Intraabdominal Schwannomas: A Single Institution Experience

Abstract

Intraabdominal schwannomas are rare tumors, which are most frequently located within the GIT. GIT schwannomas are difficult if not impossible to diagnose preoperatively as endoscopic and radiologic findings are nonspecific. The treatment of choice is complete surgical excision because of diagnostic uncertainty, and the long-term outcome is excellent as these lesions are uniformly benign.

Plexiform schwannoma of the duodenum accompanying pyloric stenosis: Report of a case

“…They are frequently surrounded by a cuff of lymphoid aggregates, highly cellular, and composed mainly of bipolar spindle cells. Verocay bodies, vascular hyalinization, Antoni A and B areas, and a typical palisading structure are typically absent, unlike in conventional schwannomas (4,8). On the other hand, the lesser sac schwannoma demonstrates the typical pathologic features of peripheral and soft tissue.…”

“…Because of its rarity, it is not diagnosed preoperatively. The most common presenting symptom is an episode of intermittent GIT blee- ding, abdominal pain, epigastric discomfort and bloatedness, epigastric mass, and rarely, obstruction (4,7). In this patient, the pylorus was covered with normal mucosal epithelium without ulceration but obstruction may have been the result of the secondary effect of the 5 mm PS.…”

“…Because of the obstructive symptoms and the unrecognized etiology, we performed surgery with a clear margin with an uneventful postoperative course. The outcome after surgical resection is excellent, and no report in the literature has shown malignant potential (4,5,8,11). …”

“…Intraabdominal schwannomas occur most frequently in the alimentary tract, and the most common site is the stomach. Other intra-abdominal sites are even rarer and have been reported in the esophagus, small intestine, colon, greater omentum, lesser sac, and the biliary tree (4). Sporadic cases of PS usually present as solitary tumors.…”

Schwannoma in Ascending Colon: A Rare Cause of Abdominal Pain

“…They commonly originate in the stomach [3]- [5] and rarely present in large bowel. In large bowel, the commonest location being the caecum and rectosigmoid colon [6] but rare in ascending colon [7]- [9].…”