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November 1981

Squamous Cell Carcinoma Arising in an Epidermal Cyst

Arch Dermatol. 1981;117(11):683. doi:10.1001/archderm.1981.01650110005004

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To the Editor.—  Squamous cell carcinoma arising in an epidermal cyst, although not rare, is unusual in occurrence. I had the opportunity of treating a patient with a well-differentiated carcinoma in a long-standing sebaceous cyst. There was a 25-year period of follow-up evaluation during which the patient had had no recurrence of the lesion.

Report of a Case.—  A 34-year-old man, admitted to the hospital on Feb 21, 1955, had had a mass on the left posterior side of his head for 20 years. Considerable enlargement of the tumor had occurred during the two years before admission.Physical examination disclosed a lesion 8 cm in diameter and 3 cm high (above the level of the scalp). Fluctuation and a fluid wave were easily demonstrable. Palpation suggested that the outer table of the skull under the mass was eroded.Roentgenograms defined scattered areas of calcification in the mass. A moderate degree

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