Admit
Untreated,<unk>  leads to the same pathologic changes as any mechanical large bowel obstruction: increasing bowel dilation and distension, dehydration, edema and eventual ischemia and necrosis of the bowel wall, bacterial translocation and sepsis, and eventual bowel wall perforation.
Cecal perforation is rare: 1-3%
Ogilvie's syndrome
Malignancy 
Dressler's syndrome
Diverticular disease
Fitz-Hugh-Curtis syndrome
Compression from metastatic disease
Mallory-Weiss tear
Impaction