Could it be severe left leg pain?

You might have muscle pain coupled with pressure on the neck and the shoulder region. Muscles are likely to be tensed or strained bringing about such signs. The issue of muscle dropping below your clavicle and squeezing your neck could result from sitting or standing with drooping shoulders. You can ease them by keeping the right body posture always, engaging in mild stretches that won’t hurt much, and using warm towels on those affected spots. 

Based on your CT scan, it looks like you have some fractures in your ribs, which could be causing the pain in your back when walking. The hemothorax next to your rib fractures is a collection of blood outside your lungs. This might be making it a bit tough for you to move around comfortably. It's great that you are resting, which is really important for healing those fractures. Make sure to keep monitoring your pain levels and follow up with your doctor for any further guidance. 

Perhaps your backache is associated with nerve injury. I recommend that you see a neurologist for an accurate diagnosis and treatment. They will perform further tests and establish what is causing your pain.

Soft tissue tumors are small growths that can form in muscles, tendons, or other tissues. You might feel a lump under your skin, but why they appear is often unknown. Fortunately, most of these tumors are not cancerous. If removal is needed, doctors typically perform excision surgery, where they cut out the tumor.

There can be several causes of knee cartilage pain and knee joint swelling, such as injury, overuse, or conditions like arthritis. It might also make you feel some stiffness, redness, or warmth in the joint. It is of paramount importance to the rest of the injured joint, ice apply, raise it, and take over-the-counter pain relievers. In seeking medical help if the pain continues or gets worse, you can get the necessary tests and treatments. 

Left-hand discomfort can arise from various sources, such as muscle strain, repetitive motion, or even underlying conditions like arthritis or nerve compression. Symptoms may include aching, stiffness, or numbness. To alleviate this, consider resting the hand, applying ice, and taking over-the-counter pain relief as needed. Additionally, gentle stretching exercises can promote circulation and flexibility. However, if the sensation persists or worsens, seeking advice from a orthopedist is essential. They can offer a thorough assessment and personalized treatment options to ensure your well-being.