**Question:** Normal nasofrontal angle is:

A. 100 degrees
B. 90 degrees
C. 120 degrees
D. 135 degrees

**Correct Answer:** **B. 90 degrees**

**Core Concept:** The nasofrontal angle is a measure of the angle formed by the intersection of the frontal bone and the nasal bone. A normal nasofrontal angle is important for understanding nasal bone fractures, which are common injuries in facial trauma.

**Why the Correct Answer is Right:** The correct answer, 90 degrees, represents the angle formed by the intersection of the frontal bone and the nasal bone. This is the normal anatomy, and any deviation from this value indicates a pathological condition, such as a fracture. In a fracture scenario, the angle can increase (underlying frontal bone fracture) or decrease (underlying nasal bone fracture).

**Why Each Wrong Option is Incorrect:**

A. 100 degrees: This is too large, indicating a fracture involving both the frontal and nasal bones or a fracture with angulation.

C. 120 degrees: This is too large, similar to option A, and may indicate a fracture involving both the frontal and nasal bones or a fracture with angulation.

D. 135 degrees: This is too large, similar to options A and C, and may indicate a fracture involving both the frontal and nasal bones or a fracture with angulation.

**Why the correct answer is right:** A normal nasofrontal angle of 90 degrees reflects the intact nasal and frontal bones without fracture or angulation. Any deviation from this value suggests a fracture or angulation, which is crucial in facial trauma diagnosis and management planning.

**Clinical Pearl:** Understanding the normal nasofrontal angle is essential for accurate diagnosis of nasal and frontal bone fractures. A thorough clinical examination, including measurements of the nasofrontal angle, is crucial in determining the presence of a fracture and guiding surgical or conservative management decisions.