ALT--MAN ?

748.All are true regarding sacrococcygeal teratomas except

a.most probably derived from cells of Hensen's node

b.calcification  found in about 50% of benign teratomas

c.typically lie cephalic to the intergluteal cleft

d.Altman type I tumors  have minimal presacral component

e.mostly  mixed solid and cystic lesions

748.---c

Sacrococcygeal teratomas is the most common newborn tumor, the most common tumor of the sacrococcygeal region in childhood, and the most common sacrococcygeal germ cell tumor.

Most sacrococcygeal teratomas are visible externally (80% to 90%) Sacrococcygeal teratomas account for 25% of skin-covered lumbosacral masses  and typically lie within or below the intergluteal cleft .

 spinal lipomas nearly always lie cephalic to the upper end of the intergluteal cleft.

Grossly, sacrococcygeal teratomas are classified by their relationship to the skin surface and the pelvis .

Altman type I tumors (47%) lie predominantly external to the normal body and have minimal presacral component.

Altman type II tumors (35%) are evident externally but have significant intrapelvic extension. Altman type III tumors (9%) can be detected externally but lie predominantly within the pelvis and abdomen. Altman type IV tumors (10%) are entirely presacral.