Hair follicle neoplasms occur in many different species, including humans. In domestic animals, they are most common in dogs. Most hair follicle tumors are benign, but malignant neoplasms can also occur. To diagnose hair follicle neoplasms, a thorough knowledge of follicular anatomy is important, given that follicular tumors are classified according to the differentiation pattern seen in the corresponding part of the normal hair follicle. This review focuses on the key diagnostic features of hair follicle tumors and follicular cysts in dogs and cats.

中文翻译：

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狗和猫毛囊肿瘤和囊肿的组织学特征：诊断指南

毛囊肿瘤发生在许多不同的物种中，包括人类。在家畜中，它们最常见于狗。大多数毛囊肿瘤是良性的，但也可能发生恶性肿瘤。为了诊断毛囊肿瘤，全面了解毛囊解剖学非常重要，因为毛囊肿瘤是根据正常毛囊相应部分的分化模式进行分类的。本综述重点关注狗和猫毛囊肿瘤和毛囊囊肿的关键诊断特征。