Unexpected I-123 FP-CIT Uptake in a Brain Tumor

Extrastriatal Accumulation of 18F-FP-CIT at Cerebral Infarction in a Patient With Suspected Parkinson Disease

ABSTRACT

18F-FP-CIT PET/CT is a useful diagnostic tool for differentiating between idiopathic Parkinson disease and atypical Parkinson syndrome by visualizing the striatum, where the nerve endings of nigrostriatal dopaminergic neurons are located. We present an unusual accumulation of 18F-FP-CIT in the infarct and peri-infarct brain area of an 83-year-old man who was referred for the management of suspected cerebral infarction due to sudden dysarthria and delirium.

Cerebral Infarction With Increased Uptake on 123I-FP-CIT SPECT

ABSTRACT

A 76-year-old woman underwent 123I-FP-CIT brain SPECT due to postural reflex impairment. The transverse slices demonstrated increased uptake in the right middle cerebral artery territory. MR images obtained 2 weeks earlier showed cerebral infarction in the corresponding area. 123I-FP-CIT has high binding affinity for dopamine transporters, especially in the nerve endings of nigrostriatal dopaminergic neurons.

Anaplastic Oligodendroglioma Found as an Incidental Photopenic Lesion on 18F-FP-CIT PET/CT Image

F-FP-CIT PET is a useful modality for imaging dopamine transporters. It has excellent resolution compared with I-beta-CIT SPECT and is widely used clinically for the evaluation of Parkinson disease. In general, the main focus of F-FP-CIT PET imaging is the basal ganglia, and it is important to observe whether F-FP-CIT uptake is normal in the putamen and caudate nuclei. However, abnormal findings may be seen in other brain regions besides the basal ganglia. Here, we present a case of anaplastic oligodendroglioma, a high-grade tumor, which was found as an incidental photopenic lesion on F-FP-CIT PET/CT.

Incidental detection of intracranial tuberculomas on (99m)Tc-TRODAT-1 SPECT/CT

Tc-TRODAT-1 has high affinity and specificity for dopamine transporters and is useful for the evaluation of presynaptic dopaminergic function, especially in parkinsonism. There have been a few reports of extrastriatal pathological accumulation of Tc-TRODAT-1. We report a patient with intracranial tuberculomas that were incidentally detected when he underwent Tc-TRODAT-1 scintigraphy for an unrelated indication.

Pituitary macroadenoma on 99mTc-TRODAT-1 brain SPECT

Dopamine transporter (DAT) radiopharmaceuticals are capable of binding to the DAT with high selectivity, especially in the corpora striata, and have been widely used to evaluate parkinsonian disorder. However, only a few reports have mentioned about the extrastriatal pathologic DAT uptake. Herein we present an interesting case about the incidental discovery of pituitary macroadenoma with intense uptake of 99mTc-TRODAT-1.