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An 81-year-old female was referred to our department 1 year ago due to a worsening renal function. Her manifestations met the criteria of Sjögren syndrome, suggesting renal failure likely resulting from tubulointerstitial nephritis (TIN) due to Sjögren syndrome. However, at her request, she was followed up with no further investigation or treatment. The following July, since her renal function deteriorated again, a renal biopsy was performed. Using IgM-CD138 dual staining, the renal pathology showed the infiltration of accumulated IgM-positive plasma cells within the renal insterstitium, so she was diagnosed with tubulointerstitial nephritis with IgM-positive plasma cells (IgMPC-TIN).IgMPC-TIN, proposed by Takahashi et al. in 2017, as a type of TIN, is characterized by the pathological infiltrations of IgM-positive plasma cells within the renal insterstitium and is effectively treated with corticosteroid therapy. Despite her old age, corticosteroid therapy was performed, resulting in the improvement in her renal function according to blood and urine tests and an improved pulmonary involvement, although renal dysfunction remained.Elderly patients often have multiple underlying medical conditions and take numerous medications, so differentiating renal disorders is challenging. However, a renal biopsy, even in an elderly patient, can aid in identifying the cause of renal disorders and predicting the prognosis. IgMPC-TIN is a condition in which renal function can be expected to improve if treated. It is thus important to make a diagnosis of IgMPC-TIN without overlooking and to consider proper treatment.

Tubulointerstitial nephritis with IgM-positive plasma cells in an elderly woman diagnosed by a renal biopsy and treated with corticosteroid therapy