Distance between nasal base and midline upper lip vermilion border more than 2 SD below the mean. Alternatively, an apparently decreased distance between nasal base and midline upper lip vermilion border. The phenotype is Short philtrum (Human Phenotype Ontology identifier HP_0000322). Also known as: Decreased height of philtrum, Decreased length of philtrum, Decreased vertical dimension of philtrum, Vertical hypoplasia of philtrum.