In case of amyloidosis and polyneuropathy of uncertain cause a paraneoplastic pathogenesis should be considered in the differential diagnosis, even in the absence of proven malignancy.
A 51-year-old patient with severe back pain had undergone resection of a benign cerebellar tumour when aged 15 years. In addition, polycystic kidney disease was diagnosed 24 years ago, bilateral phaeochromocytoma 2 years ago, and for 4 months before the present admission he had been on haemodialysis. The family history indicated autosomal dominant inheritance of the polycystic renal disease. His general condition was found to have deteriorated, he had pain on pressure over the upper thoracic and lower lumbar vertebrae, and the kidneys were enlarged on palpation. There were increased concentrations of calcium (3.01 mmol/l), parathormone (2.0 ng/l), carcinoembryonic antigen (13.5 micrograms/l) and TPA (69 U/l). Computed tomography demonstrated cystic and solid parts of much enlarged kidneys. Biopsy revealed a poorly differentiated clear-cell renal carcinoma. Further information concerning the previously removed brain tumour showed this to have been an haemangioblastoma of the cerebellar tonsils indicating the diagnosis of v. Hippel-Lindau disease. Nine other family members had been affected, but none had the full-blown picture of the disease. The patient died 3 weeks later from the rapidly advancing tumour. Autopsy showed the bilateral renal carcinoma, bilateral phaeochromocytoma and metastases to the sternum, femurs, vertebrae and liver.
An 8 year old girl presented with progressive change of personality and spastic ataxia since 4 weeks. A year before she had developed focal grand-mal-seizures; at this time laboratory and radiologic findings were normal. The EEG on admission demonstrated marked changes with partially focal, partially generalized hypersynchronic activity, but no SSPE-typical Radermecker-complexes. There were no cells in the cerebrospinal fluid (CSF), a slightly increased level of protein and a normal glucose. Isoelectric focusing showed predominantly measles-specific oligoclonal IgG bands in the CSF. In the magnetic resonance tomography multiple focal white matter lesions in the basal ganglia as well as in cortical and occipitoparietal regions could be seen. At the age of two the girl had suffered from measles, the child didn't receive any vaccination. The combination of history, CSF-, MRI-results and EEG lead to the diagnosis of subacute sclerosing panencephalitis (SSPE). After 3 months the clinical and radiological abnormalities had markedly increased. On the background of this history SSPE should be considered as differential diagnosis in patients with changes of personality.
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