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Images in paediatrics
Aplasia cutis with ‘hair collar sign’
  1. Andrea Bassi1,
  2. Antonella Greco2,
  3. Maurizio de Martino2
  1. 1 Division of Dermatology, Department of Critical Care Medicine and Surgery, University of Florence, Florence, Italy
  2. 2 Department of Health Sciences, Paediatric Section, Anna Meyer Children's University Hospital, Florence, Italy
  1. Correspondence to Dr Andrea Bassi, Division of Dermatology, Department of Critical Care Medicine and Surgery, University of Florence, Viale Michelangelo, Florence 11-50129, Italy; bassi76{at}interfree.it

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A 2-month-old boy was referred to our paediatric dermatological department with two adjacent oval patches of 2×3 cm in diameter, covered by a thin, atrophic, translucent membrane. The larger lesion was surrounded by tufts of darker terminal hair, that were horizontally arranged and oriented towards the periphery of the lesion, starting from the vertex (figure 1). There were no palpable underlying bone abnormalities. The infant was otherwise healthy. A MRI …

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