Recurrent Solitary Fibrous Tumor in Intradural Extramedullary Space: Case Report and Review of the Literature

Table 1

Comparison of treatment plans.

	PTV			Spinal cord	Lung			Esophagus		Monitor unit (MU)
	D50 (cGy)	D98 (cGy)	D2 (cGy)	D2 (cGy)	V20 (%)	V5 (%)	Mean (cGy)	33% (cGy)	Mean (cGy)
3D	5370	5090	5468	5437	1.7	12.5	230	839	562	455
IMRT (5 field)	5182	5067	5302	5226	2	10	190	385	255	1353
ARC	5200	4950	5333	5220	1	12	207	540	326	1060

3D: conformal three-dimensional; IMRT: intensity-modified radiation therapy; ARC: volumetric modulated arc therapy; PTV: planning target volume; D95: dose covering 95% of the PTV; D50: median dose, D98: near-minimum dose, D2: near-maximum dose; cGy: centigray; V20: lung volume that received a dose of 20 Gy or more; V5: lung volume that received a dose of 5 Gy or more; 33%: dose received by 33% of esophagus.