Leah Croll, MD, Assistant Professor of Clinical Neurology at the Lewis Katz School of Medicine at Temple University, offered insight to ABC’s “Good Morning America” about the recovery of Hayley Erbert, who is the wife of Derek Hough. Erbert underwent a craniectomy for a cranial hematoma, which is when blood collects in the skull, and will soon have a skull implant placed. Dr. Croll is not involved in Erbert’s treatment.