De novo interstitial deletion of 15q22q23 with global developmental delay and hypotonia: the first Korean case / 소아과

Interstitial deletions involving the chromosome band 15q22q24 are very rare and only nine cases have been previously reported. Here, we report on a 12-day-old patient with a de novo 15q22q23 interstitial deletion. He was born by elective cesarean section with a birth weight of 3,120 g at 41.3-week gestation. He presented with hypotonia, sensory and neural hearing loss, dysmorphism with frontal bossing, flat nasal bridge, microretrognathia with normal palate and uvula, thin upper lip in an inverted V-shape, a midline sacral dimple, severe calcanovalgus at admission, and severe global developmental delay at 18 months of age. Fluorescence in situ hybridization findings confirmed that the deleted regions contained at least 15q22. The chromosome analysis revealed a karyotype of 46,XY,del(15) (q22q23). Parental chromosome analysis was performed and results were normal. After reviewing the limited literature on interstitial 15q deletions, we believe that the presented case is the first description of mapping of an interstitial deletion involving the chromosome 15q22q23 segment in Korea. This report adds to the knowledge of the clinical phenotype associated with the 15q22q23 deletion.

A Case of 4q Deletion with Partial Agenesis of Corpus Callosum

Syndrome of 4q deletion is characterized by an abnormal shape of the skull, craniofacial dysmorphism, cardiovascular malformations, genitourinary defects, limb and digital anomalies, and developmental delay. We experienced a case of 4q interstitial deletion in a 2 day-old female neonate who showed short extremities, partial agenesis of corpus callosum and congenital heart defects. We report the case with a brief review of the literature.

A Case of de novo Interstitial Deletion of 17 Chromosome

This is the first reported case of a unique interstitial deletion involving the long arm of chromosome 17 in a Korean male infant born to parents with normal karyotype. The patient presented with multiple congenital malformations suggestive of chromosomal anomaly including round face, upslanted palpebral fissure, hypertelorism, posteriorly rotated low set ear, micrognathia, microcephaly, finger- like thumb, bilateral hearing loss, cryptorchidism, and severe developmental delay found upon outpatient follow-ups. A table of comparison is shown in between our case with previously reported 3 cases by Park, et al.(1992), Dallapiccola, et al.(1993), and Khalifa, et al.(1993).