Retroauricular Kimura Disease in a Young European Female: A Rare Case and Review of the Literature.

Background: Kimura disease (KD) is a rare benign disorder usually presenting in young Asian males as a subcutaneous mass in the head and neck. Common histological findings include lymphoid follicular hyperplasia, eosinophilic infiltrates, and vascular proliferation. Non-endemic presentations, particularly in women, are rare. Methods: We report a case of isolated retroauricular KD in a 28-year-old White woman with a 3-year history of an isolated, enlarging, mildly painful retroauricular mass, accompanied by peripheral eosinophilia and elevated serum immunoglobulin E (IgE) levels. The mass was resected, imaging showed no other sites of concern, and there was no recurrence. Results: Histopathologically, eosinophilic microabscesses, prominent vascular proliferation, and lymphoid follicular hyperplasia with CD20+ B cells, CD3+ T cells, and preserved CD23+ follicular dendritic networks were identified. Conclusions: A diagnosis of angiolymphoid hyperplasia with eosinophilia (ALHE) was excluded, and a final diagnosis of KD was established.