TY - JOUR T1 - IgG4-related lung disease as a differential diagnosis of a lymphoproliferative disease: atypical presentation of an atypical disease JF - BMJ Case Reports JO - BMJ Case Reports DO - 10.1136/bcr-2021-247295 VL - 15 IS - 1 SP - e247295 AU - Camilo Vargas AU - Carolina Velásquez AU - Edgardo Mancilla AU - Joaquín Aracena Y1 - 2022/01/01 UR - http://casereports.bmj.com/content/15/1/e247295.abstract N2 - IgG4-related disease (IgG4-RD) is an immunomodulated inflammatory disease that usually affects the pancreas and parotid glands. Although lung involvement is rare, it has been recently reported and could mimic various other diagnoses. We present a case of IgG4-RD whose symptoms and images raised the suspicion of a malignant lymphoproliferative lung neoplasm. It is imperative to differentiate both diseases, since their treatment and prognosis vary. ER -