|Year : 2011 | Volume
| Issue : 1 | Page : 43-45
Radiotherapy on hidradenocarcinoma
Issam Lalya1, Khalid Hadadi2, El Mehdi Tazi3, Ilham Lalya4, Amine Bazine2, Khalid Andaloussy2, Mohamed Elmarjany2, Hassan Sifat2, Khalid Hassouni3, Tayeb Kebdani3, Hamid Mansouri2, Noureddine Benjaafar3, Brahim Khalil Elgueddari3
1 Department of Radiotherapy, Military Hospital Mohamed V; Department of Radiotherapy, National Institute of Oncology, Rabat, Morocco
2 Department of Radiotherapy, Military Hospital Mohamed V, Rabat, Morocco
3 Department of Radiotherapy, National Institute of Oncology, Rabat, Morocco
4 Department of Head and Neck Surgery, Casablanca, Morocco
|Date of Web Publication||9-Nov-2011|
National Institute of Oncology, Mohamed V University, Rabat
Source of Support: None, Conflict of Interest: None
Context : Clear cell Hidradenocarcinoma is a rare carcinoma arising from sweat glands. It is an aggressive tumor that most metastasizes to regional lymph nodes and distant viscera; surgery with safe margins is the mainstay of treatment. Case Report: We report a case of 68-year-old woman who presented with an invasive clear cell hidradenocarcinoma situated in the left parotid area which recurred 5 months after surgery, this recurrence was managed successfully by high-dose irradiation of the tumor bed ( 66 Gy) and regional lymphatic chains (50 Gy), after a follow-up of more than 15 months, the patient is in good local control without significant toxicity. Conclusion : Post operative radiotherapy allows better local control and should be mandatory when histological features predictive of recurrence are present: positive margins, histology poorly differentiated, perineural invasion, vascular and lymphatic invasion, lymph node involvement, and extracapsular spread.
Keywords: Hidradenocarcinoma, sweat-gland, rare, surgery, recurrence, megavoltage external beam radiotherapy.
|How to cite this article:|
Lalya I, Hadadi K, Tazi E, Lalya I, Bazine A, Andaloussy K, Elmarjany M, Sifat H, Hassouni K, Kebdani T, Mansouri H, Benjaafar N, Elgueddari BK. Radiotherapy on hidradenocarcinoma. North Am J Med Sci 2011;3:43-5
|How to cite this URL:|
Lalya I, Hadadi K, Tazi E, Lalya I, Bazine A, Andaloussy K, Elmarjany M, Sifat H, Hassouni K, Kebdani T, Mansouri H, Benjaafar N, Elgueddari BK. Radiotherapy on hidradenocarcinoma. North Am J Med Sci [serial online] 2011 [cited 2019 Nov 18];3:43-5. Available from: http://www.najms.org/text.asp?2011/3/1/43/86399
| Introduction|| |
Hidradenocarcinoma (HDC) is a rare malignancy which arises from sweat glands, and it occurs conventionally de novo and rarely results in degeneration of a pre-existing hidradenoma  , and wide surgery is the mainstay of treatment. The estimated recurrence rate is 50% despite aggressive surgical treatment  , this justifies the use of an adjuvant treatment, based on external beam radiotherapy.
| Case Report|| |
A 68 year-old-woman presented with a lump in the parotid area measuring 1,5 cm in size, which progressed slowly over the next 2 years before treatment. Surgical excision was performed, pathologically this was a malignant clear cell hidradenocarcinoma with positive surgical margins, and re-excision of tumor bed was performed without leaving residual tumor.
Lesion recurred five months later, CT scan showed a tumor of parotid area measuring 3.6 cm and infiltrating overlying skin [Figure 1]. Subtotal parotidectomy has been realized 4 months later, surgical margins were positive with great residual tumor measuring 7cm, associated with ipsilateral fixed adenopathy measuring over 6 cm in size.
External beam radiotherapy has been realized, with opposed pair of large lateral opposing faciocervical fields that cover primary tumor bed, ipsilateral adenopathy and the upper neck lymphatics in one volume, at a total dose of 66 Gy, 2 Gy per fraction , 5 fractions a week , 33 fractions [Figure 2]. Lower neck lymphatics received prophylactic dose of 50 Gy, with an anteroposterior ipsilateral supraclavicular matched field. After a follow-up of more than 15 months the patient is in good local control without significant toxicity [Figure 3].
|Figure 2: Digitally reconstructed radiography of the left lateral field.|
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Morbidity was minimal, and the cosmetic result is excellent.
| Discussion|| |
HDC has been described for the first time by Keasby and Hadley in 1954  , even today fifty cases have been reported in the literature  . It is a rare tumor reported most frequently on the head and neck and rarely on the distal extremities; the mean age of onset is 50 years, with a slight female predominance  .
HDC can derive from preexisting clear cell hidradenomas but more commonly appear de novo, with the molecular events responsible for the pathogenesis currently unknown  . HDC usually present as a nodule, painless, firm or cystic, sometimes leaving a liquid which is serous or hemorrhagic. This nodule is usually single, and slowly growing  . The diagnosis is based on histopathological examination after biopsy or surgery, showing sweat intradermal proliferation inside a dense hyalinized stroma with nuclear pleomorphism and figures of mitosis , , necrosis is common  .
Surgery is the cornerstone of treatment, consisting of wide excision ensuring negativity of margins ,, , the role of lymph node dissection is only discussed in the literature with anecdotal report. In the absence of known distant metastases, clinically involved nodal regions should be dissected and irradiated, while clinically uninvolved primary nodal drainage areas should be either dissected or irradiated ,, . The role of a selective neck dissection is still debated and there is no clear evidence to its usefulness  .
Certain histopathology criteria should encourage consideration of postexcisional radiotherapy, the features, such as dermal lymphatic invasion, nerve-sheath involvement, deep structure infiltration, positive resection margins, highly anaplasic morphology, and extracapsular lymph node extension, may identify a high risk of recurrence , . Harari and colleagues reported complete remissions after external beam radiotherapy for sweat gland tumors with positive margins after surgery  , the dose and technique of radiotherapy are not consensual. In the work of Harari et al, primary surgical beds were treated with 70 Gy, using a combination of photons and electrons, and regional lymphatic chains with 50 Gy. Hyperfractionation schemes were used in two patients to minimize late normal tissue effects  .
There are both acute and long-term sequelae of radiation therapy for head and neck cancer that occur because of effects on normal tissues. Complications vary according to primary site and are dose dependent. Some common adverse effects include mucositis, xerostomia, trismus, hearing loss, and facial nerve dysfunction. Severe late complications include the risk of soft tissue necrosis, osteoradionecrosis, orocutaneous fistula, blindness, and second malignancies  . With the advent of new techniques of radiotherapy, such side effects are less frequent and better tolerated.
| Conclusion|| |
It seems obvious that the natural history of this aggressive tumor characterized by local recurrences mandates the use of radiotherapy after surgery for better local control.
| Acknowledgements|| |
All authors declare that they have no competing interests.
| References|| |
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[Figure 1], [Figure 2], [Figure 3]
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