Final answer:
The 2 most common causes of clustered microcysts are infectious processes like neurocysticercosis and inflammatory responses to infections such as meningitis and encephalitis.
Step-by-step explanation:
The 2 most common causes of clustered microcysts, which may develop in any organ and are more often found in subcutaneous tissue, the brain, and the eyes, are typically due to infectious processes or the body's reactions to foreign substances. For instance, in the brain, a condition such as neurocysticercosis, which can be observed on CT scans with numerous cysts, is caused by a parasitic infection (tapeworm). Another common cause of cyst formation can be an inflammatory response to an infection, exemplified by conditions like meningitis and encephalitis, which may also be responsible for clustered cysts if there is an inflammatory response triggered in the central nervous system (CNS).