Arm-Behind-the-Back Position for Breast Cancer Radiotherapy in Patients with Lupus Erythematosus and Shoulder Arthropathy: A Case Report

24 April 2025 : Case report Japan

Unusual setting of medical care

Shoki Nakamura^12ABCDEF, Kota Fujii

^1ABCDEF*, Mami Sakai^3CDEF, Keisuke Sakai^1DE, Hideki Hanazawa

^1DE, Keisuke Nishimura

^4DE, Kenji Notohara

^5BDE, Kazushige Yamaguchi^6DE, Satoshi Itasaka

^1ABCDE

DOI: 10.12659/AJCR.946674

Am J Case Rep 2025; 26:e946674

Introduction Case Report Discussion Conclusions References:

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Table 1. Detail of the plans in the regular supine and the arm-behind-the-back position.

	Regular supine position	Arm-behind-the-back position
Size of irradiation field [cm×cm]	8.9×17.0	8.4×17.0
Beam gantry angle [degrees]	126 and 304	130 and 308
Beam collimator angle [degrees]	15	8
Dmean of PTV [Gy]	42.56	42.56
D2 of PTV [Gy]	44.72	44.80
D50 of PTV [Gy]	42.79	42.79
D98 of PTV [Gy]	39.91	38.16
HI	0.112	0.155
Central lung distance [cm]	2.1	0.6
Dmean of left lung [Gy]	2.44	1.30
Dmean of heart [Gy]	1.50	1.08
PTV – planning target volume; D – mean dose; DX – minimum dose received by the hottest X% of the volume; HI – homogeneity index (=(D-D)/D).

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