Sternoclavicular joint arthritis as the initial presentation of sarcoidosis

Lumbar facet arthritis after coronavirus disease 2019 vaccination—Utilization of ultrasound

“…In the present case, arthrocentesis was repeated as the amount of aspirated synovial fluid was very small, which may have resulted in false-negative results. Additionally, a synovial biopsy was performed to further differentiate diagnoses such as sarcoidosis and malignant tumors involving the sternoclavicular joint 13,14 ; however, no such findings were observed. Therefore, we diagnosed the patient with reactive arthritis after COVID-19 vaccination.…”