MONDO_0016903 (partial deletion of the long arm of chromosome 4) can be described as follows. Chromosome 4q deletion is a chromosome abnormality that affects many different parts of the body. People with this condition are missing genetic material located on the long arm (q) of chromosome 4 in each cell. The severity of the condition and the associated signs and symptoms vary based on the size and location of the deletion and which genes are involved. Common features shared by many people with this deletion includedistinctive craniofacial features, skeletal abnormalities, heart defects, intellectual disability, developmental delay, and short stature. Most cases are not inherited, although affectedpeople can pass the deletion on to their children. Treatment is based on the signs and symptoms present in each person. Also known as: partial deletion of chromosome 4q, partial deletion of the long arm of chromosome type 4, partial monosomy of chromosome 4q, partial monosomy of the long arm of chromosome 4.