A Gastric Schwannoma Misdiagnosed as B Cell Lymphoma

Abstract

Schwannomas are benign, slow-glowing tumor, and they are very rare. Schwannomas are only 0.2% of all gastric neoplasm, and 4% of benign gastric neoplasm. Schwannomas are histologically composed of mostly spindle cells and peripheral cuff of lymphoid cells aggregations. Peripheral lymphoid cuff of schwannomas is usually focal and thin, but it may rarely have thick band-like lymphoid tissue. Here we report a 53-year-old male, who was initially suspicious of MALT lymphoma in endoscopic biopsy due to thick lymphoid tissue, and diagnosed gastric schwannoma by partial gastrectomy later for the diagnostic confirmation. This case report is written to report a case of misdiagnosis and to tell the reason why repeated biopsy is important.