Patients with idiopathic granulomatous mastitis accompanied by erythema nodosum.

IGM may be associated with extramammary symptoms such as EN, arthralgia, and episcleritis. These extramammary findings suggest that IGM may be an autoimmune disease. For this reason, breast examination and history of IGM of the breast should be questioned in female patients admitted to different clinics with EN. This way, delays in the diagnosis and treatment of IGM can be prevented.