case_images: PMC8203077_01
case_images: A (arrow) - Axial computed tomography images showing right hilar nodal complex.. B - collapse consolidation of basal segment of the right upper lobe.. C - and right-sided pleural effusion.. D (arrow) - Histology of resected lung showing storiform fibrosis and IgG4-positive plasma cells
case_images: AJTCCM-27-1-130-fig1.jpg
case_images: PMC8203077_01_AJTCCM-27-1-130-fig1.jpg
case_images: F1
case_images: Hospital with a non-productive cough, pleural effusion and abnormal chest X-ray. He was a smoker with a 25-pack a year smoking history and a presumptive diagnosis of stage IV lung carcinoma was considered based on computed tomography (CT) findings (Fig. 1A - C).  Immunohistochemical staining for IgG4 demonstrated >50 IgG4-positive cells per high-power field, meeting the criteria for histology that was highly suggestive of IgG4-RD (Fig. 1D). 