Whitehead Matthew,  Lee Bonmyong

Final Pr. ID: Poster #: EDU-012

The posterior fossa houses the brainstem and cerebellum. These vital and complex parenchymal structures contain many important white matter tracts, nuclei, and neurons responsible for both basic fundamental and higher-level functions. A number of disease processes can interfere with rhombencephalic development, including genetic malformations and disruption such as hypoxia, toxins, infections, trauma, and vascular disorders. Structural changes associated with fetal imaging pathology that deviate from the normal gestational-age specific developmental patterns can define the etiology, improve our understanding of the disease, and help with prognostication. A comprehension of basic embryology and developmental anatomy is necessary to achieve a true understanding of posterior fossa anomalies and normal variants. In this exhibit, we aim to illustrate common and rare anomalies of the brainstem, cerebellum, meninges, and meningeal spaces visible on fetal MRI, presented in a temporal manner based on the embryologic development of the posterior fossa. Read More

Authors:  Whitehead Matthew , Lee Bonmyong

Keywords:  Posterior fossa, cerebellum, brainstem

Sinha Richa,  Tang Vivian,  Stivaros Stavros,  Hawkes Rob,  Dixon Rachel,  Ferreira Dos Santos Rui Miguel,  Maniyar Amit,  Wright Neville

Final Pr. ID: Poster #: EDU-100

Significant advances in the pre- and postnatal neuroimaging techniques in correlation with neurogenetics have led to more accurate diagnosis and classification of posterior fossa abnormalities. The poster aims to highlight important aspects of normal anatomy of the posterior fossa, illustrate cases of the cystic abnormalities in the posterior fossa, and how to differentiate between them based on neuroimaging findings. Read More

Authors:  Sinha Richa , Tang Vivian , Stivaros Stavros , Hawkes Rob , Dixon Rachel , Ferreira Dos Santos Rui Miguel , Maniyar Amit , Wright Neville

Keywords:  Posterior fossa

Matos Rojas Irma,  Lazarte Claudia,  Alpaca Rodriguez Larry

Final Pr. ID: Poster #: CR-04 (R)

Three cases of dermoid cyst will be described with different clinical presentation and location. MRI and CT finding will be reviewed and correlated with pathological finding.
The first case is a 7 year- old child, with suspected diagnosis of stroke which MRI shows a midline posterior fossa tumor with fine occipital dermal sinus, better visualized in CT. The second case is 1 year- old enfant with delayed psychomotor development, a dimple with lock of hair and dorsal hemangioma, which MRI shows a dermal sinus at D4 – D5 level which continues with an intra and extramedullary mass. The last case is 2 year- old child postoperated of mielomeningocele at birth that has neurogenic blader and Chiari II with a cyst mass at conus and low spinal cord insertion. Read More

Authors:  Matos Rojas Irma , Lazarte Claudia , Alpaca Rodriguez Larry

Keywords:  Dermoid cyst, Magnetic resonance imaging, Posterior fossa, spinal

Mchendrie Mariska,  Tshuma Makabongwe

Final Pr. ID: Poster #: CR-005

Birth related brain and spinal cord injury is uncommon. The pediatric cervical spine has ligamentous laxity, poor muscular development and a cartilaginous predominant vertebral column. This in combination with a large head relative to body size predisposes them to craniocervical junction injuries, especially during instrumented delivery using forceps or vacuum extraction. These injuries cause significant parental and physician distress as it can result in permanent neurological deficit or even death in a previously well fetus.

Clinical suspicion for brain or spinal cord injury should be raised when there is diminished spontaneous movement, apnea, no deep tendon reflexes or no response to painful stimuli. There can be co-existing hypoxic ischemic encephalopathy that can mask the clinical signs of cord injury or intracranial hemorrhage and result in diagnostic delay. It can also worsen the neurologic prognosis if not appropriately managed.

Magnetic resonance imaging findings of cranio-cervical junction injuries and associated extra-axial or cerebral parenchymal hemorrhage has been reported. We present a case series of four patients presenting typically with forceps assisted birth related cervical spine trauma and unexpected associated posterior fossa findings. Read More

Authors:  Mchendrie Mariska , Tshuma Makabongwe

Keywords:  Trauma, Birth related, Spine and posterior fossa

Goncalves Luís,  Jain Shilpa,  Krishnan Ananth,  Yuxiang Zhou,  Bloom David,  Lee Wesley,  Romero Roberto

Final Pr. ID: Poster #: SCI-079

To develop reference ranges for cerebellum and posterior fossa measurements by fetal MRI and to investigate the reproducibility and diagnostic performance of quantitative MR parameters for the differentiation of fetal posterior fossa abnormalities. Read More

Authors:  Goncalves Luís , Jain Shilpa , Krishnan Ananth , Yuxiang Zhou , Bloom David , Lee Wesley , Romero Roberto

Keywords:  posterior fossa, cerebellar vermis, Blake's pouch cyst, fetal MRI, Dandy-Walker malformation

Gebarski Kathleen,  Gebarski Stephen

Final Pr. ID: Poster #: EDU-065

Sonography of the posterior fossa in infants can be challenging and difficult to interpret. Use of posterior fontanelle, mastoid and squamous temporal bone acoustic windows has improved the visualization of the posterior fossa in infants. We provide a 10 year experience of posterior fossa sonography to improve familiarity with a wide variety of diseases of the posterior fossa. Read More

Authors:  Gebarski Kathleen , Gebarski Stephen

Keywords:  posterior fossa, sonography, infants