Introduction
The incidence of testicular germ cell tumors has increased from 5.7 to
6.8 cases per 100,000 individuals between 1992 and 2009 [1].
Testicular yolk sac tumors are rare in nature. They are a type of
non-seminomatous germ cell tumors. In adults, yolk sac tissue in germ
cell tumors is usually seen in combination with other types of germ cell
tumors. They usually present during the second and third decades of
life. Distant disease is also more frequent in post pubertal patients
than the pediatric patients [2]. These yolk sac tumors are dangerous
and without treatment, lead to rapid deterioration of clinical status.
Wang et al. [3] reported in 2015 that during their literature
search, they only found < 20 cases of pure yolk sac tumors in
adults. On further literature search, we found 2 more case reports
published after 2015 reporting a case of pure yolk sac tumor [4]
[5]. We report here a case of gonadal primary adult yolk sac tumor
in a 40-year-old male.