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Arch Dermatol. 2005;141:1161-1166.

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

Diagnosis: Eosinophilic granuloma.

MICROSCOPIC FINDINGS AND CLINICAL COURSE

The skin biopsy specimen demonstrated an ulcer surrounded by a dense cellular infiltrate composed of eosinophils, lymphocytes, and histiocytes with abundant eosinophilic cytoplasm, vesicular nuclear chromatin, and nuclear grooves. The histiocytes were positive for S100 protein. On electron microscopy, a population of histiocytes with Birbeck granules (Langerhans histiocytes) was identified.

Clinically, various topical agents, including antibiotic ointments and creams and bland emollients, were applied to the ulcers. However, the patient felt even more pronounced pain and preferred observation only. He was followed up for 6 months, with no change in his skin condition.

DISCUSSION

The diverse possible causes, along with often overlapping morphological features, which may be associated with a variety of infectious and noninfectious conditions, make the diagnosis of perianal ulceration challenging. The most common causes, such as herpes simplex virus, cytomegalovirus, tuberculosis, and syphilis, are infection related, particularly in immunocompromised patients. In rare instances, histoplasmosis and leishmaniasis can present . . . [Full Text of this Article]

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Arch Dermatol. 2005;141(9):1161-1166.
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