Which type of breast cancers is undetectable on ring-type dedicated breast PET?

Publication date: September–October 2018
Source:Clinical Imaging, Volume 51
Author(s): Shinsuke Sasada, Norio Masumoto, Noriko Goda, Keiko Kajitani, Akiko Emi, Takayuki Kadoya, Morihito Okada
ObjectivesTo assess the factors causing tumor undetectability on ring-type dedicated breast positron emission tomography (DbPET).MethodsA total of 265 patients (288 tumors) underwent DbPET and contrast-enhanced magnetic resonance imaging (MRI) in a prone position. The distance between the shallowest part of the breast tumor and the front end of the pectoralis major muscle on MRI was considered as the tumor-to-chest wall distance.ResultsTwenty-four tumors (8.3%) were not visualized via DbPET. The tumor-to-chest wall distance for undetectable tumors was shorter than that of the detectable tumors (23.0 mm vs 38.5 mm, P < 0.001). Multivariate analysis indicated that proximity to the chest wall and low-grade tumors were independent predicting factors for undetectable cancers. Among the 24 undetectable cancers, 15 tumors were proximal to the chest wall, suggesting that they were outside or at the edge of field of view (FOV), and 7 were low-grade tumors, suggesting insignificant ¹⁸F-fluorodeoxyglucose (FDG) uptake.ConclusionsThe factors of undetectable breast cancers on DbPET are classified into two types; outside or at the edge of FOV and insignificant FDG uptake.



https://ift.tt/2L99Rzp