Compression of which part of the brain can result in anisocoria?

Anisocoria, which refers to unequal pupil sizes, can occur as a result of compression of the brainstem, specifically affecting structures involved in the pupillary light reflex. The correct answer focuses on the temporal lobe because it is adjacent to critical pathways that control parasympathetic innervation to the eye, particularly impacting the oculomotor nerve.

Although all the brain regions mentioned play significant roles in various functions, the temporal lobe's proximity to the midbrain where these pathways converge makes it particularly relevant in the context of anisocoria. Compression in this area, such as from hematomas, tumors, or increased intracranial pressure, can disrupt the normal functioning of the oculomotor nerve and lead to anisocoria by affecting the muscles that control pupil constriction.

In cases where the other lobes (frontal, parietal, and occipital) are directly compressed, they do not have the same immediate effect on the pupillary control mechanisms as the temporal lobe, thereby making it less likely for them to be a direct cause of anisocoria.