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1.47: Surgical Management of Skin Cancers of the Head and Neck

  • Page ID
    17689
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    OPEN ACCESS ATLAS OF OTOLARYNGOLOGY, HEAD & NECK OPERATIVE SURGERY

    SURGICAL MANAGEMENT OF SKIN CANCERS OF THE HEAD AND NECK

    André Bandiera de Oliveira Santos, Claudio Roberto Cernea


    Skin cancer is the most common cancer among Caucasians. The most common histological types are basal cell carcinoma (BCC), squamous cell carcinoma (SCC) and melanoma. Head and Neck Surgery (HNS) has its role in the treatment of advanced cases of the most frequent types and in the treatment of rare tumors.1

    BCC

    The incidence of BCC is the highest of all malignant tumors. However, it is difficult to quantify, as notification is not mandatory in most countries. It is estimated to have an incidence between 500 and 1000 cases / 100,000 inhabitants, i.e. at least 100 times higher than the incidence of oral cancer in the United States.2

    There are several treatment modalities with cure rates of the order of 95%. Eighty percent of BCCs are of the head and neck. Curettage, cryotherapy, electrocoagulation, photodynamic therapy and topical chemotherapy can be performed with high success rates, especially in early cases. The most commonly used treatment is conventional surgical excision.3

    The small number of cases referred for surgery are advanced, sometimes due to the patient's neglect of the tumor, difficulty in accessing specialised care, and failure of previous treatments. The most common site is the nose, and there are reports of younger mean age for patients treated by head and neck surgery specialists, when compared to those treated by dermatologists.1,4

    There are at least 8 histological subtypes of BCC: nodular, superficial, morpheaform (sclerodermiform), metatypical, micronodular, sclerosing, pigmented, and adenoid.

    The occurrence of more than one subtype in a single tumor is common. The nodular and superficial subtypes are the most prevalent and the least aggressive, with a lower probability of relapse. The subtypes micronodular, metatypical and morpheaform present more aggressive characteristics and are more likely to relapse.5

    Clinically, nodular BCC presents as an elevated, nodular lesion, with well-defined borders, a reddish-brown, pearly, shiny color and with teleangiectases on the borders, sometimes ulcerated. The superficial BCC has the same characteristics without the appearance of a nodule. Much less characteristic, the morpheaform sub-type presents as a reddish, brown or even whitish plaque, resembling sclerodermia, with a poorly defined border. This characteristic is due to the presence of collagenase at the extremities of the tumors which may present with finger-like extensions, sometimes called pseudopods.4 In these cases, the margins of surgical resection are uncertain and should be confirmed by frozen section examination until complete resection of the lesion. Most of the time the diagnosis is made only after biopsy and the professional can only then plan the surgery.6

    In cases of locally advanced tumors, there is a need for histopathological confirmation with incisional biopsy by an experienced pathologist, to determine a diagnosis and permit the correct therapeutic planning. The clinical characteristics described above do not always apply to large lesions, since there is often significant tissue destruction and loss of tissue differentiation.7

    For surgical planning, computed tomography with contrast should be performed in 2 cases where there is suspicion of invasion of deep planes, especially bony, cartilaginous and parotid. In cases of suspected invasion of the skull base, MRI should be requested.8

    The location of a BCC is important because of the likelihood of recurrence. High risk areas are nose, eyelids, periorbita, periorally, chin, mandibular, preauricular, postauricular, ear and temporal. Factors such as immunosuppression and previous radiotherapy also increase the chance of relapse, as well as the occurrence of scleroderma, metatypic or micronodular subtypes at any point of the tumor.9

    Almost all of the tumors treated by head and surgeons can be classified into the high-risk group. For these lesions, excision with circumferential and deep free margins confirmed by frozen section is recommended. A 1cm margin is desirable, but is not always possible, especially on the face. Elective neck dissection is not indicated. We observed an incidence of less than 1% of cervical metastases, which is therefore a rare occurrence.10

    Radiotherapy may be indicated in surgical cases with compromised margins where reoperation is not an option, major bone resections and invasion of the skull base. There is a good response of BCC to radiotherapy in the rare cases where surgery is not the treatment of choice.11

    Inhibitors of the Hedgehog pathway (HH), such as Vismodegib, are oral chemotherapy options for advanced and irresectable cases. Well-tolerated, the medication presents objective results in selected cases, at a high cost.12

