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Erschienen in: European Journal of Plastic Surgery 5/2019

Open Access 30.05.2019 | Case Report

Radiation-associated angiosarcoma after autologous breast reconstruction: report of two cases in a plastic surgery unit

verfasst von: Christina Yip, Eva Weiler-Mithoff, Julie Claire Doughty, Steven J. Lo

Erschienen in: European Journal of Plastic Surgery | Ausgabe 5/2019

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Abstract

Radiation-associated breast angiosarcoma is a rare diagnosis but is commonly reported. Angiosarcoma occurring in non-breast tissue in breasts that have been reconstructed with autologous tissue following mastectomy is extremely rare. In our unit, we have managed two patients with angiosarcoma arising in non-breast tissue autologous reconstructions. Our report emphasises that any tissue treated with radiotherapy—that is, the residual mastectomy skin flaps or non-breast tissue autologous reconstructions—are at a risk of secondary angiosarcoma. We also discuss recommended surgical management, surveillance and genetic testing.
Level of Evidence is V, risk study.
Hinweise

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Radiation-associated breast angiosarcoma is a rare diagnosis but is commonly reported. Angiosarcoma occurring in non-breast tissue in breasts that have been reconstructed with autologous tissue following mastectomy is extremely rare. Thus far only one case has been reported in the literature [1]. In our unit, we have managed two patients with angiosarcoma arising in non-breast tissue autologous reconstructions. Our report emphasises that angiosarcoma can arise in breasts that have been treated with mastectomy—in residual skin flaps and in the tissue from the reconstructions themselves. We also discuss recommended surgical management, surveillance and genetic testing.

Case 1

A 61-year-old patient was diagnosed with bilateral screen-detected breast cancer and required bilateral mastectomy, axillary node sampling and immediate latissimus dorsi reconstruction in 2003. Her pathology report suggested a more advanced tumour on the right (grade 1, oestrogen positive, invasive ductal carcinoma of 22 mm), with one out of seven right axillary lymph nodes involved; she therefore required adjuvant radiotherapy (50 Gy in 25 fractions) to her right reconstructed breast and right supraclavicular fossa.
Five years post-radiotherapy, she developed a ‘bruise’ to the lower inner quadrant of her right reconstructed breast, over the mastectomy skin flap (Fig. 1). In addition to the discoloured area, there was also a small skin nodule which was clinically suspicious of angiosarcoma. An excision biopsy confirmed the diagnosis. A neo-mastectomy was warranted and the patient had chest wall reconstruction using a transposition flap (Fig. 2). This patient was a poor candidate for free abdominal tissue transfer since she had multiple abdominal surgeries for ulcerative colitis and was left with significant rectus diastasis and extensive scarring to her lower abdomen. She also suffered from asthma and did not favour a microsurgical reconstruction. Her neo-mastectomy was curative for angiosarcoma and she required no further treatment. A year after her chest wall reconstruction, the patient opted for follow-up locally by the breast surgery team. To date the patient remains disease free.

Case 2

A 71-year-old patient was diagnosed with multifocal, grade 2, oestrogen and progesterone positive, invasive ductal carcinoma of her left breast in 2007. She underwent left mastectomy, axillary node clearance (3/13 positive nodes) and immediate deep inferior epigastric perforator (DIEP) flap reconstruction. Post-surgery, she required adjuvant chemotherapy, two field radiotherapy (50 Gy in 25 fractions) to her left reconstruction and hormonal (anastrozole) therapy. In 2011, she developed a ‘bruise’ to the lower inner quadrant of her left reconstructed breast. A skin biopsy was taken and suggested benign papillary haemangioma only. The discolouration settled after the biopsy, and 5 years later (April 2017), she re-presented with a rash to the lower inner quadrant of her left reconstructed breast (Fig. 3a). A core biopsy and an excision skin biopsy were performed, which suggested a vascular process, not typical of angiosarcoma. After the biopsies, the rash had almost completely gone and the patient was then kept under close observation once every 2 months. By November 2017, she returned with a widespread purple discolouration to the skin paddle of her DIEP reconstruction that extended onto the lower mastectomy skin flap (Fig. 3b). Repeat excision biopsies suggested the presence of malignant spindle cell proliferation, which stained positively for CD31 and CD34, confirming the diagnosis of angiosarcoma. This patient was referred to the sarcoma multidisciplinary team and she required neo-mastectomy, frozen sections and immediate chest wall reconstruction with free anterolateral thigh (ALT) flap (Fig. 4). Pathology confirmed complete excision of high-grade angiosarcoma; no further treatment was indicated. Since surgery, she has been kept under regular surveillance by the sarcoma team.

Discussion

Secondary angiosarcoma of the breast, as a result of previous radiotherapy following breast conservation surgery or mastectomy, is very rare, with a reported incidence of 0.1–0.2% per year [2]. Although radiation to the breast was used therapeutically, it can also lead to DNA damage, resulting in genome instability, which in selected cases may lead to the formation of sarcoma [2]. It may have a latency period of several years prior to presentation and the initial clinical signs can be very subtle, as demonstrated in our cases. Radiotherapy contributes to a ‘field effect’ in all previously irradiated tissue; hence, clinical signs of angiosarcoma can appear on the mastectomy skin flap or on the skin paddle of the abdominal flap. It is vital to have a high index of suspicion, close monitoring of the changes in clinical signs and repeat biopsies as necessary, in order to diagnose secondary angiosarcoma.
Feinberg et al. recently reviewed the impact of early specialist management on survival from angiosarcoma and suggested that patients managed initially by the sarcoma team have fewer local recurrences and significant improved disease-specific survival [3]. Higher rates of positive margins have been seen with wide local excision, and specialist sarcoma units such as the Royal Marsden suggest radical excision [4]. Excision of the field change associated with previously irradiated tissue may lead to better local control, reducing the incidence of future local recurrence [3]. Our surgical approach to radiation-associated angiosarcoma is similar to Feinberg et al.: we advocate radical neo-mastectomy rather than wide local excision, frozen section for margin analysis and chest wall reconstruction. Follow-up is in keeping with the Scottish Sarcoma National Follow-Up guidelines with 4 monthly clinical assessment, chest X-ray and annual regional imaging [5]. Genetic testing should be considered in this group of patients, as pre-existing genetic abnormalities such as BRCA and p53 mutations may potentiate the carcinogenic effects of irradiation, leading to secondary angiosarcoma [68].
The cases we describe here indicate that angiosarcoma can occur in breasts that have been treated with mastectomy, and that breast tissue itself is not a pre-requisite for angiosarcoma formation. Any tissue treated with radiotherapy—that is, the residual mastectomy skin flaps or non-breast tissue autologous reconstructions—are at a risk of secondary angiosarcoma. It is essential that the treating breast clinician is aware of this rare but critical possibility.

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Conflict of interest

None.

Ethical approval

Not applicable.
Obtained and consented.
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Metadaten
Titel
Radiation-associated angiosarcoma after autologous breast reconstruction: report of two cases in a plastic surgery unit
verfasst von
Christina Yip
Eva Weiler-Mithoff
Julie Claire Doughty
Steven J. Lo
Publikationsdatum
30.05.2019
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Plastic Surgery / Ausgabe 5/2019
Print ISSN: 0930-343X
Elektronische ISSN: 1435-0130
DOI
https://doi.org/10.1007/s00238-019-01536-8

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