MBTPS2 and apolipoprotein A-I deficiency: Here, we report a patient with BRESHECK syndrome with the novel features of chronic diarrhea, anemia, bone marrow fibrosis, hypertriglyceridemia, hypobetalipoproteinemia, and hypoalphalipoproteinemia found by research‐based exome sequencing to harbor a novel Val256Leu MBTPS2 variant.