Low Gamma-Glutamyl Transferase Cholestasis in a Patient With X-Linked Myotubular Myopathy and Crohn's Disease.

X-linked myotubular myopathy (XLMTM) is a neuromuscular disorder manifesting at birth with hypotonia and respiratory distress. We describe the XLMTM case presenting at birth who developed normal gamma-glutamyl transferase cholestasis at 1 year of age. He was also diagnosed with Crohn's disease 4 years later. His cholestasis could be attributed to progressive familial intrahepatic cholestasis (PFIC) or primary sclerosing cholangitis in the setting of Crohn's disease. However, genetic testing ruled-out PFIC, and his radiographic and liver biopsy findings were not suggestive of primary sclerosing cholangitis. We believe that this cholestasis is related to XLMTM leading to a PFIC-like state.