[Encapsulated hematoma of the sigmoid mesocolon. Apropos of an unusual case in Niger]. / Hématome enkysté du mésocôlon sigmoïde. A propos d'une observation exceptionnelle au Niger.

After reporting the case of a patient with an asymptomatic encapsulated hematoma of the sigmoid mesocolon, the main causes of hematomas of the GI tract will be reviewed. Hematomas of the mesocolon are rare. The morphology of an hematoma is related to its location and its US appearance can vary considerably over time. To our knowledge only nine cases of hematoma of the sigmoid mesocolon have been reported. The unusual nature of this case lies in the encapsulated nature of the hematoma, its unusual morphology and the lack of apparent underlying etiology, all elements that lead us to the conclusion that this hematoma was idiopathic and spontaneous.