Lesione nodulare retroauricolare in un lattante

We reported a 5 month-old infant case, admitted to our institution for a retroauricular mass. We described our diagnostic approach and the differential diagnosis that was progressively excluded. Lesions of the skull were present as lumps on the head, and by a broad differential diagnosis they could be referred to as inflammatory, malformative, traumatic and neoplastic lesions, so clinical presentations and diagnostic imaging could be useful. In most of cases, biopsy is necessary to make a definitive diagnosis.