An 18-year-old man with tropical verrucous syndrome: Leishmaniasis or sporotrichosis?

The tropical verrucous syndrome includes infectious, chronic, and granulomatous skin conditions appearing with plaques, nodules, or ulcers with a warty surface which gives name to the syndrome. It includes forms of chromoblastomycosis, sporotrichosis, paracoccidioidomycosis, lobomycosis, leishmaniasis, and tuberculosis verrucosa cutis with ample distribution in tropical and subtropical areas. The diagnoses may be difficult and confused among them, especially between sporotrichosis and leishmaniasis. Clinical, epidemiologic, intradermal reactions, direct smears, skin biopsies, cultures, immunofluorescence, and PCR are used to differentiate them, although several of these methods are not commonly used. We present an 18-year-old man with extensive verrucous plaques in one knee interpreted by clinic, epidemiology, and biopsy as verrucous cutaneous leishmaniasis. He was treated with Glucantime® for 20 days without improvement. A new biopsy was made that was also interpreted as cutaneous leishmaniasis. The revision of both biopsies showed inflammation with abscessed granulomas and asteroid sporotrichotic bodies at the center of the granulomas that led to the diagnosis of sporotrichosis later confirmed by the fungus culture. The patient responded to the treatment with itraconazole. As clinical and epidemiological findings of leishmaniasis and sporotrichosis can be similar, skin biopsy and other paraclinical studies are necessary to establish a proper diagnosis. The asteroid sporotrichotic body is pathognomonic of this mycosis. We review here the essential concepts of leishmaniasis and sporotrichosis and the criteria to differentiate them.