To date, Castleman's lymphoma has been known to occur as a benign tumor of the medistinum, However, we recently encountered a case of Castleman's lymphoma occurring in the neck of a 42-year-old female patient.
Dynamic CT showed a high density, which decreased rapidly. From the facts that the enhancement image was uniformly dense and the high density did not last long, the tumor would not be a malignant tumor nor hemangioma. Our diagnosis was a hypervascular solid mass.
The tumor was excised from the patient's neck. The surface of the tumor was rich in blood vessels and was readily bleeding. Histologically, a diagnosis of giant lymphoid hamartoma (Castleman's lymphoma) was made. The postoperative course was good, and no relapse has occurred to date. One characteristic of this case was marked proliferation of the blood vessels. This result indicates that dynamic CT is highly useful for the differential diagnosis of neck tumors.
