Gerstmann syndrome is a neurological disorder that is characterized by a constellation of symptoms[1] that suggests the presence of a lesion usually near the junction of the temporal and parietal lobes at or near the angular gyrus.

[3] Gerstmann syndrome is characterized by four primary symptoms, collectively referred to as a tetrad: This disorder is often associated with brain lesions in the dominant (usually left) hemisphere including the angular and supramarginal gyri (Brodmann area 39 and 40 respectively) near the temporal and parietal lobe junction.

The angular gyrus is generally involved in translating visual patterns of letters and words into meaningful information, such as is done while reading.

[5] In addition to exhibiting the above symptoms, many adults also experience dysphasia or aphasia,[2] which is difficulty in expressing oneself when speaking, in understanding speech, or in reading and writing.

Generally, children with the disorder exhibit poor handwriting and spelling skills, and difficulty with math functions, including adding, subtracting, multiplying, and dividing.