MEDRADSC 3S03 Lecture Notes - Lecture 3: Melanoma, Cosmesis, Angiosarcoma

• School: McMaster University
• Department: Medical Radiation Sciences
• Course: MEDRADSC 3S03
• Professor: Dawn Danko

Document Summary

Malignant melanoma (mm: 1. 5% of skin cancers. Non-melanomas (nmsc: bcc: most common, 65% of skin cancers, scc: 30% of skin cancers, others: cuta(cid:374)eous ly(cid:373)pho(cid:373)a, kaposi(cid:859)s sarco(cid:373)a, a(cid:374)giosarco(cid:373)a, (cid:373)erkel cell tumours, mycosis fungoides. Overview of trt options: one of the primary treatments, lymph nodes involved, rt to shrink large tumors. Benign conditions: keloids, warts, actinic karatosis (pre-malignant) Rt(t) of superficial tumours: important insights gained from the research. A geographic miss is the most common cause of treatment failure with skin cancers: treatment depth is not deep enough, inappropriate energy. The deep margin of the tumour is more often underestimated by the surgeon than the lateral margins. Inadequate deep margins are more likely to be followed by recurrence than inadequate lateral margins. Lesions involving bone or cartilage (risk of radionecrosis, cure rates lower: photoelectric energy depends on the atomic number, bone absorbs far more dose than the skin lesions radionecrosis. Depends on specific characteristics; categorized according to low vs high risk.