Which of the following is a red flag in congenital muscular torticollis (CMT)?

Poor visual tracking is a red flag in congenital muscular torticollis (CMT) because it may indicate associated neurological or developmental issues that require further evaluation. In children diagnosed with CMT, tracking and visual motor skills can be compromised, which can suggest a need for interdisciplinary approaches to treatment. Early identification of these issues is crucial for effective intervention and management.

In contrast, normal visual tracking would suggest that the child's visual and neurological development is likely on track, which is typically not a concern in cases of CMT. Normal muscle tone would also not raise flags, as children with CMT commonly have muscle tightness rather than generalized hypotonia. Lastly, the presence of no additional abnormal findings indicates a more straightforward case of CMT without complications, leading to a less urgent need for additional assessment or intervention.