A cytogenetic abnormality that refers to the allelic loss of all or part of the short arm of chromosome 12. The disease is MONDO_0022174 (chromosome 12p deletion). Also known as: partial deletion of chromosome 12p, partial deletion of the short arm of chromosome 12, partial deletion of the short arm of chromosome type 12, partial monosomy of chromosome 12p, partial monosomy of the short arm of chromosome 12.