    SCC

    SCC is derived from the spinous layer of the epidermis and accounts for 20% of malignant skin tumors. It has a metastatic potential of around 10%. The precusor lesion is actinic keratosis. One of the lesions that presents a difficult differential diagnosis is the keratoacanthoma, a benign lesion with fast growth.2

    Clinically, cutaneous squamous cell carcinoma may appear as a plaque or a papule. Bowen's disease and Queyrat's erythroplasia are different forms of SCC in situ. The invasive form is firm and often ulcerated. Although most cases referred to the head and neck surgeon already has been diagnosed by biopsy, it is preferable that the biopsy be reviewed or repeated in doubtful cases.

    Risk factors for recurrence in SCC are:

    • Location in zone "H"
    • Immunosuppression
    • Previous radiotherapy
    • Recurrence in an operated site
    • Poorly defined borders
    • Rapid growth
    • Neurological symptoms
    • Little or moderately differentiated
    • Acantholytic, adenosquamous, metaplastic or desmoplastic subtypes
    • Invasion level corresponding to Clark IV or V or Breslow> 4 mm
    • Vascular or perineural invasion

    Classically, elective neck dissection is not indicated for cutaneous SCC. The search for sentinel lymph nodes in high-risk SCC is not routine and its benefit is questionable. With cervical metastases, neck dissection should be comprehensive; and with parotid metastasis, at least a supraomohyoid neck dissection should be done, in addition to parotidectomy.13

    Radiotherapy can be used as primary treatment in nonsurgical cases. As adjuvant treatment, it is beneficial in cases of cervical metastasis revealed by neck dissection or parotidectomy, especially if there is extracapsular extension. Other indications are involved margins and perineural invasion.11

    TNM Staging for Nonmelanoma Skin Cancer (2017)

    T1

    T2

    T3

    T4

    < 2 cm

    > 2 cm e <4 cm

    ≥4 cm, deep invasion (> 6mm or beyond subcutaneous), bone erosion or perineural invasion

    T4a: Gross invasion of cortical bone or marrow

    T4b: Invasion of the base of the skull or foramina of the base of the skull

    N1

    N2a

    N2b

    N2c

    N3

    ipsilateral lymph node <3 cm, without extracapsular extension

    ipsilateral lymph node between 3 and 6 cm, without extracapsular extension

    more than 1 lymph node, ipsilateral, <6 cm, without extracapsular extension

    Contralateral or bilateral lymph node(s) <6cm, without extracapsular extension

    N3a: lymph node ≥ 6 cm, without extracapsular extension

    N3b: lymph node (s) with extracapsular extension

    Surgical treatment of BCC and SCC

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    Figure 1 a-e: Recurrent BCC of glabella with invasion of glabella, orbit and skull base

    Resection of high-risk head and neck tumors should be planned with 10 mm circumferential and deep free margins. Often the planning of this type of resection involves exenteration of the orbit, resection of bone, by a multimultidisciplinary team to permit large surgical approaches (Figure 1).

    Resulting deformity requires a commonsense approach by the surgeon and a frank discussion with the patient.14 Curative treatment is not always the best option and palliative alternatives should be considered.

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    Figure 2 a-c: Patient with SCC of eyelid with orbital and skull base invasion, reconstructed with anterolateral thigh flap

    With surgical planning, involvement of the surgical teams from other specialties such as plastic surgery, neurosurgery and otorhinolaryngology is required to optimize surgical outcome and functional rehabilitation (Figure 2).

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    Figure 3 a-c: Retroauricular SCC reconstructed with a trapezius flap

    With the patient anesthetised, the borders of the tumor including the peripheral rim of erythema should be carefully marked. The margin should be drawn with a surgical pen or other marker before infiltration of local anesthetic. Drawing the specimen and the defect for the pathologist is desirable and assists in describing the margins (Figure 3). Infiltration with vasoconstricttor-containing solution can be employed as it reduces the need for electrocoagulation of the margins, contributing to better histopathological analysis. To remove the tumor, a double-bladed scalpel (1 mm distance between the blades)15 may be used, which can be made by attaching a second blade with sterile adhesive tape.

    This technique allows the removal of margins of skin that can be immediately taken to the pathologist, even prior to removal of the tumor. After removal of the lesion, the deep margin should be assessed, if possible, also with frozen section.

