**Question:** Occipital lobe tumours may produce

A. visual impairment
B. memory loss
C. seizures
D. altered consciousness

**Core Concept:**
The occipital lobe is a region in the posterior part of the cerebral cortex, primarily responsible for processing visual information received from the eyes. Occipital lobe tumours can disrupt the normal functioning of this area, leading to various neurological symptoms.

**Why the Correct Answer is Right:**
Occipital lobe tumours, if present, can exert mass effect on the surrounding brain tissue, leading to compression and subsequent dysfunction. This disruption can manifest as visual impairment (Option C), which is a direct consequence of the tumour interfering with visual processing in the occipital lobe.

**Why Each Wrong Option is Incorrect:**
A. Memory loss (Option B) and altered consciousness (Option D) are unrelated to occipital lobe tumours. Memory is controlled by the hippocampus and related structures, while consciousness is influenced by the prefrontal cortex and related areas. Seizures (Option C) can occur with occipital lobe tumours due to the aforementioned mass effect, but the other options are not specific consequences of occipital lobe dysfunction.

**Clinical Pearl:**
Visual impairment is a common but not universal symptom of occipital lobe tumours. In a clinical setting, a thorough neurological examination should be performed to identify other potential signs and symptoms, such as visual field defects, dysmetria of gaze, and visual hallucinations.

**Correct Answer:** C. seizures

Occipital lobe tumours, especially those located in the visual cortex, can disrupt the functional integrity of the area, leading to seizures. The mass effect caused by the tumour can cause neuronal dysfunction and excitability, leading to the generation of abnormal electrical discharges that manifest as seizures.