Final answer:
The misspelled medical term is Onephrosis, Correct spelling is Hydronephrosis.
Step-by-step explanation:
The misspelled medical term out of the given options is Onephrosis. The correct spelling of the term is Hydronephrosis. Hydronephrosis refers to the swelling of the kidney due to the buildup of urine, often caused by blockages or obstructions.
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