Gastric anisakiasis presenting as a vanishing tumor

Dai, Zhehao; Kobayashi, Daiki

doi:10.1002/jgf2.248

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Reports of vanishing colonic tumors include cytomegalovirus infection, angioedema resulting from acquired type II C1-inhibitor deficiency, and colorectal cancer [9][10][11]. Vanishing tumor due to anisakiasis has been reported in the stomach and can most likely also occur in the colon [12]. Spontaneous regression of various tumors such as neuroendocrine tumors has also been reported, particularly after biopsy [13].…”

Section: Discussionmentioning

confidence: 99%

Multiple non-polypoid mucosal Schwann cell hamartomas presenting as edematous and submucosal tumor-like lesions: a case report

2021

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Background Mucosal Schwann cell hamartomas are rare neurogenic tumors which present most commonly in the distal colon. They are usually discovered as small, single polyps in asymptomatic patients. Case presentation An asymptomatic 64-year-old man was referred to us after a 12 mm subepithelial lesion was discovered incidentally on screening colonoscopy. Follow-up colonoscopy conducted 2 months later revealed that the tumor had disappeared, leaving multiple edematous, submucosal tumor-like elevations presenting as skip lesions throughout the sigmoid colon. Lesions had elongated pits on magnifying endoscopy and were limited to the first layer on endoscopic ultrasound. Biopsies revealed unclearly delineated foci of spindle-shaped cells limited to the lamina propria. On immunohistochemistry, all lesions were positive for S-100 protein and negative for CD34, CD56, and neurofilament protein. The patient was diagnosed with multiple mucosal Schwann cell hamartomas of the sigmoid colon. He remains asymptomatic after 18 months of follow-up, but the lesions have also remained unchanged. Conclusion We report a case of multiple non-polypoid mucosal Schwann cell hamartomas. Endoscopic findings may assist in the differential diagnosis, particularly when presenting as non-polypoid, submucosal tumor-like lesions.

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Section: Discussionmentioning

confidence: 99%

Multiple non-polypoid mucosal Schwann cell hamartomas presenting as edematous and submucosal tumor-like lesions: a case report

2021

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Gastric Eosinophilic Granuloma Related to Anisakiasis Resected by Laparoscopic and Endoscopic Cooperative Surgery

Namikawa¹,

Marui²,

Yokota³

et al. 2021

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Background: Anisakiasis-related gastric eosinophilic granuloma is rare. Case Report: Herein, we report a patient with anisakiasis-related gastric eosinophilic granuloma who was treated with laparoscopic and endoscopic cooperative surgery (LECS). A 59-year-old woman was presented to our hospital for further examination of a gastric lesion that was initially diagnosed by a local medical doctor. Esophagogastroduodenoscopy showed a submucosal tumor-like lesion in the lower body of the stomach. Endoscopic ultrasonography showed a heterogeneous hypoechoic submucosal mass lesion in the submucosal layer measuring 10 mm, without evidence of deep involvement. Under a clinical diagnosis of gastrointestinal stromal tumor, the patient underwent LECS. Gross appearance of the resected specimen revealed a 1.5×1.0 cm submucosal tumor-like lesion. Microscopic examination revealed necrosed insects consistent with the characteristics of gastric anisakiasis, around which prominent eosinophilic infiltration and granulomas were observed. This prompted a diagnosis of gastric eosinophilic granuloma related to anisakiasis. Conclusion: To the best of our knowledge, this is the second case of gastric eosinophilic granuloma related to anisakiasis resected by LECS in the English medical literature. LECS might be a useful procedure for minimally invasive therapeutic diagnosis.

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Gastric anisakiasis presenting as a vanishing tumor

Abstract: Gastric anisakiasis might present as a submucosal tumor‐like lesion in esophagogastroduodenoscopy. Cautious search is needed when it is suspected in order to avoid misdiagnosis and unnecessary invasive procedures.

Cited by 2 publications

References 7 publications

Multiple non-polypoid mucosal Schwann cell hamartomas presenting as edematous and submucosal tumor-like lesions: a case report

Multiple non-polypoid mucosal Schwann cell hamartomas presenting as edematous and submucosal tumor-like lesions: a case report

Gastric Eosinophilic Granuloma Related to Anisakiasis Resected by Laparoscopic and Endoscopic Cooperative Surgery

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