de Almeida Júnior H L, Rivitti E A, Jaeger R G
Department of Dermatology, University of São Paulo, Brazil.
Mycoses. 1990 Sep-Oct;33(9-10):491-7.
White piedra or trichosporosis is a superficial mycosis of the hair shaft, caused by the yeast Trichosporon beigelii; it has been found in all continents and may involve the hair of any part of the body. We report a case of white piedra on the hairs of the inguinal fold with ultrastructural studies. Transmission electron microscopy showed that the nodules have the same morphological aspects as the fungus in culture (hyphae and arthrospores) except for the presence of a cementant substance. By scanning electron microscopy the elimination of spores was seen on the nodule surface. Interestingly similar nodules were found on cotton fibres of the patient's underwear, which were also studied by scanning electron microscopy. This finding can explain therapeutic failure and demands special hygienic conditions related to clothes.
白癣菌病或毛结节菌病是一种由白吉利丝孢酵母引起的毛发浅表真菌病；在各大洲均有发现，可累及身体任何部位的毛发。我们报告一例腹股沟皱襞毛发白癣菌病的超微结构研究病例。透射电子显微镜显示，结节具有与培养中的真菌相同的形态特征（菌丝和关节孢子），只是存在一种胶结物质。通过扫描电子显微镜观察到结节表面有孢子脱落。有趣的是，在患者内衣的棉纤维上也发现了类似的结节，也对其进行了扫描电子显微镜研究。这一发现可以解释治疗失败的原因，并要求在衣物方面具备特殊的卫生条件。
