改良Mohs显微描记手术治疗Merkel细胞癌二例

【摘要】 Mohs显微描记手术是切除皮肤肿瘤的理想术式。本文2例Merkel细胞癌患者行改良Mohs显微描记手术切除肿瘤，随访1年余，肿瘤未复发。与传统扩大切除术相比，改良Mohs手术是Merkel 细胞癌患者更好的选择。     

Microcystic adnexal carcinoma: forty-eight cases, their treatment, and their outcome

BACKGROUND: Microcystic adnexal carcinoma, or sclerosing sweat duct carcinoma, is an uncommon cutaneous neoplasm associated with extensive local invasion. The standard of care with regard to the best excisional method in treating microcystic adnexal carcinoma has not been established. OBJECTIVES: To perform a retrospective study comparing patients treated by Mohs micrographic surgery with those treated by wide excision and to elucidate the epidemiological features of microcystic adnexal carcinoma. PATIENTS AND METHODS: A retrospective analysis of a case series involving 48 primary and referral patients diagnosed as having microcystic adnexal carcinoma using standardized criteria. All cases were reviewed by the same dermatopathologists. RESULTS: Microcystic adnexal carcinoma predominantly affects the left side of the face of middle-aged women. Microcystic adnexal carcinoma is misdiagnosed 30% of the time. The recurrence rate is 1.98% per patient-year. Mohs micrographic surgery and simple excision show comparable complication rates. Clear margins were obtained in fewer procedures and, therefore, fewer office visits when the lesions were treated with micrographic surgery. The defect surface area after full extirpation following Mohs micrographic surgery was a mean of 4 times that of the clinically apparent size. The wide range of difference between the pre- and the post-Mohs micrographic surgery surface area noted in our data indicates that a margin cannot be safely predicted. CONCLUSIONS: Microcystic adnexal carcinoma is a predominantly left-sided, locally aggressive facial tumor, which results in significant morbidity. Our data do not support the use of standardized predictable margins. Mohs micrographic surgery is a reasonable initial treatment, as it accomplishes cure in fewer office visits and does not rely on predicted margins.     

Mucoepidermoid carcinoma (adenosquamous carcinoma) treated with Mohs micrographic surgery

BACKGROUND: Mucoepidermoid carcinoma (MEC), sometimes referred to as adenosquamous carcinoma (ASC), is a common malignant tumor of the salivary glands that can also develop from the esophagus, lacrimal passages, lung, upper respiratory tract, pancreas, prostate and thyroid. Rarely, MEC will present primarily in the skin. CASE: We present a case of primary MEC of the lower eyelid treated successfully with Mohs micrographic surgery. RESULTS: Mohs micrographic surgery was performed because of the highly aggressive and unpredictable nature of this tumor. The tumor was completely excised using Mohs with negative margins achieved in three stages. The patient has been disease free for 3 years since the surgery. CONCLUSION: We offer Mohs as an option for treating MEC.     

Mohs显微外科手术75例回顾分析

目的 分析Mohs显微外科手术的意义及特点.方法 对75例Mohs显微外科手术病例进行回顾性分析.结果 手术病例中多为老年人,基底细胞癌、Bowen病等为最常见的受治病种.部分肿瘤经多次扩大切除才被切净,最终切除面积大于常规方法切除的面积.68%为头面部手术,头面部缺损多需要应用复杂成形修复.手术缺损最终大小与患者年龄及皮肤肿瘤发生部位无关.结论 对于切除皮肤肿瘤,Mohs显微外科手术比常规切除方法更彻底,有助于切除后手术缺损的成形修复.     

Treatment of Cutaneous Melanoma of the Face by Mohs Micrographic Surgery

Background: The treatment of cutaneous malignant melanoma of the face presents a challenge to ensure eradication of disease with maximum preservation of tissue. Mohs micrographic surgery provides a means for histologically controlled removal of malignant melanoma. Objective: This study evaluates the efficacy of Mohs micrographic surgery, at a single institution, for the treatment of facial melanoma and assesses the accuracy of margin control by frozen section techniques. Methods: Ninety-seven patients with biopsy-confirmed melanoma in situ or invasive melanoma of the face were treated by Mohs micrographic surgery over a 6-year period. In 25 patients, tissue margins defined as negative for melanoma at the time of frozen section were re-evaluated on permanent section histology of formalin-fixed, paraffin-embedded tissue. Results: Ninety-two of 97 patients had followup information available (8–72 months; mean 33 months). There were no cases of local recurrence. Eighty-nine of the 92 patients were alive and well with no evidence of disease. One patient died of metastatic melanoma. In situ or invasive melanoma was not identified on permanent sections of 117 tissue margins which had been interpreted as negative on frozen section. Conclusion: Mohs micrographic surgery appears to be an effective treatment for facial melanomas. Our study showed complete correlation between frozen section tissue margins and permanent section controls.     

