What is the primary feature of cystitis?

The primary feature of cystitis is inflammation of the bladder, which is accurately reflected in the correct answer. Cystitis often results from infection, irritation, or other underlying conditions leading to symptoms such as urgency, frequency of urination, and pain in the lower abdomen.

This inflammation can be acute or chronic, but the defining characteristic is the involvement of the bladder tissue itself. Understanding cystitis in this context is crucial for recognizing its clinical manifestations and for guiding appropriate treatment options, such as the use of antibiotics for bacterial infections.

The other options describe conditions or features unrelated to cystitis; for example, chronic inflammation of the ureters pertains to ureteritis, and downward brain displacement relates to neurological conditions rather than urinary tract conditions. Presence of targetoid bodies typically refers to specific findings in skin or tissue histology, not relevant to cystitis. Thus, the clear association of inflammation specifically with the bladder establishes the correctness of the answer.