brachycephaly, trichomegaly, and developmental delay (Monarch Disease Ontology identifier MONDO_0044311) can be described as follows. BTDD is an autosomal dominant disorder characterized by brachycephaly, trichomegaly, and developmental delay. Although it is caused by dysfunction of the ribosome, patients do not have anemia (summary by {2:Paolini et al., 2017}).