Document Detail


False-positive accumulation of metaiodobenzylguanidine in a case with acute intermittent porphyria.
MedLine Citation:
PMID:  21532227     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
We report a 36-year-old woman presenting with hypertensive encephalopathy followed by bulbar palsy and quadriplegia. After an extensive screening for secondary causes of hypertension, the patient was suspected of having pheochromocytoma due to increased levels of catecholamines in the plasma and the urine, and positive (131)I-metaiodobenzylguanidine (MIBG) accumulation in the gallbladder. However, MIBG accumulation was not reproducible without any tumors accompanying this accumulation in the gallbladder. A diagnosis of acute intermittent porphyria was finally confirmed based on the characteristic pictures, increased urinary excretion of porphobilinogen, and identification of a heterozygous missense mutation of R173W in the hydroxymethylbilane synthase gene. This case highlights a pitfall in utilizing MIBG to detect a source of excessive catecholamine and also suggests the importance of having a complete clinical history and extensive work-up of any possible differential diagnosis. We also review the potential mechanism by which false-positive MIBG accumulation occurs.
Authors:
Tomoko Masuda; Rie Ota; Takao Ando; Naoto Maeda; Yutaka Horie; Toshiro Yoshimura; Masakatsu Motomura; Atsushi Kawakami
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Publication Detail:
Type:  Journal Article     Date:  2011-05-01
Journal Detail:
Title:  Internal medicine (Tokyo, Japan)     Volume:  50     ISSN:  1349-7235     ISO Abbreviation:  Intern. Med.     Publication Date:  2011  
Date Detail:
Created Date:  2011-05-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9204241     Medline TA:  Intern Med     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  1029-32     Citation Subset:  IM    
Affiliation:
The First Department of Medicine, Nagasaki University Graduate School of Biomedical Sciences, Japan.
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