J Korean Soc Radiol.  2011 Oct;65(4):395-398. 10.3348/jksr.2011.65.4.395.

Intranodal Schwannoma Mimicking a Gastrointestinal Stromal Tumor of the Stomach: A Case Report

• Nam KB
• Namkung S
• Kim HC
• Kim HS
• Ryu BY
• Choi YH

• KMID: 2002941
• DOI: http://doi.org/10.3348/jksr.2011.65.4.395

Abstract

A 66-year-old-woman is presented with intranodal schwannoma of the retroperitoneum. Ultrasonography (US) and computed tomography (CT) results demonstrated a large encapsulated mass with internal cystic or necrotic portions in the gastrosplenic space. The tumor abutted the greater curvature of the gastric body and slightly indented the proximal small bowel loops on a small bowel series. The observations suggested a gastrointestinal stromal tumor. The mass was surgically proven to be a retroperitoneal tumor and histopathologically intranodal ancient schwannoma.

MeSH Terms

Gastrointestinal Stromal Tumors
Lymph Nodes
Neurilemmoma

Figure

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  Fig. 1 Intranodal schwannoma of the retroperitoneum in a 66-year-old woman. A, B. Contrast-enhanced (A) axial and (B) coronal CT images demonstrate a well encapsulated large mass with internal cystic portions (short arrows) and wall calcifications (long arrows) in the gastrosplenic region abutting the greater curvature of the gastric body. The left adrenal gland is clearly visualized (white arrow). C. A small bowel series shows a large soft tissue mass shadow abutting the greater curvature of the gastric body (thin arrows) and indenting the proximal small bowel loops (thick arrows). D. Longitudinal ultrasonogram shows a large mass (arrows) with internal cystic changes (asterisk) in the left upper abdomen. E. Low power photomicrograph demonstrates three layers composed of outer fibrous capsule (asterisk), middle thin lymphoid tissue of the lymph node, and the lowest layer of the spindle cell neoplastic lesion (arrow) (Hematoxylin-Eosin; × 40). F. High power photomicrograph demonstrates the positive immunoreactivity of S-100 protein in spindle cells (Immunohistochemical staining; × 100).

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