Mohs micrographic surgery: a review of indications,technique, outcomes,and considerations

Mohs micrographic surgery is a specialized form of skin cancer surgery that has the highest cure rates for several cutaneous malignancies. Certain skin cancers can have small extensions or “roots” that may be missed if an excised tumor is serially cross-sectioned in a “bread-loaf” fashion, commonly performed on excision specimens. The method of Mohs micrographic surgery is unique in that the dermatologist (Mohs surgeon) acts as both surgeon and pathologist, from the preoperative considerations until the reconstruction. Since Dr. Mohs’s initial work in the 1930s, the practice of Mohs micrographic surgery has become increasingly widespread among the dermatologic surgery community worldwide and is considered the treatment of choice for many common and uncommon cutaneous neoplasms. Mohs micrographic surgery spares the maximal amount of normal tissue and is a safe procedure with very few complications, most of them managed by Mohs surgeons in their offices. Mohs micrographic surgery is the standard of care for high risks basal cell carcinomas and cutaneous squamous cell carcinoma and is commonly and increasingly used for melanoma and other rare tumors with superior cure rates. This review better familiarizes the dermatologists with the technique, explains the difference between Mohs micrographic surgery and wide local excision, and discusses its main indications.     

Mohs micrographic surgery for thin stage I malignant melanoma: rationale for a modern management strategy.

Mohs micrographic surgery is presented as a rational surgical management approach for thin malignant melanoma. Advantages of the Mohs micrographic surgery fresh-tissue technique include tissue conservation, low local recurrence rates, and outpatient reconstruction. It is likely that in the future many physicians and patients will choose Mohs micrographic surgery for the surgical treatment of thin malignant melanoma.     

Reflectance confocal microscopy as a tool for screening surgical margins of basal cell carcinoma

Surgical excision of basal cell carcinoma with minimum margins requires serial assessment of layers by frozen histopathology in the case of Mohs micrographic surgery. Evaluation of presurgical tumor margins by in vivo reflectance confocal microscopy is a potential alternative. We selected 12 basal cell carcinoma lesions that were analyzed by confocal microscopy to define margins. The lesions were excised by Mohs surgery. Six tumors showed negative margins in the first phase of Mohs micrographic surgery. We concluded that reflectance confocal microscopy can be useful in the preoperative definition of basal cell carcinoma margins.     

Trichilemmomal horn: cutaneous horn overlying trichilemmoma

Four patients had keratotic, horn-shaped growths on the face or scalp. Histologically, each showed massive, largely orthokeratotic horn with a trichilemmoma at the base. Trichilemmomal horn (cutaneous horn overlying trichilemmoma) must be differentiated from trichilemmal horn, a cutaneous horn that shows trichilemmal rather than epidermoid keratinization.     

Mohs micrographic surgery in rare cutaneous tumors: a retrospective study at a Brazilian tertiary university hospital

BackgroundMohs micrographic surgery is an established technique in the treatment of cutaneous neoplasms. It offers higher cure rates and the main indications are non-melanoma malignant skin tumors. Few studies have been performed on the treatment of rare tumors through this technique.ObjectiveTo study rare skin tumors and rare variants of basal cell carcinoma and squamous cell carcinoma submitted to Mohs micrographic surgery in a tertiary service in relation to frequency, disease-free evolution, and applicability of this surgical procedure for this group of tumors.MethodsThis was a retrospective observational study including rare skin tumors and less common variants of basal cell carcinoma and squamous cell carcinoma treated using Mohs micrographic surgery, between October 2008 and April 2021.ResultsDuring the study period, 437 tumors were treated using Mohs micrographic surgery, and 22 (5%) rare skin tumors were selected. The tumors comprised three dermatofibrosarcomas protuberans, two atypical fibroxanthomas, two spiradenomas, two hypercellular fibrohistiocytomas, one primary cutaneous adenocarcinoma, one trichoblastoma, one porocarcinoma, one chondroid syringoma, one cutaneous angiosarcoma, one Merkel cell carcinoma, and one sebaceous carcinoma. Six other cases of rare basal cell carcinoma variants with trichoepitheliomatous differentiation, metatypical basal cell carcinoma, and clear cell squamous cell carcinoma were included. There were no cases of recurrence after an average of six years of follow-up.Study limitationsThis is a retrospective study on rare neoplasms carried out in a single referral center, and this surgical technique isn’t widely available in the public service.ConclusionThis retrospective case series showed that Mohs micrographic surgery is an appropriate treatment for rare skin tumors. They corresponded to 5% of the tumors treated by the technique during a 12-year-period, with no recurrences identified.     

Carcinoma anexial microquístico: la cirugía micrográfica de Mohs como tratamiento de elección

Introduction and objectivesMicrocystic adnexal carcinoma is a rare and aggressive tumor that manifests clinically as a subcutaneous nodule located on the head or neck. The tumor can be confused clinically and histologically with other benign and malignant skin lesions, often leading to inappropriate initial treatment. The chief concern with microcystic adnexal carcinoma is the elevated morbidity and the high rate of recurrence after wide local excision. Recent preliminary studies point to higher cure rates with Mohs micrographic surgery.Material and methodsWe reviewed the medical histories of 6 consecutive patients with microcystic adnexal carcinoma who underwent Mohs micrographic surgery in our dermatology department between 1995 and 2007.ResultsIn all cases, lesions were located on the head and were primary tumors. Seventy percent of the tumors were wrongly diagnosed initially as basal cell carcinoma. Perineural invasion was not detected in any patient, and all were free of recurrence after between 1 and 12 years of postoperative follow-up.ConclusionsThe absence of perineural involvement and substantial cell atypia can be attributed to the lesions being primary tumors. This would provide a rationale for definitive radical treatment of the primary tumor from the outset to avoid the complications associated with recurrence. The site and the absence of recurrence in all our patients who underwent Mohs micrographic surgery support the use of this technique as the treatment of choice in microcystic adnexal carcinoma.     

