Case Report Open Access
Copyright ©The Author(s) 2023. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Clin Cases. Jun 6, 2023; 11(16): 3899-3906
Published online Jun 6, 2023. doi: 10.12998/wjcc.v11.i16.3899
Reading impairment after neonatal hypoglycemia with parieto-temporo-occipital injury without cortical blindness: A case report
Naoko Kurahashi, Shunsuke Ogaya, Yuki Maki, Norie Nonobe, Sumire Kumai, Yosuke Hosokawa, Chikako Ogawa, Keitaro Yamada, Koichi Maruyama, Kiyokuni Miura, Department of Pediatric Neurology, Central Hospital, Aichi Developmental Disability Center, Kasugai 480-0392, Aichi, Japan
Yuki Maki, Sumire Kumai, Department of Pediatrics, Nagoya University Graduate School of Medicine, Nagoya 466-8560, Aichi, Japan
Norie Nonobe, Division of Neonatology, Center for Maternal-Neonatal Care Nagoya University Hospital, Nagoya 466-8560, Aichi, Japan
Chikako Ogawa, Department of Pediatrics, Tokyo Metropolitan Fuchu Medical Center for the Disabled, Fuchu 183-0042, Tokyo, Japan
Miho Nakamura, Department of Functioning and Disability, Institute for Developmental Research, Aichi Developmental Disability Center, Kasugai 480-0392, Aichi, Japan
Miho Nakamura, Okazaki Medical Center for Child Development, Okazaki 444-0011, Aichi, Japan
ORCID number: Naoko Kurahashi (0000-0002-5437-2614).
Author contributions: Kurahashi N contributed to the conceptualization, methodology, investigation, writing-original draft of the manuscript; Kurahashi N Ogaya S, Maki Y, and Nonobe N involved in the resources; Ogaya S, Maki Y, Nonobe N, Kumai S, Hosokawa Y, Ogawa C, Yamada K, Maruyama K, Miura K, and Nakamura M participated in the writing-review and editing; and all authors have read and approved the final manuscript.
Supported by the JSPS KAKENHI, JP19K14292.
Informed consent statement: Informed written consent was obtained from the parents of the participant for publication of this report and any accompanying images.
Conflict-of-interest statement: All the authors report no relevant conflicts of interest for this article.
CARE Checklist (2016) statement: The authors have read the CARE Checklist (2016), and the manuscript was prepared and revised according to the CARE Checklist (2016).
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See:
Corresponding author: Naoko Kurahashi, MD, Attending Doctor, Department of Pediatric Neurology, Central Hospital, Aichi Developmental Disability Center, 713-6 Kagiya-cho, Kasugai 480-0392, Aichi, Japan.
Received: March 17, 2023
Peer-review started: March 17, 2023
First decision: April 11, 2023
Revised: April 24, 2023
Accepted: April 27, 2023
Article in press: April 27, 2023
Published online: June 6, 2023


Perinatal brain injury may lead to later neurodevelopmental disorders, whose outcomes may vary due to neuroplasticity in young children. Recent neuroimaging studies have shown that the left parietotemporal area (which includes the left inferior parietal lobe) is associated with phonological awareness and decoding skills, which are essential skills for reading acquisition in children. However, the literature on the effect of perinatal cerebral injury on the development of phonological awareness or decoding ability in childhood is limited.


We report the case of an 8-year-old boy who presented with reading difficulty following a perinatal injury in the parieto-temporal-occipital lobes. The patient was born at term and was treated for hypoglycemia and seizures during the neonatal period. Diffusion-weighted brain magnetic resonance imaging on postnatal day 4 revealed cortical and subcortical hyperintensities in the parieto-temporo-occipital lobe. At the age of 8 years, physical examination was unremarkable, aside from mild clumsiness. Despite occipital lobe injury, the patient had adequate visual acuity, normal eye movement, and no visual field defects. Full-scale intelligence quotient and verbal comprehension index on Wechsler Intelligence Scale for Children-Fourth Edition were 75 and 90, respectively. Further assessment revealed adequate recognition of Japanese Hiragana letters. However, he had significantly slower reading speed in the Hiragana reading test than control children. The phonological awareness test revealed significant errors (standard deviation +2.7) in the mora reversal task.


