Key result
Chronic PICA infarction links to ~40% reduction in inferior cerebellar peduncle diameter on MRI.
Why the study?
Unilateral inferior cerebellar peduncle atrophy is an uncommon, subtle neuroradiological finding that can easily be overlooked on routine brain MRI.
Case Report (n=1)
No
Systematic scrutiny and quantitative measurement of the cerebellar peduncles on brain MRI can identify focal atrophy from chronic PICA infarction as a structural correlate for otherwise cryptogenic chronic vestibular symptoms.
Answers are grounded in this paper and cite their sources.
Quantitative peduncle measurements on MRI may identify chronic PICA infarction in unexplained vertigo; leaves open prospective validation before routine use.
Unilateral inferior cerebellar peduncle (ICP) atrophy is an uncommon, subtle neuroradiological finding that can easily be overlooked on routine brain MRI [2]. We present the case of a 55-year-old female who presented with a 1-year history of persistent vertigo, imbalance, and intermittent headache [8, 12]. Magnetic resonance imaging demonstrated marked asymmetric atrophy of the left ICP, measuring 5.29 mm at its midpoint compared with 8.82 mm on the preserved right side (a ~ 40% reduction in transverse diameter), alongside complete loss of its distal tract and compensatory ex vacuo CSF space expansion in the left cerebellopontine angle cistern [8, 10, 16]. These findings reflect chronic ischemic insult in the posterior inferior cerebellar artery (PICA) territory complicated by secondary Wallerian degeneration [4, 11, 14]. This case emphasizes the clinical necessity of systematically scrutinizing the cerebellar peduncles and utilizing quantitative metrics when evaluating chronic vestibular symptoms [12, 16].
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Aminu et al. (2026) conducted a case report in Chronic posterior inferior cerebellar artery (PICA) territory infarction presenting with isolated inferior cerebellar peduncle atrophy (n=1). Brain magnetic resonance imaging (MRI) with quantitative caliper measurement vs. Contralateral preserved right inferior cerebellar peduncle was evaluated on Transverse diameter of the inferior cerebellar peduncle (ICP) at the mid-medullary level. Quantitative brain MRI revealed a ~40% reduction in the left inferior cerebellar peduncle transverse diameter (5.29 mm vs 8.82 mm on the right) due to chronic PICA infarction.
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