material anatomical entity hilum An anatomical cavity, depression or pit where structures are attached. Wikipedia:Hilum_of_kidney_of_lung_of_lymph_node hilus uberon UBERON:0004885 galen:Hilum NCIT:C73467 UMLS:C0929176 UBERON:0004460 Galen and NCITA refer to the generic structure FMA:57836