IgG4-Related Disease (IgG4-RD) Presenting as a Mass in the Carotid Triangle Masquerading Paraganglioma.

IgG4-related disease (IgG4-RD) which is a protein disorder presented as a mass in the right carotid triangle in a 30 year male patient, who underwent battery of tests is described. The radiologist opined the mass as paraganglioma and the spindle shaped character of the mass also suggested neurogenic tumor in differential diagnosis. Reference to vascular surgeon also opined the same, and adviced for incisional biopsy. Histopathology report suggested IgG4-RD and immunochemistry confirmed the final diagnosis. The neck mass which we opined as a single organ disease, proved to be multiorgan disease in PET scan.