Biomaterial Database

[Alexia without agraphia, colour "agnosia" and right visual field defect: a syndrome of the posterior cerebral artery (author's transl)]. 1979

J M Orgogozo, and J J Pere, and E Strube

Two cases of alexia without agraphia are reported, with differences in the characters of the alexia and in the accompanying signs. The visual field defect was limited to quadranopia in both cases which was upper quadrantic and mild in one, lower quadrantic and severe in the other. These differences make it unlikely that a similar anatomical location of the lesion and a unique mechanism are responsible of all cases of alexia without agraphia. Persistance of visual inputs in the right visual field is partial in our cases, but alexia without hemianopsia does exist. These facts are against the mechanism of "splenio-cortical" disconnection proposed by Geschwind as the only explanation. A "cortical", or agnosic mechanism has been also claimed, with lesions of the lingual and fusiform gyri on the dominant side, as well as "subangular", mechanism, with intrahemispheric disconnection by a lesion located between the visual associative areas and the angular gyrus: in these last two situations an hemianopsia is not necessarily associated to the alexia without agraphia.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D002536	Cerebral Arteries	The arterial blood vessels supplying the CEREBRUM.	Arteries, Cerebral,Artery, Cerebral,Cerebral Artery
D003116	Color	The visually perceived property of objects created by absorption or reflection of specific wavelengths of light.	Colors
D004411	Dyslexia, Acquired	A receptive visual aphasia characterized by the loss of a previously possessed ability to comprehend the meaning or significance of handwritten words, despite intact vision. This condition may be associated with posterior cerebral artery infarction (INFARCTION, POSTERIOR CEREBRAL ARTERY) and other BRAIN DISEASES.	Alexia, Acquired,Reading Disability, Acquired,Word Blindness, Acquired,Acquired Global Dyslexia,Acquired Spelling Dyslexia,Acquired Alexia,Acquired Dyslexia,Acquired Reading Disabilities,Acquired Reading Disability,Acquired Word Blindness,Acquired Word Blindnesses,Blindness, Acquired Word,Blindnesses, Acquired Word,Disabilities, Acquired Reading,Disability, Acquired Reading,Dyslexia, Acquired Global,Dyslexia, Acquired Spelling,Global Dyslexia, Acquired,Reading Disabilities, Acquired,Spelling Dyslexia, Acquired,Word Blindnesses, Acquired
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000377	Agnosia	Loss of the ability to comprehend the meaning or recognize the importance of various forms of stimulation that cannot be attributed to impairment of a primary sensory modality. Tactile agnosia is characterized by an inability to perceive the shape and nature of an object by touch alone, despite unimpaired sensation to light touch, position, and other primary sensory modalities.	Auditory Agnosia,Finger Agnosia,Sensory Agnosia,Tactile Agnosia,Visual Agnosia,Agnosia for Pain,Agnosia for Smell,Agnosia for Taste,Agnosia for Temperature,Anosognosia,Auditory Agnosia, Congenital,Body-Image Agnosia,Congenital Auditory Agnosia,Developmental Agnosia,Gustatory Agnosia,Ideational Agnosia,Olfactory Agnosia,Position Agnosia,Somatosensory Agnosia,Time Agnosia,Topographical Agnosia,Visual Agnosia for Objects,Visual Disorientation Syndrome,Visuospatial Agnosia,Agnosia for Tastes,Agnosia, Auditory,Agnosia, Body-Image,Agnosia, Congenital Auditory,Agnosia, Developmental,Agnosia, Finger,Agnosia, Gustatory,Agnosia, Ideational,Agnosia, Olfactory,Agnosia, Position,Agnosia, Sensory,Agnosia, Somatosensory,Agnosia, Tactile,Agnosia, Time,Agnosia, Topographical,Agnosia, Visual,Agnosia, Visuospatial,Agnosias,Agnosias, Auditory,Agnosias, Body-Image,Agnosias, Congenital Auditory,Agnosias, Developmental,Agnosias, Finger,Agnosias, Ideational,Agnosias, Olfactory,Agnosias, Position,Agnosias, Sensory,Agnosias, Somatosensory,Agnosias, Tactile,Agnosias, Time,Agnosias, Topographical,Agnosias, Visual,Agnosias, Visuospatial,Anosognosias,Auditory Agnosias,Auditory Agnosias, Congenital,Body Image Agnosia,Body-Image Agnosias,Congenital Auditory Agnosias,Developmental Agnosias,Finger Agnosias,Ideational Agnosias,Olfactory Agnosias,Position Agnosias,Sensory Agnosias,Somatosensory Agnosias,Syndrome, Visual Disorientation,Syndromes, Visual Disorientation,Tactile Agnosias,Time Agnosias,Topographical Agnosias,Visual Agnosias,Visual Disorientation Syndromes,Visuospatial Agnosias
D001157	Arterial Occlusive Diseases	Pathological processes which result in the partial or complete obstruction of ARTERIES. They are characterized by greatly reduced or absence of blood flow through these vessels. They are also known as arterial insufficiency.	Arterial Obstructive Diseases,Arterial Occlusion,Arterial Obstructive Disease,Arterial Occlusions,Arterial Occlusive Disease,Disease, Arterial Obstructive,Disease, Arterial Occlusive,Obstructive Disease, Arterial,Occlusion, Arterial,Occlusive Disease, Arterial
D013577	Syndrome	A characteristic symptom complex.	Symptom Cluster,Cluster, Symptom,Clusters, Symptom,Symptom Clusters,Syndromes
D014786	Vision Disorders	Visual impairments limiting one or more of the basic functions of the eye: visual acuity, dark adaptation, color vision, or peripheral vision. These may result from EYE DISEASES; OPTIC NERVE DISEASES; VISUAL PATHWAY diseases; OCCIPITAL LOBE diseases; OCULAR MOTILITY DISORDERS; and other conditions (From Newell, Ophthalmology: Principles and Concepts, 7th ed, p132).	Hemeralopia,Macropsia,Micropsia,Day Blindness,Metamorphopsia,Vision Disability,Visual Disorders,Visual Impairment,Blindness, Day,Disabilities, Vision,Disability, Vision,Disorder, Visual,Disorders, Visual,Hemeralopias,Impairment, Visual,Impairments, Visual,Macropsias,Metamorphopsias,Micropsias,Vision Disabilities,Vision Disorder,Visual Disorder,Visual Impairments