Small granules are present in the discharge from a mycetoma. These consist of clusters of organisms. The color of the grains may suggest the causative species.
Black:
(1) Madurella mycetomatis
(2) Madurella grisea
(3) Leptosphaeria senegalensis
(4) Pyrenochaeta romeroi
Yellow ("sulfur granules"):
(1) Petriellidium (Allescheria) boydii (PAS positive)
(2) Acremonium (Cephalosporium) facliforme (PAS positive)
(3) Acremonium (Cephalosporium) kilense (PAS positive)
(4) Acremonium (Cephalosporium) recifei (PAS positive)
(5) Phialophora jeanselmi
(6) Zopfia rosati
(7) Fusarium solani
(8) Corynespora cassiicola
(9) Nocardia brasiliensis (acid fast)
(10) Nocardia asteroids (acid fast)
(11) Streptomyces somaliensis
(12) Actinomadura (Streptomyces) madurae (grains may be > 2 mm)
White:
(1) Petriellidium (Allescheria) boydii (PAS positive)
(2) Acremonium (Cephalosporium) facliforme (PAS positive)
(3) Acremonium (Cephalosporium) kilense (PAS positive)
(4) Acremonium (Cephalosporium) recifei (PAS positive)
(5) Phialophora jeanselmi
(6) Zopfia rosati
(7) Fusarium solani
(8) Corynespora cassiicola
(9) Nocardia brasiliensis (acid fast)
(10) Nocardia asteroids (acid fast)
Red:
(1) Actinomadura (Streptomyces) pelletieri
Specialty: Infectious Diseases
ICD-10: ,