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  • Title: Extraosseous accumulation of (99m)Tc-HMDP to radiation nephropathy, mimicking recurrent neuroblastoma.
    Author: Abe K, Sasaki M, Kuwabara Y, Koga H, Baba S, Kaneko K, Hayashi K, Shioyama Y, Tajiri T, Suita S, Honda H.
    Journal: Ann Nucl Med; 2005 Feb; 19(1):35-40. PubMed ID: 15770971.
    Abstract:
    OBJECTIVE: The aim of this study is to clarify the period of extraosseous accumulation of (99m)Tc-hydroxymethylenediphosphonate (HMDP) to radiation nephropathy mimicking recurrent or remnant neuroblastoma in the pararenal region. METHODS: We reviewed five neuroblastoma and one ganglioneuroblastoma patients (2 boys and 4 girls aged 1-9 years) who underwent (99m)Tc-HMDP bone scintigraphies periodically before and after radiation therapy. RESULTS: Increased renal uptake coincident with the radiation port appeared in 5 of 6 patients from 0 to 3 months (mean 1.7 months), and persisted up to 7 months after the completion of radiotherapy. Renal uptake of (99m)Tc-HMDP was gradually decreased, and eventually became accumulation defects in 5 of 6 patients from 6 to 17 months (mean 8.9 months) after radiotherapy. CONCLUSION: When extraosseous accumulation is found after radiation therapy in neuroblastoma patients, radiation nephropathy would be a candidate in the differential diagnosis besides recurrent or remnant tumor.
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