Which statement best describes common sources of brain abscess?

• A. Brain abscesses commonly arise from chronic ear infections, sinusitis, dental abscesses, lung infections, and endocarditis
• B. Primary brain tumors
• C. Autoimmune disease only
• D. Epidural hematoma

Answer: (D)

Brain abscesses usually arise from infections spreading into the brain either from nearby structures or through the bloodstream. Contiguous spread from adjacent sites like the middle ear, mastoid, sinuses, or a dental infection is a common pathway, and hematogenous spread from distant septic foci such as lung infections or endocarditis also frequently contributes. The statement listing chronic ear infections, sinusitis, dental abscesses, lung infections, and endocarditis captures these typical sources, which is why it best describes where brain abscesses come from. In contrast, a primary brain tumor, an autoimmune condition by itself, or an epidural hematoma do not represent sources of an infectious brain abscess.