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We report a rare case of seronegative autoimmune pancreatitis (AIP) that presented as a pancreatic focal lesion and was considered to be pancreatic cancer based on the clinical presentation and imaging findings. The endoscopic ultrasound-guided biopsies of the pancreatic mass revealed no malignant cells and the pancreatic swelling had become diffuse on repeat imaging. AIP was suspected and a trial of steroids was considered as a diagnostic and therapeutic method. The patient responded dramatically to corticosteroid treatment with resolution of symptoms and normal imagining and laboratory parameters. This case highlights the challenge in the diagnostic approach of a pancreatic mass.
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INTRODUCTION: Carcinomas of the thyroid gland represent 3% of all malignancies, with 1.3 to 9.8% corresponding to anaplastic thyroid carcinomas (ATC). Metastases are present in 50% of patients when ATC is diagnosed. Gastrointestinal metastases are a rare finding in patients with thyroid carcinoma. CASE REPORT: A 68-year old gentleman with a history of papillary thyroid carcinoma (PTC) underwent surgery and radiopharmaceutical therapy. Restaging studies nine months later suggested wall thickening localizing to the distal stomach. Endoscopy results showed a large, infiltrative, subepithelial, and ulcerated gastric mass and biopsies revealed anaplastic thyroid carcinoma Conclusion. Incidental thickening or other findings in the stomach in a patient with ATC without gastrointestinal symptoms should be further investigated with endoscopy and biopsies to rule out gastric metastases from anaplastic thyroid carcinoma.