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Skin‐coloured lumps in childhood

Skin biopsy from a lesion on the left arm showed sheets of polygonal cells in the dermis with granular eosinophilic cytoplasm and small rounded nuclei (Fig. 2). Stains for S-100 were positive (Fig. 3). Full blood count, renal and liver profiles were normal. Computerized tomography (CT) scan of the thorax was normal, but abdominal CT scan revealed thickening and inflammation of the rectal wall with free fluid around the rectum. Colonoscopy, examination under anaesthesia and rectal biopsy were normal. Magnetic resonance imaging (MRI) of the patient’s lower abdomen and rectum to reassess these findings was also normal.