A del(13)(q21.32q31.2)dn refined to 21.9 Mb in a female toddler with irides heterochromia and hypopigmentation: appraisal of interstitial mid-13q deletions

A Rare Co-occurrence of Intestinal Malrotation and Hirschsprung's Disease in a Neonate with 13q21.31q33.1 Interstitial Deletion Including the EDNRB Gene

We report a rare co-occurrence of intestinal malrotation and Hirschsprung's disease (HSCR) in a male neonate with a large 38.8 Mb interstitial deletion of chromosome 13 extending from q21.31 to q33.1 including the EDNRB gene, who presented with craniofacial dysmorphic features and central nervous system malformations. The loss of EDNRB gene in addition to bilateral hearing loss and HSCR suggested an additional diagnosis of Waardenburg-Shah's syndrome. This case highlights the fact that prior knowledge of this rare association in infants with 13q deletion syndrome would enable early diagnosis and prompt interventions to prevent gastrointestinal complications.

Iris Hypoplasia as the Presenting Sign of Retinoblastoma in a Child With a 13q Deletion

Germline partial chromosomal deletions of the entire RB1 gene (13q deletions), account for 6% of the RB1 mutational spectrum. The authors report the rare case of one patient with suspected bilateral iris heterochromia who actually had iris hypoplasia (often masquerading as heterochromia) and bilateral retinoblastoma, due to 13q deletion syndrome. [J Pediatr Ophthalmol. 2018;55:e10-e13.].