Ipsilateral Hypertrophy of the Mastoid Process in Surgical Cases of Congenital Muscular Torticollis

Abstract

Objective: This study was to investigate ipsilateral hypertrophy of the mastoid process in the patients with congenital muscular torticollis (CMT). Design: Retrospective cross-sectional study. Patients: Children with CMT. Methods: A total of 212 surgical cases of patients with CMT (age: 50.9 ± 44.3 months) and 212 age- and gender-matched controls (age: 50.4 ± 44.2 months) were included. The mastoid process volume was calculated and compared for both groups on the computed tomography axial images. A linear regression analysis was performed between the age and the intrasubject volume difference in the mastoid process. Results: The volume of the mastoid process in the CMT side was significantly larger than that of the non-CMT side in the CMT group (32.2 ± 30.3 cm3 vs 21.9 ± 22.8 cm3; P < .001). In the control group, there was no significant difference between the volume of the right and left mastoid process (21.6 ± 24.6 cm3 vs 21.2 ± 23.8 cm3; P = .472). The intrasubject volume difference in the mastoid process in the CMT group showed a linear increase with the age (adjusted R 2 = 0.286; P < .001), and the volumetric asymmetry of the mastoid process became more severe over age compared to the control group. Conclusion: We showed ipsilateral hypertrophy of the mastoid process in patients with CMT and demonstrated that the volumetric asymmetry increased with age.

Bilateral Mastoid Process Hypertrophy Associated With Severe Trismus

“…A previous case–control study 6 demonstrates that congenital muscular torticollis results in ipsilateral mastoid process hypertrophy with approximately 10 cm 3 difference between both the case control group and within the study group when comparing one side to the other. Chronic strain from the sternocleidomastoid muscle exerts tension on the mastoid process resulting in bone hypertrophy as it adapts to stress.…”

An osteopathic approach to occipital neuralgia and tinnitus

“…26 Moreover, the structure and function of the SCM and mastoid process of the temporal bone are interconnected. 27 Because the SCM attaches at the mastoid process of the temporal bone, a tight SCM can mechanically pull the mastoid process, influencing temporal bone rotation and ultimately leading to tinnitus.…”

The usefulness, reliability, and quality of YouTube video clips on congenital muscular torticollis: A STROBE compliant study

“…[1][2][3] It is characterized by tightness and/or thickening of the ipsilateral sternocleidomastoid muscle, thereby limiting the motion of the neck. [4][5][6][7] Most patients with CMT have a favorable prognosis after physical therapy, which includes stretching. [4,8] Due to the COVID-19 pandemic, face-to-face treatment was often limited, leading people to seek medical information on the Internet.…”

“…[1–3] It is characterized by tightness and/or thickening of the ipsilateral sternocleidomastoid muscle, thereby limiting the motion of the neck. [4–7] Most patients with CMT have a favorable prognosis after physical therapy, which includes stretching. [4,8]…”