CASE 15028 Published on 21.09.2017

Unilateral cerebellar hypoplasia - A case report

Section

Neuroradiology

Case Type

Clinical Cases

Authors

Madhuri Ghate, Rashmi Kotkar, Amol Gulhane

Krsna Diagnostics Pvt Ltd;
Pawana Nagar housing society
411033 Chinchwad, India;
Email: madhuri.ghate01@gmail.com

Patient

2 months, male

Categories

Area of Interest Neuroradiology brain ; Imaging Technique MR

Procedure Education ; Special Focus Seizure disorders ;

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Clinical History

A 2-month-old male child presented with seizures.

Imaging Findings

Plain MRI brain was advised which showed that the left cerebellar hemisphere was hypoplastic and was smaller in size compared to the right side (Fig. 1, 2, 3 and 4 - red arrow). The grey and white matter of the cerebellum was normal and did not show any signal changes. The fourth ventricle was normal. The cisterna magna was normal. The vertebral and basilar arteries showed normal flow voids.

Discussion

Cerebellar malformations are classified into two categories: hypoplasias and dysplasias [1].
Hypoplasias: Those associated with hypoplasia have reduced cerebellar volume.
Dysplasias: they have abnormal foliation, and abnormal architecture of the cerebellar white matter.
Cerebellar hypoplasias are classified as focal or generalised. Focal being further classified into isolated vermian hypoplasia and hypoplasia of one cerebellar hemisphere.
Patients with unilateral cerebellar hypoplasia can be asymptomatic or can present with cerebellar symptoms, headache or rarely with seizure [2].
Aetiopathogenesis is postulated as intrauterine or perinatal vascular insult. Hence hypoplasia or aplasia of the cerebellar or vertebral arteries can be seen in these cases [3, 4]. Intrauterine insult can be a prenatal haemorrhagic lesion, as cerebellum is vulnerable to bleeding during fetal development, which can be diagnosed on prenatal fetal MRI [5]. Intrauterine insult may be due to congenital cytomeglovirus infection, maternal diabetes mellitus, maternal alcohol addiction and placental thrombotic vasculopathy and infarctions. Other factors may play a role in aetiopathogenesis like genetic mutations with somatic mosaicism.
Cerebellar hypoplasia can have syndromic association with PHASES syndrome (posterior fossa anomalies, haemangioma, arterial anomalies, cardiac abnormalities/aortic coarctation, eye abnormalities) syndrome [6] and Mobius syndrome.
In present case, there was no other structural abnormality found except for isolated unilateral cerebellar hypoplasia.

Differential Diagnosis List

Unilateral cerebellar hypoplasia.

Global cerebellar hypoplasia

Cerebellar hypoplasia with mainly vermis involvement

Final Diagnosis

Unilateral cerebellar hypoplasia.

References

[1] Barkovich AJ, Millen KJ, Dobyns WB (2009) A developmental and genetic classification for midbrain-hindbrain malformations. Brain 132(Pt 12):3199-230 (PMID: 19933510)

[2] Simon M, Kafritsas D (1992) Unilateral cerebellar hypoplasia. Clin Neuropathol 11(2):71-3 (PMID: 1606782)

[3] Granados-Alzamora V, Pascual-Pascual SI, Pascual-Castroviejo I (2003) Unilateral cerebellar hypoplasia: an alteration of vascular origin?. Rev Neurol 1-15;36(9):841-5 (PMID: 12717672)

[4] Sargent MA, Poskitt KJ, Roland EH, Hill A, Hendson G (2004) Cerebellar vermian atrophy after neonatal hypoxic-ischemic encephalopathy. AJNR Am J Neuroradiol 25(6):1008-15 (PMID: 15205139)

[5] Martino F, Malova M, Cesaretti C, Parazzini C, Doneda C, Ramenghi LA, Rossi A, Righini A (2016) Prenatal MR imaging features of isolated cerebellar haemorrhagic lesions. Eur Radiol 26(8):2685-96 (PMID: 26474987)

[6] Massoud M, Cagneaux M, Garel C, Varene N, Moutard ML, Billette T, Benezit A, Rougeot C, Jouannic JM, Massardier J, Gaucherand P, Desportes V, Guibaud L (2014) Prenatal unilateral cerebellar hypoplasia in a series of 26 cases: significance and implications for prenatal diagnosis. Ultrasound Obstet Gynecol 44(4):447-54 (PMID: 24185815)

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