Acute Tubulointerstitial Nephritis due to Human Papillomavirus Vaccination.

Acute tubulointerstitial nephritis (ATIN), a rare cause of acute kidney injury in children, is caused by various factors such as drugs, infection, and systemic inflammation. We herein present a case of ATIN with mild encephalitis/encephalopathy with reversible splenial lesion (MERS)-like findings on head magnetic resonance imaging (MRI), which was associated with human papillomavirus (HPV) vaccination. A 14-year-old girl presented to our hospital with a high fever for 5 days. Results of common laboratory tests were normal except for increased C-reactive protein (CRP) levels and erythrocyte sedimentation rate (ESR). Antibiotics were administered, and the fever promptly resolved after admission. After 7 weeks, she was readmitted due to a high fever for 4 days. In addition to increased CRP levels and ESR, urine test revealed high urine N-acetyl-β-D-glucosaminidase and β-2-microglobulin levels, and a renal scintigram showed mild bilateral uptake of 67Ga-citrate, consistent with the pathology of ATIN. Furthermore, head MRI, which was performed because the patient experienced prolonged headaches, revealed MERS-like lesions, although she did not have other neurological symptoms. Detailed examination of her medical records revealed that she had developed high fever 10 days after the third HPV vaccination and another previous episode of high fever 12 weeks after the second HPV vaccination. Based on these findings, we concluded that the ATIN and MERS-like lesions could have been associated with HPV vaccination. Although HPV vaccination is important for preventing uterine cancer, physicians must be vigilant about its various potential adverse effects, including ATIN.