Imaging, including CT head and PET-CT, showed no evidence of malignancy or mass lesions, and multiple myeloma was excluded with normal immunology such as normal immunoglobulin (IgA) ,IgG, Ig M and normal CT, PET scan without any abnormal findings. Angiotensin-converting enzyme (ACE) levels were normal, making sarcoidosis less likely. Respiratory review was unremarkable. Here, ACE is linked to plasma cell myeloma.