This diagnostic image consists of two panels showing a three-dimensional (3D) CT reconstruction of the human cervical region and skull base in posterior and oblique views. The primary finding is a significantly elongated and thickened left styloid process (indicated by yellow arrowheads) that exhibits complete bony fusion with the hyoid bone. This ossified stylohyoid complex measures approximately 70 mm in length and maintains a uniform thickness of roughly 10 mm. The surrounding anatomical structures, including the cervical vertebrae (C1-C7), mandible, and upper thoracic cage (clavicles and ribs), appear normally aligned. The right styloid process is visible but significantly shorter and disconnected from the hyoid. This presentation is characteristic of a severe anatomical variant of Eagle Syndrome, demonstrating the progressive ossification of the stylohyoid ligament and its impact on the anatomical relationship between the temporal bone and the hyoid apparatus, which can lead to symptoms like dysphagia and orofacial pain.

This lateral neck radiograph features a diagnostic overlay illustrating Eagle syndrome or stylohyoid ligament ossification. A red outline traces the pathological ossification of the stylohyoid chain, extending from the skull base to the hyoid bone. Key anatomical landmarks are labeled with yellow arrows: the Tympanohyal region (superiorly near the temporal bone), the Stylohyal (the proximal portion of the styloid process), the elongated and ossified Stylohyoid ligament, and its distal attachment at the Hyoid Bone. The image demonstrates the relationship of this ossified structure to adjacent anatomy, including the posterior border of the mandible and the cervical spine. The visual focus is the continuous, elongated bony projection that can cause clinical symptoms such as dysphagia or facial pain. This material is suitable for dental, ENT, and radiology students studying craniofacial anatomy and calcification disorders of the head and neck.

A lateral neck X-ray (radiography) demonstrating extensive ossification of the stylohyoid complex. The image features color-coded outlines and arrows highlighting key anatomical structures: a red arrow and outline identify the styloid process of the temporal bone; a green arrow and outline delineate the continuous, elongated radiopaque ossification of the stylohyoid ligament; and a blue arrow and outline mark the hyoid bone. The ossification forms a near-continuous bony chain extending from the skull base to the lesser cornua of the hyoid bone, showing non-uniform thickness and density along its length. This radiographic finding is characteristic of Eagle syndrome or asymptomatic stylohyoid ligament mineralization. Other visible landmarks include the cervical vertebrae (C1-C7) and the mandible. This diagnostic image is intended for educational use in oral and maxillofacial radiology or otolaryngology to illustrate pathological mineralization of soft tissues in the neck.

**Modality:** Lateral projection plain radiograph (X-ray). **Anatomic Region:** Upper cervical spine and skull base, including the craniovertebral junction and oropharyngeal soft tissue area. **Observations:** The image demonstrates a prominent, elongated, and heavily ossified structure originating from the styloid process at the skull base. This radiopaque structure extends anteroinferiorly and caudally toward the level of the hyoid bone. The ossification appears continuous and robust, occupying the lateral cervical space. The cervical vertebrae (C1-C5 visible) show preserved alignment and disc heights, though there is superimposed radiopacity from the ossified ligament over the upper cervical segments. **Pathology/Clinical Entity:** The findings are highly characteristic of **Eagle syndrome** (stylohyoid syndrome), specifically demonstrating complete or near-complete **ossification of the stylohyoid ligament**. **Key Diagnostic Features:** - Significant elongation and mineralization of the styloid process. - Continuous radiopaque band extending to the hyoid bone. - Differentiation from vascular calcification based on the linear, anatomical trajectory of the stylohyoid apparatus.