Kramer Sasha C, Ryan Michael, Bourbeau Paul, Tyler William B, Elston Dirk M
Department of Dermatology, Geisinger Medical Center, Danville, Pennsylvania 17822, USA.
Pediatr Dermatol. 2006 Sep-Oct;23(5):473-5. doi: 10.1111/j.1525-1470.2006.00286.x.
We describe mycetoma caused by Microsporum canis occurring in a 9-year-old African-American girl. Pathologic evaluation showed a granulomatous dermatitis with numerous large fungal grains containing septate hyphae that were Fontana-Masson positive. Two cultures of pure grains grew M. canis. Mycetoma due to dermatophytes is very uncommon. The few instances reported have been pseudomycetoma (grains in the absence of sinus tracts). Our patient developed sinus tracts (true mycetoma). No prior reports were found of M. canis staining Fontana positive. Differentiation of dermatophyte-induced mycetoma from kerion is important because mycetomas require a combined approach including surgical debridement in addition to oral antifungal therapy.
我们描述了一名9岁非裔美国女孩发生的由犬小孢子菌引起的足菌肿。病理评估显示为肉芽肿性皮炎，有大量含分隔菌丝的大真菌颗粒，Fontana-Masson染色呈阳性。两次纯颗粒培养均生长出犬小孢子菌。皮肤癣菌引起的足菌肿非常罕见。已报道的少数病例为假足菌肿（无窦道的颗粒）。我们的患者出现了窦道（真性足菌肿）。未发现犬小孢子菌Fontana染色阳性的既往报道。区分皮肤癣菌引起的足菌肿和脓癣很重要，因为足菌肿除口服抗真菌治疗外还需要联合手术清创的方法。
