One decade ago, the diagnostic criteria for three major forms of primary progressive aphasia (PPA) — nonfluent‐agrammatic variant (nfvPPA), semantic variant (svPPA), and logopenic variant (lvPPA) — have been established based on expert consensus [1]. However, non‐canonical forms of PPA (i.e., dynamic aphasia, pure apraxia of speech, pure anomia, dysprosodia) [2] and some features such as echolalia (repetition of what one has just heard) tend to be underestimated.

中文翻译：

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Echolalia：注意被遗忘的原发性进行性失语症的临床特征

十年前，三种主要形式的原发性进行性失语症 (PPA) 的诊断标准——非流利语法变体 (nfvPPA)、语义变体 (svPPA) 和 logopenic 变体 (lvPPA)——已根据专家共识确立 [1] . 然而，PPA 的非规范形式（即动态失语症、纯粹的言语失用症、纯粹的失语症、发音障碍）[2] 和一些特征，如回声（重复刚刚听到的内容）往往被低估。