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Review Question - QID 108861

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QID 108861 (Type "108861" in App Search)
A 12-year-old boy is found on a routine auditory screening to have mild high frequency hearing impairment. On exam, he has no ear pain, no focal neurological deficits, and no cardiac murmurs. He has not had any recent illness. Laboratory studies show:

Serum:
Creatinine: 0.7 mg/dl
Protein: 3.8 g/dl
Antistreptolysin O titer: 60 Todd units (12-166 normal range)

Urinalysis:
Microscopic heme
Protein: 2+
RBCs: 6/hpf

A kidney biopsy is taken. Which of the following findings is most characteristic of this patient’s disease?