Malignant Teratoma of Prostatic Gland / 대한비뇨기과학회지

A teratoma is a true tumor which is composed of a variety of cell types representative of more than one germ layer. These neoplasms are principally encountered in the ovaries and testes. Rarely teratoma arises in the midline of the body such as anterior mediastinum, retroperitoneum, sacrococcygeal region, intracranial cavity, neck, and abdominal viscera, presumably from primitive sequestrated cell nests during embryogenesis. The teratoma is mostly benign in histology and biology, however, rarely cancer develops in preexisting benign cystic teratoma. The prostatic gland is an unusual site of the teratoma and so we report a case of teratoma which arose in the prostatic gland and underwent malignant change.

Retroperitoneal Cyst / 대한비뇨기과학회지

The retroperitoneal space is that indefinite area in the lumber and iliac region which lies between the peritoneum and the posterior wall of the abdominal cavity. The term retroperitoneal cyst or tumor is usually confined by the pathologist to these arising from the structures situated in the retroperitoneal space. Retroperitoneal cysts are that of non-neoplastic nature and originated from retroperitoneal tumor Because the retroperitoneal space is rather extensive and adjacent organs are easily displaced, many of the cysts grow to a large size before giving any clinical manifestation. Frequently, when the patient is first seen, there is an indefinite abdominal mass the exact nature of which is obscure, and the diagnosis is not made until the time of surgical investigation.