[A case report of cervicomediastinal lipoma].

We experienced a case of cervicomediastinal lipoma. The patient was a 3-year-old boy suffering from low-grade fever and dry cough. We detected an abnormal shadow on a chest X-ray film. Subsequent CT and MRI demonstrated a nonhomogeneous mass extending from the posterior mediastinum to the right side of the neck. We performed an operation for the mediastinal tumor under median sternotomy and right neck incision. The encapsulated tumor was 11 x 6 x 8 cm in size and was histologically diagnosed as myxolipoma. The nonhomogeneity of the tumor was due to myxomatous degeneration of the adipose tissue. Although this case was complicated by Horner's syndrome, the postoperative course was relatively fair.