J Korean Soc Radiol.  2017 Oct;77(4):249-253. 10.3348/jksr.2017.77.4.249.

Transient ¹⁸F-Fluorodeoxyglucose Activity on PET/CT of Herniation Pit in Thyroid Cancer Patient: A Case Report

Affiliations
  • 1Department of Nuclear Medicine, Eulji University Hospital, Daejeon, Korea.
  • 2Department of Radiology, The Catholic University of Korea, Daejeon St. Mary's Hospital, Daejeon, Korea. greempark@gmail.com

Abstract

A herniation pit is a benign bone pit characterized by its femoral location and surrounding sclerotic margin. Few reports have been issued on the fluorodeoxyglucose (FDG) positron emission tomography findings of herniation pit. Here, we report the unique case of a thyroid cancer patient, having a herniation pit showing transient FDG uptake, which mimicked bone metastasis.


MeSH Terms

Femur Head
Femur Neck
Fluorodeoxyglucose F18
Humans
Neoplasm Metastasis
Positron-Emission Tomography
Positron-Emission Tomography and Computed Tomography*
Thyroid Gland*
Thyroid Neoplasms*
Fluorodeoxyglucose F18

Figure

  • Fig. 1. Transient 18 F-FDG activity of herniation pit, in a 53-year-old woman with thyroid cancer. A. PET/CT fusion image shows a focal hypermetabolism in the left anterolateral femoral head. B. CT bone setting finding, which corresponds to the location of the hypermetabolic lesion, shows no definite abnormality. C. After 3 weeks, axial CT of pelvic bone shows a small hypodense lesion without a sclerotic rim, in the left anterolateral femoral head. D. Bone scan shows focal increased uptake in the left lateral femoral head. CT = computed tomography, FDG = fluorodeoxyglucose, PET = positron emission tomography. Transient 18 F-FDG activity of herniation pit, in a 53-year-old woman with thyroid cancer. E. MR T1-weighted (left), T2-weighted (middle), contrast enhanced T1-weight (right) images. T1 weighted image shows ill defined low SI lesion in the anterosuperior femoral head/neck junction. T2-weighted image shows high SI with adjacent marrow edema. Contrast enhanced T1-weighted image shows focal rim enhancing lesion with mild diffuse enhancement of marrow. F, G. Follow up PET/CT images after 9 months show no FDG uptake (F), and a hypodense lesion with a sclerotic border in the left anterolateral femo-ral head, characteristic of a herniation pit (G). CT = computed tomography, FDG = fluorodeoxyglucose, PET = positron emission tomography, SI = signal intensity


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