52 patients were followed up out of a total of 87 children with sacrococcygeal teratomas, within a period of 25 years, from three paediatric surgery hospitals and out of altogether 73 survivors. The results in 35 children where the operation had been performed more than three years ago, were classified as "late results". From this group, 18 children were followed up by clinical examination only, without detecting any dysfunctions. By the additional use of electromanometry of urinary bladder and rectum, however, bladder and rectum dysfunctions were seen in about 40% of 17 further children. These dysfunctions were partly myogenic and partly neurogenic in nature and were directly related to the size, tumour status and intrapelvic extension of the sacrococcygeal teratoma.