# When a Large Left Hemisphere Stroke is All Right for Language, Praxis, and Visual Attention: A Case Report

## TL;DR

A rare case shows that language, praxis, and visual attention can remain intact after a large left hemisphere stroke due to right hemisphere dominance.

## Contribution

This case report presents a rare example of 'crossed non-aphasia' with simultaneous right-hemisphere lateralization of multiple functions.

## Key findings

- The patient had intact language and praxis despite a large left hemisphere stroke.
- fMRI showed right-hemisphere dominance for language and preserved visuospatial cognition.
- The case supports the possibility of independent lateralization of multiple brain functions.

## Abstract

To describe a rare case of large left hemisphere (LH) middle cerebral artery (MCA) stroke with intact language, praxis, visuospatial cognition, and attention, suggesting lateralization of all these functions to the intact right hemisphere (RH).

A 53-year-old right-handed woman who had a stroke at age 42 was enrolled in a study of long-term stroke outcomes. She underwent standardized behavioral assessments and functional MRI (fMRI) with a visual field test and an adaptive semantic matching task.

Despite a 432 cm3 area of encephalomalacia, encompassing both MCA and posterior anterior cerebral artery territories of the LH, she exhibited intact language both acutely and chronically (Western Aphasia Battery Aphasia Quotient = 99.2) and normal praxis. fMRI demonstrated right-hemisphere dominance for language. Visuospatial cognition and attention were preserved (WASI II-Block Design; Behavioral Inattention Test-conventional subtests) despite right hemianopia.

This case suggests that language, praxis, and visuospatial functions can simultaneously lateralize to the RH. Although previous cases report reciprocal hemispheric reorganization, such as in crossed aphasia, this case of “crossed non-aphasia” supports the view that lateralization of functions can occur independently. Clinically, this rare pattern of atypical lateralization should be considered when expected poststroke deficits are absent.