Histopathology revealed a Grade 2, 19-mm IDC. There was
no lymphovascular invasion and radial margins were clear by
.10 mm. The deep margin was 2 mm, but the anterior subcutaneous
margin was 0 mm. In view of the positive anterior
margin the patient proceeded to adjuvant radiotherapy.
The patient underwent a CT planning scan to assess the
depth of tissue to be treated. A 10 7 cm rectangular electron
field was applied to the tumour bed incorporating the excision
scar. The patient was then treated with 9 megavoltage (MEV)
electrons to a dose of 40 Gy in 15 fractions, over 21 days