    Melanoma

    Melanocytes are cells originating from the neural crest that occupy the epidermis in its basal layer. In part because of their distinct embryological origin, melanomas have very pronounced metastatic potential.

    Although it accounts for 4% of skin tumors, melanoma is the most lethal skin tumor. Its prognosis is related to tumor thickness from the granulosa layer to the deepest part of the primary lesion (Breslow index). The higher the Breslow index in millimeters, the greater the chance of lymphatic and distant metastases, especially above 1 mm.16

    Clinically, any melanocytic lesion that changes its growth characteristics, changes color or has pruritus should be suspected.

    The ABCDE rule exemplifies such characteristics - Asymmetry, irregular Borders, multiple Colors, Diameter >6 mm and Evolution. The diagnosis of melanoma is made with a biopsy, preferably excisional, or incisional in cases where the resulting defect is unacceptable.

    Most of the time the head and neck surgeon receives the diagnosis of melanoma following a prior biopsy. The treatment to be followed depends fundamentally on the Breslow index.17 It is necessary to resect a margin of macroscopic normal skin around the biopsy scar, according to Breslow index below:

    Wide excision is the main treatment in patients without metastases. Treatment of the lymphatics depends on sentinel lymph node screening.

    Sentinel lymph node biopsy is indicated in all patients with melanoma with a Breslow index above 1 mm without detectable metastases. Cases with Breslow between 0.75 mm and 1 mm should indicate if there is ulceration or a mitotic index other than zero.

    On the day prior to surgery, the patient should have lymphoscintigraphy with technetium. The technetium is injected around the scar and the image obtained locates the first lymph node that drains the region. The nuclear physician then marks the patient's skin overlying the lymph node confirmed by the probe (probe attached to the measuring device). After anesthesia, the patent blue dye is injected (patent blue dye is permeable to lymphatic vessels, unlike methylene blue and other dyes). The recommended volume is 1mL, preferably in insulin syringe, but it is not always possible to inject all the contents, and there is the risk of permanently "tattooing" the skin in regions such as the face. For best results, the injection should be performed intradermally - below this level the drainage is impaired. Leaks from the syringe should be carefully avoided to avoid compromising the procedure.

    Close proximity of the lymph node and the primary lesion (rarely with lesions outside the head and neck) may impair the investigation when using the probe. In some cases, margin resection may be necessary prior to sentinel lymph node biopsy. Intraoperative frozen section examination of sentinel lymph nodes is not currently recommended, since it may impair the study of the whole lymph node with hematoxylin-eosin and immunohistochemical study (HMB 45, melan A and protein S100), which is best performed in a block of paraffin.

    Classically, the finding of a positive cervical sentinel lymph node is an indication for neck dissection of all 5 levels of the neck. Recently, in a prospective, randomised study, survival proved to be equal between serial ultrasound observation and elective neck dissection in cases with positive sentinel nodes,18 and continues to be a subject of debate today.17

    With parotid lymph nodes, parotidectomy and supraomohyoid neck dissection should be performed. Much controversy exists about what to do in relation to the facial nerve with intraparotid sentinel lymph nodes - due to the need for reoperation if the node is positive. We perform superficial parotidectomy if nerve dissection is required, which has been shown to be rare - in most cases the lymph nodes are close to the parotid capsule and can be safely biopsied without nerve dissection.

    In cases of cervical macrometastases, neck dissection is performed according to the standard procedure for squamous cell carcinoma of mucosa of the head and neck. Preservation of structures not affected by metastases (modified radical cervical dissection) may be performed. Locoregional control is important in melanoma and the presence of distant metastases does not contraindicate neck dissection by itself. Selected cases also benefit from metastasectomy in extra-cervical sites. The behaviour of distant metastases may be aggressive but is not infrequently slow and indolent.17

    After neck dissection for macrometastases, complementary cervical radiotherapy is indicated. This approach is well accepted for extracapsular extension, but some studies have shown better control also for macrometastases.17

    Staging

    T Breslow (mm)  
    T1 ≤ 1.0 A: 0- 0.8mm without ulceration B: 0.8-1mm or <0.8 with ulceration

