Stereotactic Body Radiotherapy for Metachronous Multisite Oligo-Recurrence: A Long-Surviving Case with Sequential Oligo-Recurrence in Four Different Organs Treated Using Locally Radical Radiotherapy and a Review of the Literature
(a) CT of right adrenal metastasis (arrow) before SBRT. (b) Dose distribution made with 10 noncoplanar beams for SBRT. Isodose lines show total doses (in 25 fraction) of 70 Gy, 60 Gy, 50 Gy, and 40 Gy, in 10 fractions, respectively, from the innermost area. The 30-Gy isodose line overlapped at the second portion of the duodenum with the 40-Gy isodose line of the SBRT for right adrenal metastasis, resulting in grade 2 duodenitis 1 month after SBRT. (c) CT at 6 months after SBRT, showing partial response of the lesion (arrow).