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Stella M. Bulengo-Ransby, MD; Carole Johnson, MD; John S. Metcalf, MD

Arch Dermatol. 1995;131(6):724.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

REPORT OF A CASE

A 63-year-old man presented with a large nodule on his scalp. He reported the lesion to be present for 30 years; the lesion developed as an asymptomatic papule in a site of trauma. The lesion had slowly enlarged and recently ulcerated.

On physical examination, a 5.5x5.0-cm ulcerated tumor draining purulent exudate was seen on the vertex of the scalp (Figure 1). There were hyperkeratotic columns and scale-crust on the surface of the tumor. No cervical or occipital lymphadenopathy was noted.

An incisional biopsy and subsequent excision of the tumor with graft placement was performed (Figure 2 through Figure 4).

What is your diagnosis?

DIAGNOSIS:

Proliferating trichilemmal cyst (PTC).

HISTOPATHOLOGIC FINDINGS

Compact hyperkeratosis and areas of scale-crust were seen. An intradermal tumor composed of lobulated, well-circumscribed squamous epithelium was seen extending to the subcutaneous fat. The lobules had a basaloid . . . [Full Text PDF of this Article]

Author Affiliations
Medical University of South Carolina, Charleston

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