Fetal hydantoin syndrome
- Dilantin Embryopathy
- Phenytoin Embryopathy
Children with this condition may be small at birth, with increased hair on the body and face, and with poorly developed fingernails and toenails. They may also have poor muscle tone. Facial features that may be present with this syndrome include a flat bridge of the nose; an underdeveloped vertical groove in the center of the upper lip (philtrum); a large mouth; and malformed ears. Features specific to the eyes may include down-slanted eyes; widely spaced eyes (hypertelorism); crossed eyes (strabismus); drooping eyelids (ptosis); and/or epicanthal folds (skin folds of the eyelid covering the inner corner of the eye). Other features that have been reported include a short or webbed neck and low-set hair line. Growth deficiencies may include underdeveloped fingers and/or toes, malformed nails, as well as finger-like thumbs.
These features are often associated with growth delay and varying degrees of developmental delay. The risk for an affected child to be neurologically impaired is estimated at 1 to 11 % (two to three times higher than for the general population). The risk of cleft lip and/or palate and heart defects is estimated to be about five times higher among exposed infants. Some case reports have suggested an increased risk for the occurrence of benign (noncancerous) or malignant (cancerous) tumors, such as neuroblastoma or other neonatal tumors (ependymoma, ectodermal tumors, Wilms tumor).
The Human Phenotype Ontology provides the following list of signs and symptoms for Fetal hydantoin syndrome. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up the definitions for these medical terms.
The Human Phenotype Ontology (HPO) has collected information on how often a sign or symptom occurs in a condition. Much of this information comes from Orphanet, a European rare disease database. The frequency of a sign or symptom is usually listed as a rough estimate of the percentage of patients who have that feature.
The frequency may also be listed as a fraction. The first number of the fraction is how many people had the symptom, and the second number is the total number of people who were examined in one study. For example, a frequency of 25/25 means that in a study of 25 people all patients were found to have that symptom. Because these frequencies are based on a specific study, the fractions may be different if another group of patients are examined.
Sometimes, no information on frequency is available. In these cases, the sign or symptom may be rare or common.
- Aaron B Caughey. Seizure Disorders in Pregnancy. eMedicine. June 28, 2011; http://emedicine.medscape.com/article/272050-overview#aw2aab6b3. Accessed 8/10/2011.
- Fetal Hydantoin Syndrome. NORD. April 25, 2008; http://www.rarediseases.org/rare-disease-information/rare-diseases/byID/948/viewAbstract. Accessed 8/9/2011.
- E. Robert-Gnansia. Fetal hydantoin syndrome. Orphanet. February 2006; http://www.orpha.net/consor/cgi-bin/OC_Exp.php?lng=EN&Expert=1912. Accessed 8/10/2011.