A recent study (L Li et al. J Pediatr 2015; 157: 1334-9) indicated that hypothyroidism may be another extrahepatic feature of patients with ATP8B1 deficiency; this mutation’s main manifestation has been intrahepatic cholestasis in either progressive familial intrahepatic cholestasis (PFIC type 1) or benign recurrent intrahepatic cholestasis (BRIC type 1).
In this study, 3/13 were hypothyroid and an additional 2/13 had subclinical hypothyroidism. These patients were compared with a cohort of children with ABCB11 deficiency (PFIC type 2 or BRIC type 2) in which 0/19 had hypothyroidism.
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