SCHWANNOMA DE COLON ASCENDENTE: UNA CAUSA INESPERADA DE HEMORRAGIA DIGESTIVA BAJA

Schwannomas of the gastrointestinal tract are spindle cell tumors originating from peripheral nerve lining Schwann cells, accounting for 2–6% of all mesenchymal tumor and are benign in 98% of cases. Most commonly, they are asymptomatic and discovered incidentallyin elderly. The preoperative diagnosis is challenging because clinical manifestations and CT findings are nonspecific, and biopsies during colonoscopy are in most cases non conclusive, as in our patient, who presented atypical abdominal pain and hematochezia. The best therapeutic option is a complete surgical resection, which will give the definitive diagnosis by confirming S-100 proteins on the immunohistochemical analysis.