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Alexander K. C. Leung, MBBS; C. Pion Kao, MD
From the Department of Pediatrics, University of Calgary and Alberta Children's Hospital, Calgary.

Arch Pediatr Adolesc Med. 2000;154:309-310.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

A FEMALE INFANT was born to a gravida 3, para 1, 25-year-old woman at 36 weeks' gestation. The infant was delivered by cesarean section. A huge mass was attached to the infant's lower back (Figure 1).

Figure 1.

Denouement and Discussion: Sacrococcygeal Teratoma

Figure 1. A huge sacrococcygeal teratoma is attached to the infant's lower back. The cephalic portion of the tumor is necrotic.

Sacrococcygeal teratomas, although rare, are the most frequently recognized neoplasm in fetuses,¹ with an incidence of approximately 1 in 35,000 to 40,000 live births.¹ More common in female than male infants (4:1²), a familial predisposition is present in some cases.³ The incidence of twins in the immediate family varies from 14% to 50%.

Teratomas are congenital tumors composed of tissues derived from all 3 embryonic germinal layers. Postsacral tumors are thought to arise from multipotential embryonic cells that . . . [Full Text of this Article]