I am not a specialist in medical translation, but "area of induration" is by far the most common collocation in the autopsy reports I have browsed. "Outbreak" may be the dictionary equivalent of the Romanian word, but if so, I suspect that only a particular sense of the English word "outbreak" is involved here: namely, a visible manifestation.

In principle, an autopsy report states what the pathologist observes. It therefore tends to record visible phenomena, not processes. If evidence of induration can be observed, it can be deduced that before death induration took place, but normally the evidence will be recorded, rather than the deductions to be drawn from it. This, I think, is why, when induration is mentioned, reference is nearly always made to an area of induration, or a certain number of millimeters of induration. Just look at these Google results:
https://www.google.es/search?num=100&q="of induration" "auto...

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Note added at 2 hrs (2014-02-12 13:45:48 GMT)
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You can best judge whether the Romanian word clearly means that the induration was in an early stage, but unless it does, I think it's probably unsafe to assume this. If the area of induration is very small, perhaps it might indicate onset. I really don't know whether this can be reliably determined in an autopsy. But in any case, the pathologist would more probably just state the size of the area.