[Subcutaneous emphysema as the initial manifestation of perforation of a hollow abdominal viscus].

The authors reports a case of cervical and abdominal subcutaneous emphysema, associated to pneumoretroperitoneum and pneumomediastinum, with no free air in the abdominal cavity, secondary to perforated diverticulitis of the sigmoid colon. We comment the rarity of this clinical presentation, the physiopathologic mechanisms of subcutaneous air presence in cases of non instrumental perforation of abdominal viscera and the ominous significance of the subcutaneous emphysema in such perforations.