Radioiodine therapy for thyroid cancer depicted uterine leiomyoma.
A 55-year-old woman underwent radioiodine therapy for papillary carcinoma of the thyroid. Post-therapeutic I-131 scan revealed radioiodine uptake in the pelvic region and in the thyroid bed. CT revealed a huge mass connected to the uterus. The tumor was operated on and histologically proven to be a leiomyoma of the uterus. Some physiological conditions or nonthyroidal diseases can cause false positives in patients with postoperative thyroid cancer. We suggest that uterine leiomyoma might be added to the pitfall list, although the mechanism of I-131 uptake remains unclear.
Department of Nuclear Medicine, Graduate School of Medicine, Sapporo, Japan. khirata@med.hokudai.ac.jp
Kenji
K
Hirata
Tohru
T
Shiga
Kanako C
KC
Kubota
Shozo
S
Okamoto
Tomohito
T
Kamibayashi
Nagara
N
Tamaki
D002291:Carcinoma, Papillary / Q000000981:diagnostic imaging / Q000378:metabolism / Q000532:radiotherapy*; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes / Q000378:metabolism* / Q000627:therapeutic use*; D007889:Leiomyoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000378:metabolism; D008875:Middle Aged; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging / Q000378:metabolism / Q000532:radiotherapy*; D014057:Tomography, X-Ray Computed; D014594:Uterine Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000378:metabolism
D007457:Iodine Radioisotopes