case_images: PMC8578520_01
case_images: Ultrasonography showing diffuse enlargement and hyperechoic findings in the right sternocleidomastoid muscle (A). A congenital vertebral anomaly was suspected in the clavicle X-ray imaging (yellow arrow) (B).
case_images: fped-09-709616-g0001.jpg
case_images: PMC8578520_01_fped-09-709616-g0001.jpg
case_images: F1
case_images: Diffuse enlargement and hyperechoic findings on the right SCM were confirmed, which was compatible with the diagnosis of SCM mass type of CMT (Figure 1A). A clavicle X-ray imaging was conducted to identify an associated fracture due to birth trauma on the same day and a suspected congenital vertebral anomaly was coincidentally found (Figure 1B).
case_images: Three-dimensional volume-rendered computed tomography. Coronal image (A) and 3-dimensional image (B) showing T1 butterfly vertebra. Axial cervical image showing enlargement of the sternocleidomastoid muscle (arrow) at the C7 level (C) and a hemivertebra (arrow) at the T1 level (D).
case_images: fped-09-709616-g0002.jpg
case_images: PMC8578520_01_fped-09-709616-g0002.jpg
case_images: F2
case_images: T1 hemivertebra caused the right tilt (Figures 2A-D). The patient was ultimately diagnosed with the concurrent manifestation of CMT and congenital osseous torticollis at 1-month-old age.
case_images: PMC8578520_02
case_images: Ultrasonography of the right (yellow arrow) and left sternocleidomastoid muscles (arrowhead), revealing a fibromatosis colli in the right sternocleidomastoid, suggesting right CMT at the age of 3 months (A). A follow-up test at the age of 7 months showed the decreased size and improved echogenicity in the right sternocleidomastoid (B).
case_images: fped-09-709616-g0003.jpg
case_images: PMC8578520_02_fped-09-709616-g0003.jpg
case_images: F3
case_images: An ultrasound examination showed a fibromatosis colli and heterogeneous echogenicity in the right SCM, suggesting SCM mass type of CMT (Figure 3A). During follow-up, an ultrasound showed that the right SCM lesion had decreased in size and normalized echogenicity (Figure 3B).
case_images: Hypoplasia of the left superior oblique muscle and an absence of the left fourth cranial nerve. Coronal T2-weighted orbital image showing that the left superior oblique muscle (red arrow) is smaller than the right (yellow arrow), suggesting hypoplasia (A). A high-resolution image shows that the right fourth cranial nerve (arrow) is well-identified; however, the left fourth cranial nerve is not visible (B).
case_images: fped-09-709616-g0004.jpg
case_images: PMC8578520_02_fped-09-709616-g0004.jpg
case_images: F4
case_images: The examination revealed left hypertropia causing the right tilt, and the MRI revealed a small left superior oblique muscle and absence of the left fourth cranial nerve in the cistern (Figures 4A,B).