    T2

    T3

    T4

    1.01-2.0

    2.01-4.0

    > 4.0

    A – With ulceration

    B – Without ulceration

    Number of metastatic lymph nodes

      Number of metastatic lymph nodes Metastatic lymph node mass
    N1

    1 lymph node

    0 lymph node

    A: micrometastasis *

    B: macrometastasis†

    C: metastasis or in transit without metastatic lymph nodes

    N2

    2-3 lymph nodes

    1 lymph node

    A: micrometastasis*

    B: macrometastasis†

    C: metastasis or in transit without metastatic lymph nodes

    N3

    4 or more

    2 or more

    A: positive sentinel lymph nodes

    B: 4 or more, at least 1 clinically detectable or any number of coalescing lymph nodes

    C: two or more, with satellite metastasis or associated in transit

      Local DHL sérica
    M1a Skin distant, subcutaneous, or lymph node metastasis  
    M1b Pulmonary metastasis (0) DHL normal
    M1c All other visceral metastases (1) DHL elevated
    M1d Metastasis to Central Nervous System  

    * diagnosed after sentinel lymph node or elective lymphadenectomy

    † defined as metastatic lymph node clinically confirmed by therapeutic lymphadenectomy or when lymph node metastasis exhibits gross extracapsular extravasation

    Levels of histological invasion (Clark)

    I in situ. Entire lesion is intraepidermal
    II Beyond basement membrane. Occupies papillary dermis, does not reach the border between papillary and reticular
    III Occupies papillary dermis; reaches border between papillary dermis and reticular, without invading the reticular
    IV Includes reticular dermis
    V invades hypodermis

    Clinical stages of melanoma: UICC 2017

    Melanomas with Breslow > 4 mm present a >40% chance of distant metastasis. They are sometimes mistakenly thought to have such a bad outcome that it would not be worthy resecting an additional margin and treating the cervical nodes. Such a practice is unfortunately common and worsens the prognosis. Even in advanced cases, surgical treatment should always be considered, since local control is very important for treatment.

    Surgery according to tumor location

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    Figures 4 a-d: Patient of 4 years with congenital nevus reconstructed with bilobed flap

    The nose is the site of highest incidence of skin tumors on the face. Simple suturing is usually preferred when possible. Nasal tip defects smaller than 1 cm without cartilage invasion can be reconstructed with a bilobed flap from the nose itself (Figure 4).

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    Figure 5 a-b: Patient with melanoma of nasal tip, Breslow 1,3 mm, reconstructed with nasal flap

    One option is the nasal sliding flap, using part of the glabella (Figure 5). Small nasal wing defects can be reconstructed with a superior or inferior pedicled nasogenial flap.

    Small nasal dorsal defects can be reconstructed with a glabellar flap. With large resections of nasal skin without removal of cartilage, the frontal (or Indian) flap is a good option, requiring two surgical visits, the second time being scheduled three to four weeks later with transection of the pedicle. Removing nasal cartilage implies a greater complexity of reconstruction, which should include the nasal lining and possibly using auricular cartilage to replace a nasal wing.

    With total or near total rhinectomy, nasal reconstruction should be an exception, as keeping the defect open may be the best option, being careful not to keep the bone exposed (often it is necessary to remove part of the nasal bone) and posterior reconstruction with a prosthesis.

    With the scalp, the thickness of the primary lesion and its extension into the pericranium is important. If the pericranium can be preserved, skin grafting is a good option for most cases. However, when there is invasion and hence resection of pericranium, a scalp flap is needed to cover the exposed bone and a skin graft for the donor area.

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    6b.png

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    Figures 6 a-c: Patient with eyelid melanoma, Breslow 1 mm, reconstruction with Mustardé flap

    In the malar region several reconstruction options may be considered. The Mustardé flap is a good option, especially for defects near the lower eyelid (Figure 6). Large bilobed or rhomboid flaps can also be used, always taking care to avoid ectropion due to tension on the lower eyelid.

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    Figures 7 a,b: Resection of SCC of the upper lip, reconstructed with bilateral V-Y flaps

    Figure 7 is an example of lip reconstruction with V-Y flaps bilaterally. The frontal and temporal regions are regions where skin grafting lends itself well, with aesthetic and functional results superior to grafting on other parts of the face and neck. Still, flap coverage should be preferred whenever possible.

    A defect arising from orbital exenteration may be skin grafted directly or onto a temporalis muscle flap in order to better adapt the prosthesis.

