Of the 21 patients conservatively treated between 1975 and 1997, 12 had diffuse disease (homozygous mutant alleles) and 9 had presumed focal disease (paternal mutant allele only).

• 1975年至1997年期间接受保守治疗的21例患者中，12例为弥漫性病变（等位基因突变纯合子），9例为局灶性病变（仅父系等位基因突变）。