Patients with perinatal brain injuries in the parietotemporal area require attention and may benefit from additional reading instructions.

Key Words: Brain diseases, Hypoglycemia, Dyslexia, Long-term care, Education, Case report

Core Tip: Limited research on the effect of perinatal cerebral injury on the development of reading ability in childhood is available. Herein, we report the case of an 8-year-old boy presenting with reading difficulty (dyslexia) following perinatal injury in the parieto-temporal-occipital lobes. Despite occipital lobe injury, the patient had adequate visual acuity, normal eye movement, and no visual field defects. His verbal comprehension index on the Wechsler Intelligence Scale for Children-Fourth Edition and ability to adequately recognize Japanese Hiragana letters were adequate. However, he showed remarkably poor reading fluency and phonological awareness. Careful attention should be paid to patients with perinatal brain injury in the parietotemporal region.


Reading is crucial for academic and social success. For reading acquisition, developing phonological awareness and decoding skills in early childhood is vital[1]. Phonological awareness is the ability to recognize, identify, and manipulate syllables and phonemes in language[2]. Decoding is the process of using vowel and consonant combinations to determine word pronunciation[1].

Previous studies using diffusion tensor imaging have demonstrated that microstructural differences in the left parietotemporal region correlate with reading proficiency in the general population[3,4]. In addition, studies using functional magnetic resonance imaging have demonstrated that the left parietotemporal area is essential for decoding each letter to its respective sound, even for Japanese Hiragana letters[5,6]. Currently, literature describing the effect of prenatal injury to the parietotemporal area on reading ability in later life is limited.

Chief complaints

An 8-year-old boy with reading difficulties was referred to our hospital. His mother reported that he struggled with chunking letters when reading, while accurately differentiating between similar Hiragana letters.

History of present illness

The patient was born at term via emergency cesarean section due to pregnancy-induced hypertension, with a birth weight of 2628 g and Apgar scores of 10 (at 1 min and 5 min). His mother had finished junior college and did not have diabetes mellitus. On day 2, he was admitted to the neonatal intensive care unit for poor feeding, apnea, and hypoglycemia (25 mg/dL), and was treated with oxygen and intravenous glucose. On day 3, he experienced neonatal seizures and was administered midazolam for 1 wk. No signs of infection or inborn metabolic errors were observed. Diffusion-weighted imaging on day 4 revealed cortical and subcortical hyperintensities in the bilateral occipital, parietal, and temporal lobes (Figures 1A-C), which diminished on day 12. The patient was discharged after 2 wk.

Figure 1
Figure 1 Diffusion-weighted images on day 4, and T1- and T2-weighted images, and fluid-attenuated inversion images at 8 years of age. A-C: Diffusion-weighted images reveal cortical and subcortical hyperintensities in the bilateral occipital, parietal, and temporal lobes; D and F: T1-weighted image and fluid-attenuated inversion image show mild volume loss in the parieto-temporal region, compared with the frontal region, with minimal cortical changes; E-G: Fluid-attenuated inversion images show a high-intensity area in the white matter of the bilateral parieto-temporo-occipital lobes, which includes the periventricular region at the trigone of the lateral ventricles and centrum semiovale; H: T2-weighted image shows ulegyria in the bilateral parieto-temporal regions.

His developmental milestones were mildly delayed during infancy; he walked, uttered single words, and said two-word sentences at 18, 16, and 27 mo, respectively. His head circumference during youth was within the normal range and his intelligence quotient on the Tanaka-Binet Intelligence Scale at the age of 4 years was 76. He received temporary educational support for simple calculations and clock reading in the first grade, but required no educational support in the second grade, although he received private tutoring after school. His reading problems emerged in the third grade, where he struggled with longer sentences. He had no difficulties solving simple calculations for his age and could solve mathematical problems when the words were read aloud.

History of past illness

No other relevant history was noted.

Personal and family history

No dyslexia or other psychological problems were reported within the family.

