title: Letter: Rectus-muscle spasm simulating perforated peptic ulcer.
mesh_terms: D000009:Abdominal Muscles; D000328:Adult; D003937:Diagnosis, Differential; D003975:Diazepam / Q000627:therapeutic use; D006801:Humans; D008297:Male; D009020:Morphine / Q000009:adverse effects; D009120:Muscle Cramp / Q000139:chemically induced / Q000175:diagnosis* / Q000188:drug therapy; D010439:Peptic Ulcer Perforation / Q000175:diagnosis*
chemical_list: D009020:Morphine; D003975:Diazepam