SD: conceived the study, interpretation of data, and writing the manuscript.MR, TL, RTG, DS: Data collection and interpretation of results. All authors read and approved the final manuscript.

Plasmablastic lymphoma (PBL) is a rare and aggressive variant of diffuse large B-cell lymphoma which is associated with HIV infection. Recently, it has also been reported in immunocompetent and solid organ transplant patients. PBL commonly presents in extranodal regions such as oral cavity, digestive tract, and skin. Orbital involvement by PBL is extremely rare with only few reports in the literature. We present a case of PBL involving the bilateral orbits in an immunocompetent patient with 1-year follow-up on 18F-FDG PET/CT scan.

Graft versus host disease (GVHD) is the most frequent and serious complication of allogenic hematopoietic stem cell transplant. Polymyositis is a rare neuromuscular manifestation of GVHD, which often responds well to corticosteroid and immunosuppression therapy. We present a case of a 38-year-old man with a known case of mixed-phenotype acute leukemia after hematopoietic stem cell transplant presenting with GVHD-associated polymyositis. 18F-FDG PET/CT done in this case not only helped in the detection of the muscle involvement but also helped in obtaining precise muscle sample for histopathological diagnosis using PET-guided biopsy.

Esophago-pulmonary fistulas are very less reported in literature. 18F-FDG PET/CT scan is routinely used for evaluation of patients of carcinoma esophagus. We present a case of carcinoma esophagus with acquired esophago-pulmonary fistula diagnosed on 18F-FDG PET/CT scan.

Extrathyroidal manifestations of autoimmune thyroid disorders include thyroid-associated ophthalmopathy, thyroid dermopathy, and thyroid acropachy. Thyroid acropachy is an extreme manifestation of autoimmune thyroid disorder characterized by clubbing and swelling of fingers and toes, with or without periosteal reaction of the distal bones. We present a 50-year-old woman, posttreatment for carcinoma breast (6 years back) and referred for bone scan for generalized body ache. Bone scan findings resulting in detailed clinical evaluation prompted toward the suspicion of a thyroidal disease with ultimate diagnosis of Graves' disease.