article_snippet.sent: Known by its medical name, a brain teratoma, the growth is very rare.
article_snippet.sent: In the past, teratomas have been reported to contain hair, teeth, bone and rarely more complex organs including eyes, hands, feet and limbs.
article_snippet.sent: A teratoma is a tumour with tissue or organ components from more than one different part of the body.
article_snippet.sent: In some cases a teratoma has been found to resemble a foetus.
article_snippet.sent: They are usually benign masses, though some cancerous forms of teratoma are known to exist.
article_snippet.sent: Mature teratomas, which are typically benign, are more commonly found in women.
article_snippet.sent: Immature teratoma, which are typically cancerous, are more often found in men.
article_snippet.sent: Immature teratoma, which are typically cancerous are thought to be present at birth, but are often not discovered until later in life.
article_snippet.sent: Teratomas can occur in the testes in men and ovaries in women, as well as the brain, skull, nose, tongue, under the tongue and in the neck.
article_snippet.sent: The majority are germ cell tumours.
highlights_snippet.sent: Teratomas are often found in ovaries, testes but more rarely in the brain .