Pediatric gastric teratoma.

Neoplasms from germ cell origin are a heterogeneous group of tumors rarely seen in the pediatric population, teratoma is the most frequent among them. They can occur in either gonadal or extragonadal locations. Extragonadal teratoma arising from abdominal viscera is very unusual.

[Nephrogenic adenoma of the urinary bladder. A lesion that can be confused with carcinoma. Report of 4 cases].

Nephrogenic Adenoma (NA) was first illustrated in 1949 by Davis, who described a case he interpreted as a "hamartoma". One year later Friedman and Kuhlenbeck described eight further examples in detail and named this lesion nephrogenic adenoma. This process is generally accepted to be metaplastic.