An 8-year-old girl is brought by her parents for psychiatric evaluation after her teacher expressed concern about poor reading performance. Her IQ testing shows an overall score of 105 (average range). Despite adequate instruction and no school absences, her reading accuracy and comprehension scores fall at the 5th percentile on standardized achievement testing. She does not have attention difficulties, behavioral problems, or anxiety. Vision and hearing screening are normal. Her parents report that her father struggled with reading throughout school.