Neuroendocrine tumors are slow-growing epithelial tumors with predominant neuroendocrine differentiation. Being a rare form of neoplasm they are frequently not considered in the differential diagnosis. Clinical manifestations are often non-specific and may include abdominal pain, bowel obstruction, diarrhoea, weight loss and gastrointestinal bleeding. Here we present a case of a 41-year-old woman with non-specific abdominal pain. During multiple hospital presentations she was misdiagnosed with infectious pelvic inflammatory disease and treated ineffectively with antibiotics when the underlying condition of her persistent abdominal pain was a mid-gut neuroendocrine tumor that had caused bowel perforation and formation of an abscess in the pouch of Douglas.