The short anagen syndrome (SAS) is a rare idiopathic pediatric disorder characterized by the short duration of the anagen phase. SAS mainly affects Caucasian children. Parents complain of their child's inability to grow long hair. Topical minoxidil may be an effective treatment for SAS; however, a slow spontaneous improvement is typical.

中文翻译：

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短生长期综合征：病例系列和诊断算法

短生长期综合征 (SAS) 是一种罕见的特发性儿科疾病，其特征是生长期持续时间短。SAS 主要影响白人儿童。父母抱怨他们的孩子无法长出长头发。外用米诺地尔可能是 SAS 的有效治疗方法；然而，缓慢的自发改善是典型的。