatic non-small cell lung cancer (NSCLC) treated with atezolizumab who developed severe liver dysfunction with biochemical and radiological features of a cholangiopathy. Establishing the final diagnosis proved exceptionally difficult due to multiple potential aetiologies. In this article the diagnostic, prognostic and management challenges including the role of liver biopsy, biliary drainage and immune suppression are explored. Cholangiopathy related to CPI is an emerging clinical entity that requires coordinated, expert care and further research.