Abstract
A 60-year-old man with progressive gait ataxia and mild pyramidal signs showed at MRI a pontine lesion with post-contrast enhancement in the left middle cerebellar peduncle. Diagnosis of Erdheim-Chester disease (ECD), a rare non-Langerhans cell histiocytosis, was suggested, further supported by a previously diagnosed retroperitoneal fibrosis. X-ray films demonstrated characteristic bilateral and symmetric osteosclerosis of the long bones of the lower limbs, which at radionuclide studies exhibited a marked increase in technetium-99 uptake. A cerebral 18FDG-PET showed a relevant pontine uptake of the tracer. Re-evaluation of a past retroperitoneal biopsy showed an intense CD68+, CD1a-, and S100- infiltrate of histiocytes with foamy cytoplasm, thus confirming the diagnosis. ECD should be regarded as a rare cause of adult-onset sporadic ataxia, especially when pontine lesions and extraneurological manifestations are present.
MeSH terms
-
Afferent Pathways / pathology
-
Afferent Pathways / physiopathology
-
Biomarkers / analysis
-
Biomarkers / metabolism
-
Bone and Bones / diagnostic imaging
-
Bone and Bones / pathology
-
Brain Mapping
-
Cerebellar Ataxia / diagnostic imaging
-
Cerebellar Ataxia / etiology*
-
Cerebellar Ataxia / pathology
-
Cerebellum / pathology
-
Cerebellum / physiopathology
-
Disease Progression
-
Erdheim-Chester Disease / complications*
-
Erdheim-Chester Disease / diagnosis
-
Erdheim-Chester Disease / physiopathology
-
Fluorodeoxyglucose F18
-
Hearing Loss, Central / etiology
-
Hearing Loss, Central / pathology
-
Hearing Loss, Central / physiopathology
-
Histiocytes / immunology
-
Histiocytes / pathology
-
Humans
-
Magnetic Resonance Imaging
-
Male
-
Middle Aged
-
Orbit / pathology
-
Orbit / physiopathology
-
Pons / diagnostic imaging
-
Pons / pathology*
-
Pons / physiopathology
-
Positron-Emission Tomography
-
Retroperitoneal Fibrosis / etiology*
-
Retroperitoneal Fibrosis / pathology
-
Retroperitoneal Fibrosis / physiopathology
-
Technetium
Substances
-
Biomarkers
-
Fluorodeoxyglucose F18
-
Technetium