Case 179. Protothecosis (66 y-o M)

　 　 　 　
　 Biopsy from an irregular infiltrative nodule on the dorsum of the hand of a farmer who cultivates Japanese oranges 　
　 　 　 　

　

 　 The sporangia containing endospores are positively stained with PAS sequence. Protothecal sporangia are much smaller than those of Coccidioides immitis.