Physical examination

Ophthalmological examination showed that his vision was spared (Table 1). Neurological examination showed some soft neurological signs, which were otherwise normal. He had no dysarthria.

Table 1 Patient’s physical examination and psychological test outcomes at age of 8 years.
Physical examination parameters

    BCVA, LogMAR (OD/OS)0.00/0.10
    SER(D), (OD/OS)-2.875/0.375
    Eye movementNormal
    Fundus oculiNormal
    Confrontational visual field testNot defected
Neurologic examinationMildly poor performance in diadochokinesis and finger opposition test
Psychological test parameter
Wechsler Intelligence Scale for Children-IV
    Full scale intelligence quotient75
    Subtest digit span, SD-0.67
Developmental test for visual perception
    Perceptional quotient64
    Subtest I/II/III/IV/V, perceptual age equivalent (year:month)5:03/5:00/4:06/5:08/6:06
Kaufman Assessment Battery for Children II
    Cognitive ability62
    Sequential processing/simultaneous processing/planning/learning68/60/66/69
    Academic achievement84
    Subtest reading/decoding13
    Subtest reading and comprehension6
    Subtest verbal knowledge11
    Subtest expressive vocabulary6
Hiragana reading test
Reading time/error, SD
    Single mora task+5.17/+6.63
    Word task (words)+4.06/+0.86
    Word task (non-words)+2.95/+3.25
    Sentence task+5.52/+2.00
Phonological awareness task (mora reversal task)
Error, SD
    Three-mora word+0.66
    Four-mora word+2.70
Laboratory examinations

Laboratory test values were within normal limits, including those for thyroid function.

Imaging examinations

Magnetic resonance imaging scans obtained at 8 years of age showed mild volume loss in the parieto-temporal region compared with the frontal region, with minimal cortical changes (Figures 1D and F). Fluid-attenuated inversion images obtained at 8 years of age showed a high-intensity area in the white matter of the bilateral parieto-temporo-occipital lobes, which included the periventricular region at the trigone of the lateral ventricles and centrum semiovale (Figures 1E-G). Coronal T2-weighted imaging showed ulegyria in the bilateral parieto-temporal regions (Figure 1H).


To assess his comorbid neurodevelopmental disorders, his mother rated him using the attention-deficit/hyperactivity disorder (ADHD) Rating Scale-IV. His inattention and hyperactivity-impulsivity subscale scores were in the 80th and 50th percentiles, respectively. Additional interviews did not indicate comorbid ADHD or autism spectrum disorder.

The psychological test results are presented in Table 1. His full-scale IQ on the Wechsler Intelligence Scale for Children-Fourth Edition was subnormal, while his verbal comprehension index was normal. The patient showed impaired cerebral visual perception. His ability to recognize Japanese hiragana letters was adequate for his age, as shown in the Reading/Decoding subtest of the Kaufman Assessment Battery for Children-Second Edition (K-ABC II), which analyzes only the accuracy of letter recognition and is unable to detect the disability of the decoding speed (Table 1). We focused on reading speed for the screening of reading disabilities, as Japanese hiragana characters are phonograms whose letter-to-sound correspondence is extremely clear[7]. In such languages, reading speed is more sensitive than reading errors as an indicator of reading ability[8]. Using the hiragana reading test, a time trial test to evaluate both the accuracy and speed of Japanese hiragana, it was revealed that his hiragana reading speed was significantly impaired. Moreover, his phonological weakness was indicated by significant errors in the Mora reversal test[9,10].


The findings of this evaluation resembled those associated with dyslexia, with poor decoding skills and phonological weakness. Dyslexia is characterized by reading disabilities, which are typically caused by impaired decoding skills and phonological weakness[1].


We recommended support using a strategy for children with dyslexia[11]. We insisted to use special textbooks or paper materials with enlarged letters and wider line spacing for dyslexic children. However, the patient refused to do so as he preferred to use the same equipment and materials as other children. Thus, instead, he was given a reduced load of homework and was also assigned an additional support caregiver for his class so that written materials could be read aloud for him.


