insidious onset

Although 25 eyes presented with acute angle closure glaucoma , 6 eyes were insidious onset and asymptomatic.

虽然大多数的病例(25只眼)以急性发作为临床表徵, 但有6只眼为隐袭性,无任何临床症状.

——期刊摘选

The insidious onset and slow progression of symptoms usually result in delayed diagnosis.

由于发病时?状不明显且病程进展缓慢,通常造成诊断延误.

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