M60.022

Clinical Causes: Bacterial infections, such as Staphylococcus aureus or Streptococcus species, entering the muscle tissue through a wound or skin infection. Viral infections, including influenza or herpes viruses, leading to widespread muscle inflammation. Fungal infections, in rare cases, that spread to muscle tissue, especially in immunocompromised individuals. Parasitic infections, such as trichinellosis, acquired through contaminated food or water. Contiguous spread from nearby infections like skin or joint infections. Direct trauma or injury that introduces infectious agents into the muscle tissue.

Key Symptoms: Pain in the left upper arm that may worsen with movement or touch. Swelling and tenderness over the affected muscle. Muscle weakness, making it difficult to lift or move the arm normally. Fever and general feelings of illness or fatigue. Redness or warmth over the affected area due to inflammation. Limited range of motion caused by pain and swelling.

Diagnosis Path: Diagnosis typically involves a combination of clinical evaluation and laboratory tests. A healthcare provider may perform a physical examination to assess pain, swelling, and muscle strength. Blood tests can reveal signs of infection, such as elevated white blood cell count and markers of inflammation like C-reactive protein (CRP) or erythrocyte sedimentation rate (ESR). Imaging studies, such as MRI or ultrasound, can help visualize the inflamed muscle tissue. In some cases, a muscle biopsy may be necessary to identify the infectious organism and confirm the diagnosis.

Treatment Protocols: Treatment of infective myositis involves addressing both the infection and the inflammation. Antibiotics are commonly prescribed if a bacterial infection is identified. Antiviral medications may be used for viral causes. Supportive therapies include rest, pain management with over-the-counter or prescribed pain relievers, and physical therapy to restore muscle function once the infection subsides. In severe cases, hospitalization may be necessary for IV antibiotics or surgical intervention to drain abscesses or remove damaged tissue. Prompt diagnosis and treatment are essential to prevent complications like muscle necrosis or spreading infection.