Before his medical assessment, he was not an active participant in the class, and he had lost his confidence. After his disability was explained to the patient, his parents, and his teachers and classmates, and after his study environment was improved, his willingness to participate in class increased and he showed better adaptation to school activities and works.


A range of long-term developmental deficits may become apparent after perinatal brain injury, depending on the lesions present, and neuroplasticity may modify developmental outcomes[12-14]. Neonatal encephalopathy associated with hypoglycemia commonly affects the occipital lobes and posterior parietotemporal regions. It is reported to cause cortical visual impairment related to occipital lobe injury, intellectual disabilities, cerebral palsy, and intractable epilepsy[15-18]. These individuals are also reported to be at risk of learning and behavioral problems, hyperactivity, attention deficits, and autistic features at school age; however, little has been reported regarding their reading skills[16,18].

In the present case, the patient’s reading disability was evident from his significantly impaired reading speed. Although the development of his phonological awareness was significantly delayed compared to that of control children, as shown by significant errors in the mora reversal task, his phonological working memory was spared, as demonstrated by the digit span subtest score on the Wechsler Intelligence Scale for Children-Fourth Edition[9]. In addition, his reading disability was not based on ophthalmological problems or inadequate letter recognition and was demonstrated by his adequate ability to recognize Japanese Hiragana characters shown in the K-ABC II, a test that is not time-limited. Based on these details, we suspected that his reading impairment was related to decoding skill impairment caused by perinatal brain injury that involved the bilateral parietotemporal area.

Little is known regarding the effects of perinatal brain injury on reading ability in later life. Previous studies have shown that at school age, perinatal brain injuries, such as intraventricular hemorrhage, ventriculomegaly, and periventricular leukomalacia, are significant risk factors for lower academic skills (including reading performance) in extremely low birth weight children, independent of gestational age[19,20]. However, this study did not conduct further analysis of the relationship between the affected brain region and impaired reading ability. Recently, we reported a three-case series of Japanese preterm-born school-aged children with Hiragana-reading deficits. Their reading deficit was strongly suspected to be related to decoding impairment due to perinatal brain injury, specifically periventricular leukomalacia in the parietotemporal region[10]. In contrast, a case report of a girl with periventricular leukomalacia described the possibility of neuroplasticity in young children. The patient’s reading and phonological processing skills were spared, although her arcuate fasciculi were destroyed. Based on findings of multiple analyses of diffusion tensor imaging, it was speculated that her spared skills were related to other intact white matter tracts[13]. Our case findings add that perinatal injury in the parietotemporal area is a risk factor for decoding impairment, even in children born at term, while neuroplasticity may modify their outcomes.

Other factors may have affected the patient’s reading ability. First, his impaired cerebral visual perception might have affected his reading speed. Poor decoding skills and phonological awareness are recognized as typical characteristics of dyslexia, even in Japanese Hiragana readers[9,21]. However, cerebral visual impairment may affect reading ability when a visual attentional disorder or simultanagnosia are present, as well as when vision clarity, the visual field, or the ability to recognize the spelling materials are impaired[22]. We did not investigate the presence of a visual attentional skill disorder or simultanagnosia in our patient. However, it should be noted that our patient had adequate skill to recognize Hiragana letters, while his phonological awareness was poor. Second, we did not test his naming-speed skills, such as rapid automatized naming tasks. Naming-speed skill is an important factor that affects decoding fluency, reduction of which may affect reading ability even in Japanese Hiragana users[23,24]. Third, we did not exclude the possibility of spontaneous learning disorders. Finally, we did not compare his reading speed with that of full scale intelligence quotient-matched children or with those with a similar perceptual reasoning index or processing speed index. His borderline full scale intelligence quotient score may have affected his reading speed or mora reversal test results; however, this effect may be limited because a recent study has shown no difference in Hiragana non-word fluency reading scores among Japanese students with dyslexia with normal or borderline intelligence quotient[25].


School-age survivors of neonatal encephalopathy in the posterior region, involving the parietotemporal area, may be at risk of impaired reading ability even when their ophthalmologic findings are spared. Thorough assessments, including ophthalmological evaluation, psychological tests, and reading tests, are required to assess any educational support needs.


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