Case 156. Staphylococcal botryomycosis (16 y-o M)
Excisional biopsy of a subcutaneous nodule of the hip
Key words : Staphylococcus aureus, botryomycosis, grain
Along the fistula tract, irregular clustering of basophilic cocci (grain) is observed (HE, lower power).   In the grain, cocci are surrounded by eosinophilic amorphous matrix (Splendore-Hoeppli material) (HE, high power).
The cocci in the grain are Gram-positive (Gram). The diagnosis should be staphylococcal botryomycosis.