Material from a fungus-ball infection produced colonies with a green surface on Sabouraud agar. Which Aspergillus spp. is most probably identified?

The identification of the fungus-ball infection producing colonies with a green surface on Sabouraud agar most likely points to Aspergillus flavus. This species is characterized by its green conidial heads and is known for forming a distinctive green color when cultured. A. flavus is commonly associated with opportunistic infections, particularly in immunocompromised individuals, and its identification is crucial for proper diagnosis and treatment.

Aspergillus niger, on the other hand, typically forms dark black to brown colonies rather than green. Aspergillus fumigatus generally presents as a grayish or blue-green coloration but does not show the distinct green surface associated with A. flavus. Aspergillus terreus can also have a different coloration profile and does not typically exhibit the same green colony characteristics found with A. flavus.

In summary, the green surface colonies on Sabouraud agar strongly indicate Aspergillus flavus, making it the most probable identification in this scenario.