def parse_rank_results_header(vcf_obj):
    """Return a list with the rank results header
    
    Check if the rank result is in the vcf header. If it exists return a list 
    with the rank results headers
    
    Args:
        vcf_obj(cyvcf2.VCF)
    
    Returns:
        rank_results_header(list)
    """
    rank_results_header = []
    
    if 'RankResult' in vcf_obj:
        rank_results_header = vcf_obj['RankResult']['Description'].strip('"').split('|')
    
    return rank_results_header