PMC8578520_01
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).
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F1
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).
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).
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F2
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.
PMC8578520_02
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).
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F3
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).
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).
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F4
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).