abnormal hindbrain size increased hindbrain size 2013-11-14T09:53:41Z MP:0012265 MPheno.ontology csmith enlarged hindbrain enlarged rhombencephalon expanded hindbrain expanded rhombencephalon greater than average size of the part of the brain developed from the posterior of the three primary brain vesicles of the embryonic neural tube from which the metencephalon and myelencephalon are derived increased rhombencephalon size