(BMJ)—A child presented with this firm, immobile, and painless lump over the right eyebrow. The lump wasn't warm to touch. It had developed gradually following an injury to the area 3 months previously and had persisted despite topical antibiotics. What's the dx?
frontal sino-cutaneous fistula
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lymphoblastic lymphoma
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basal cell carcinoma
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orbital cellulitis
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