FIGURE 2.

PLG of tumor-positive LNs. (A and B) Patient 5, with serous endometrial cancer, in whom time–activity curve of left obturator SLN demonstrated prolonged ¹⁸F-FDG uptake in shoulder (A); this corresponded to left obturator SLN, which was removed in OR and revealed 2 micrometastatic tumor foci measuring 2 and 3 mm on final pathology (B). Right obturator PLG SLN was also identified and removed in OR. This node did not demonstrate prolonged uptake (or rapid decrease) on time–activity curve, was interpreted as negative on PLG, and was found to be positive on final pathology, with 11-mm metastatic tumor focus. (C and D) Patient 15, with stage IBI cervical adenocarcinoma, showing unilateral PLG mapping with delayed washout of ¹⁸F-FDG from right external iliac/obturator SLN (C); this resected specimen contained 2 LNs, 1 of which was positive for tumor cells on final pathology (D).