Which radiological features are associated with achondroplasia?

Achondroplasia is a genetic disorder characterized primarily by dwarfism, which is evident in the radiological features associated with the condition. The correct answer highlights the combination of a large skull and a narrow foramen magnum, both of which are key characteristics of achondroplasia.

In individuals with achondroplasia, the skull often appears larger than average due to the abnormal growth of the head associated with this condition. The foramen magnum, which is the opening in the skull through which the spinal cord passes, is typically narrower in patients with achondroplasia. This narrowing can lead to potential complications, such as compression of the spinal cord, which may be associated with neurological issues.

The other options present characteristics that do not accurately describe the typical radiological findings in achondroplasia. Though some features related to limb development or density of bones may seem relevant, they do not specifically capture the hallmark elements of achondroplasia as effectively as the large skull and narrow foramen magnum do. Thus, the combination of these two features is essential for recognizing achondroplasia in radiological assessments.