[A Case of Gastric Anisakiasis That Required Differentiation from Scirrhous Gastric Cancer].

A 36-year-old woman visited a previous doctor with lower abdominal pain and nausea. Her former doctor's upper gastrointestinal endoscopy and CT scan showed giant folds and wall thickening of the lower body of the stomach, and she was referred on suspicion of scirrhous gastric cancer. Similar findings were found on enhanced CT at our hospital. Endoscopic findings performed several days later showed red and thickened mucosa at the cardia, but no wall thickening and giant fold, and there were no findings suggestive of scirrhous gastric cancer. Biopsy showed no atypical cells, and a large number of eosinophils appeared in the lesion at the cardia. Eosinophilia and anisakis IgE antibody were positive and a diagnosis of gastric anisakiasis was made. She was eating grilled horse mackerel the day before her stomachache. At the same time, pruritus and edema around her right knee also appeared, and a dermatologist diagnosed her with anisakis-related eosinophil edema. One month later, CT scan and endoscopy were almost normal. A young woman referred on suspicion of scirrhous gastric cancer experienced a rare case diagnosed with gastric anisakiasis.