What is the minimum anteroposterior diameter of a skull indicated by brachycephaly?

Brachycephaly is a condition characterized by a short and broad skull shape, where the anteroposterior diameter is significantly less than the transverse diameter. This leads to a wider skull that appears to be shorter from front to back.

The condition typically results from abnormal growth patterns or genetics and can indicate certain developmental conditions. The broad anteroposterior diameter does not represent a normal or narrow skull but rather emphasizes the broader dimensions that define brachycephaly.

In contrast, a narrow skull would not fit the criteria for brachycephaly, as this condition specifically refers to an increased width relative to the length. Thus, broad is the appropriate indication of the anteroposterior diameter associated with this skull shape.