Final answer:
The primary accent in the pronunciation of 'Hydronephrosis' falls on the syllable 'DRO' with the secondary accent on 'HY'.
Step-by-step explanation:
In the medical term Hydronephrosis, the primary accent falls on the syllable DRO. The syllable HY receives secondary accent. The pronunciation is as follows: HY-dro-ne-PHRO-sis.
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