Acevedo Silvia,  Ritze Kimberly

Final Pr. ID: Poster #: CR-001 (T)

To provide MRI staff education on MRI fetal exams for sacrococcygeal teratomas. Sacrococcygeal teratoma (SCT) is a congenital germ cell tumor located at the base of the tailbone in newborns. This birth defect is generally not malignant. A SCT is most often diagnosed prenatally using routine obstetric ultrasonography, and further anatomical evaluation may require MRI. A SCT can grow during pregnancy and develop large blood vessels requiring more work for the fetal heart. SCT are more common in females than in males and occur in about 1 in 35,000 live births. Read More

Authors:  Acevedo Silvia , Ritze Kimberly

Keywords:  MRI, sacrococcygeal, teratomas

Aslan Mine,  Arioz Habibi Hatice,  Kalyoncu Ucar Ayse,  Namdar Yesim,  Adaletli Ibrahim,  Kurugoglu Sebuh

Final Pr. ID: Poster #: CR-026

Sacrococcygeal teratoma (SCT) is one of the most common tumors of the newborn. SCT is seen frequently in the presacral region and in forms of solid or mixed solid and cystic masses. Only 10-15 % of all sacrococcygeal teratomas are in pure cystic form. Here, in this case, we aimed to present sonographic and magnetic resonance images (MRI) of a newborn with pelvic cystic mass and bilateral hydronephrosis that were seen on prenatal ultrasonography.
An operation was planned for two days of age girl patient for cystic pelvic mass and bilateral hydronephrosis detected by prenatal sonography during the third trimester. On her abdominal X-ray radiography, there was no bowel gas at the midline pelvis. The patient was referred to the sonography unit with the suspicion of a duplication cyst. Abdominal sonography revealed bilateral hydroureteronephrosis, bladder wall thickening, and a 75x55x32 mm pure cystic mass located between the rectum and bladder. The mass had a fine septa at the inferior site. Abdominal MRI showed that the mass had no connection with the spinal canal or solid component. The patient was operated and the diagnosis of purely cystic sacrococcygeal teratoma was confirmed histopathologically.
Anterior meningocele, tail gut cyst, rectal duplication cyst, and cystic sacrococcygeal teratomas are common lesions of the presacral region diagnosed in the prenatal or antenatal period. Sacrococcygeal teratoma should be kept in mind in patients with presacral cystic mass in the neoatal period and radiologic methods are helpful for displaying the extent and content of a cystic mass. Read More

Authors:  Aslan Mine , Arioz Habibi Hatice , Kalyoncu Ucar Ayse , Namdar Yesim , Adaletli Ibrahim , Kurugoglu Sebuh

Keywords:  Sacrococcygeal teratoma, Sonography, Magnetic resonance imaging, Neonatal

Belachew Bethelhem,  Silva De Campos Meneses Marcus Otavio,  Moreira Vidal Lorenna

Final Pr. ID: Poster #: EDU-090

Abstract:
Sacral development is a key determinant of bowel and bladder function in children with anorectal malformations (ARM) and sacral agenesis. Accurate radiologic assessment of the sacrum provides essential prognostic information, guiding both surgical planning and long-term management. We aim to review the imaging-based metrics used to evaluate sacral development, highlighting their significance in predicting continence outcomes.
ARM result from abnormal development of the hindgut and cloacal membrane between weeks 6 and 9 of gestation. These malformations can vary significantly, ranging from minor anal displacement to complex defects that involve the rectum, vagina, and urethra. Both the anorectal structures and the sacrum develop from the caudal mesoderm during the same period, which means that sacral anomalies, such as hypoplasia or agenesis, often occur alongside ARM. Due to this close embryologic origin, the sacrum can provide important insights into the prognosis of ARM, and specific metrics can offer objective information for assessment.
The sacral ratio (SR), derived from anteroposterior (AP) and lateral pelvic radiographs, is the most widely used quantitative measure. It stratifies patients into prognostic categories, with SR ≥ 0.7 indicating good continence potential and SR < 0.4 associated with poor outcomes. However, SR is subject to variability due to patient positioning, pelvic tilt, and image quality.
Additional metrics such as the sacral index (SI) and sacral curvature (SC) offer complementary insights. SI reflects sacral width and height and has been correlated with ARM severity. SC provides a qualitative measure of sacral shape and is associated with continence outcomes. These measurements are often limited by the constraints of conventional radiography and the technical challenges of MRI, including non-isotropic data and restricted field of view.
This educational exhibit will provide a comprehensive review of sacral measurements in ARM and sacral agenesis. We encourage a standardized and multimodal approach to sacral assessment, and provide information for a deeper understanding of:
- Sacral and anorectal malformations embryology
- Key radiologic metrics (SR, SI, SC) and their interpretation
- Limitations and considerations in measurement techniques
- The prognostic significance of sacral development Read More

Authors:  Belachew Bethelhem , Silva De Campos Meneses Marcus Otavio , Moreira Vidal Lorenna

Keywords:  Anorectal Malformation, Sacrococcygeal, Xray