Brachial Plexus Injury: This condition is highly likely given the symptoms of end root disruptions in the C6-C7 T1 area, which directly correlates with the brachial plexus anatomy. Scapula winging, often associated with weakness of the serratus anterior muscle, can be a manifestation of brachial plexus injury affecting the long thoracic nerve.

Cervical Radiculopathy: Involvement of the C6, C7, and T1 nerve roots can lead to symptoms such as pain, numbness, and weakness in the arm, as well as scapula winging if the nerves supplying the muscles around the scapula are affected.
Thoracic Outlet Syndrome: This condition involves compression of the nerves and/or blood vessels that pass into the thoracic outlet (the space between your collarbone and first rib). It can cause pain in your shoulders and neck and numbness in your fingers, and sometimes scapula winging due to muscle imbalance.

Spinal Cord Injury: Although less likely, any significant trauma or condition affecting the C6-C7 T1 area could potentially involve the spinal cord, leading to more severe neurological deficits. Missing this diagnosis could have devastating consequences.
Tumor or Cyst Compressing Nerves: Tumors or cysts in the cervical or thoracic region can compress nerves, leading to symptoms similar to those described. These conditions require prompt diagnosis and treatment to prevent permanent damage.

Neurodegenerative Diseases (e.g., Amyotrophic Lateral Sclerosis): These diseases can cause progressive muscle weakness and atrophy, potentially leading to scapula winging among other symptoms. However, they are less likely to present with such localized symptoms as end root disruptions in the C6-C7 T1 area.
Infectious or Inflammatory Conditions (e.g., Abscess, Discitis): Infections or inflammatory conditions affecting the spine can cause localized pain and neurological symptoms. While rare, these conditions are important to consider due to their potential for serious complications if not treated promptly.