    References

    1. Andrade N, Santos A, Lourenco S, esta Neto C, Cernea C, Brandao L. Epidemiological and histopathological profile of 642 cases of basal cell carcinoma of head and neck surgery in a tertiary institution Sao Paulo: Rev. Bras. Cir. Cab. Pesc.; 2011:148-53
    2. Madan V, Lear JT, Szeimies RM. Nonmelanoma skin cancer. Lancet 2010;375:673-85
    3. Zou Y, Zhao Y, Yu J, et al. Photodynamic therapy versus surgical excision to basal cell carcinoma: meta-analysis. J Cosmet Dermatol 2016;15:374-82
    4. Rubin AI, Chen EH, Ratner D. Current concepts - Basal-cell carcinoma. N Engl J Med 2005;353:2262-9
    5. Sexton M, Jones DB, Maloney ME. Histologic pattern analysis of basal cell carcinoma. Study of a series of 1039 consecutive neoplasms. J Am Acad Dermatol 1990;23:1118-26
    6. Cernea CR, Dias FL, Lima RA, et al. Atypical facial access: an unusually high prevalence of use among patients with skull base tumors treated at 2 centers. Arch Otolaryngol Head Neck Surg 2007;133:816-9
    7. Costantino D, Lowe L, Brown DL. Basosquamous carcinoma - an underrecognized, high-risk cutaneous neoplasm: case study and review of the literature. J Plast Reconstr Aesthet Surg 2006;59:424-8
    8. Williams LS, Mancuso AA, Mendenhall WM. Perineural spread of cutaneous squamous and basal cell carcinoma: CT and MR detection and its impact on patient management and prognosis. Int J Radiat Oncol Biol Phys 2001;49:1061-9
    9. Bastiaens MT, Hoefnagel JJ, Bruijn JA, Westendorp RG, Vermeer BJ, Bouwes Bavinck JN. Differences in age, site distribution, and sex between nodular and superficial basal cell carcinoma indicate different types of tumors. J Invest Dermatol 1998;110: 880-4
    10. Santos AB, Andrade NM, Brandão LG, Cernea CR. Which features of advanced head and neck basal cell carcinoma are associated with perineural invasion? Braz J Otorhinolaryngol 2017; 83:94-7
    11. Mendenhall WM, Ferlito A, Takes RP, et al. Cutaneous head and neck basal and squamous cell carcinomas with perineural invasion. Oral Oncol 2012;48:918-22
    12. Sekulic A, Migden MR, Basset-Seguin N, et al. Long-term safety and efficacy of vismodegib in patients with advanced basal cell carcinoma: final update of the pivotal ERIVANCE BCC study. BMC Cancer 2017;17:332
    13. O'Hara J, Ferlito A, Takes RP, et al. Cutaneous squamous cell carcinoma of the head and neck metastasizing to the parotid gland - a review of current recommendations. Head Neck 2011;33: 1789-95
    14. Cernea CR, Ferraz AR, de Castro IV, et al. Perineural Invasion in Aggressive Skin Carcinomas of the Head and Neck. Orl-J Oto-Rhino-Laryngology and Its Related Specialties 2009;71:21- 6
    15. Cernea CR, Velasco O, Gomes MQ, et al. Double-bladed scalpel: a new option for harvesting margins in head and neck cancers. ORL J Otorhinolaryngol Relat Spec 2006;68:83-7
    16. Balch CM, Gershenwald JE, Soong SJ, et al. Final version of 2009 AJCC melanoma staging and classification. J Clin Oncol 2009;27:6199-206
    17. Coit DG, Thompson JA, Algazi A, et al. Melanoma, Version 2.2016, NCCN Clinical Practice Guidelines in Oncology. J Natl Compr Canc Netw 2016;14: 450-73
    18. Faries MB, Thompson JF, Cochran AJ, et al. Completion Dissection or Observation for Sentinel-Node Metastasis in Melanoma. N Engl J Med 2017;376: 2211-22

    Authors

    André Bandiera de Oliveira Santos
    Head and Neck Surgeon,
    Faculty of Medicine
    University of São Paulo, Brazil
    andre_bandiera@yahoo.com.br

    Claudio Roberto Cernea
    Professor
    Faculty of Medicine
    University of São Paulo, Brazil
    cerneamd@uol.com.br

    Editor

    Johan Fagan MBChB, FCS(ORL), MMed
    Professor and Chairman
    Division of Otolaryngology
    University of Cape Town
    Cape Town, South Africa
    johannes.fagan@uct.ac.za