Frederic E. Mohs,MD, and the history of zinc chloride

The history of zinc chloride therapy before and including Frederic E. Mohs’ (1910-2002) early contributions to dermatologic oncology is presented. In 1932, Mohs devised a method of cutaneous surgery that employed zinc-chloride paste to devitalize basal or squamous cell carcinoma. Because zinc chloride coagulates malignant tissue without destroying cellular architecture, he described the surgery and its preservative effect as the fixed-tissue method. This method involved the serial removal of devitalized malignant tissue and the freezing and histologic examination of each layer; the process was continued until a cancer-free plane was reached. In 1953, a modified version of the micrographic system, the fresh-tissue method, was introduced. For improved efficiency, Mohs retained the systematic mapping of a neoplasm but eliminated the chemical escharotic. Although the fresh-tissue method has become the preferred treatment mode, zinc-chloride paste therapy remains in use today. Although the history of Mohs micrographic surgery is well documented, its background has not received sufficient attention. This paper surveys the chemical synthesis of zinc chloride, the formulation of zinc-chloride paste as a cutaneous escharotic, and the extent to which Mohs’ method compares with those of 19th and early 20th century predecessors.     

Mohs micrographic surgery for cutaneous malignancies: A focus review of its indications in pediatric age groups

Mohs micrographic surgery (MMS) is a highly specialized technique that has been successful in the treatment of a variety of skin tumors. The technique can be performed as an outpatient procedure and encompasses surgical excision and intraoperative assessment of tumor margins in one setting by the same physician. The process ensures precise margin control with maximal preservation of healthy tissues. Mohs micrographic surgery has been practiced worldwide, including in the United States, Europe (United Kingdom, Germany, Spain, Netherlands, Switzerland), and Australia. Although it is commonly performed in adults with greater success, it has been discussed less frequently in children. In this article, we describe several cutaneous tumors in children and the role of Mohs micrographic surgery in their management. A PubMed search was conducted to review the most common cutaneous tumors in children treated using Mohs micrographic surgery. In this review, we discuss indications for Mohs micrographic surgery and pertinent studies examining success rates in children. Mohs micrographic surgery has been used to treat several tumors in children and offers the advantage of high cure rates and tissue conservation. This report emphasizes the benefits of Mohs micrographic surgery in children and highlights several cutaneous tumors for which it has been used to treat successfully.     

Metastatic basal cell carcinoma: a case report and literature review. How accurate is our incidence data?

A 55-year-old man presented to Skin Cancer Surgery Center of Sacramento in 1995 for Mohs micrographic surgery of a 1.5-cm nodular basal cell carcinoma located on the right superior antihelix and scaphoid fossa. The tumor was excised by Mohs micrographic surgery. A recurrent basal cell carcinoma developed at the same site 5 years later and was treated also by Mohs micrographic surgery. One year later (approximately 6 years after the diagnosis of the initial basal cell carcinoma), a right parotid mass was noted on routine physical exam. CT scan and fine needle aspiration of the mass revealed metastatic basal cell carcinoma. The patient underwent excision of the parotid mass followed by radiation therapy. He has done well for the past 2 years since the diagnosis of his metastatic lesion. Basal cell carcinoma is the most common malignancy in the world. The metastatic potential of this tumor has been a cause for concern to many of our patients. We report a case of basal cell carcinoma metastatic to the parotid gland and critically review the incidence data reported in the literature. We recommended the collection of more current and accurate incidence data for basal cell carcinoma and metastatic basal cell carcinoma.     

Combined sentinel lymphadenectomy and mohs micrographic surgery for high-risk cutaneous squamous cell carcinoma

BACKGROUND: There are subgroups of cutaneous squamous cell carcinoma (SCC) that have a higher risk for both regional and distant metastasis. When cutaneous SCC does metastasize, it typically spreads first to local nodal groups. Sentinel lymph node (SLN) localization has been successfully used to evaluate nodal metastasis in breast carcinoma, melanoma, and other select tumors. It may also be useful in certain high-risk cutaneous SCCs. Currently, Mohs micrographic surgery is the treatment of choice for these tumors. METHODS: A patient presented with a high-risk recurrent SCC on the forehead. The regional nodal groups were clinically negative and radiographically negative by computed tomographic scan. Sentinel lymphadenectomy was performed by means of technetium 99m-radiolabeled sulfur colloid. The main tumor was resected with Mohs micrographic surgery. RESULTS: A left preauricular SLN was localized by lymphoscintigraphy. The SLN was located intraoperatively by means of a gamma probe and excised. Subsequent pathologic evaluation of the SLN was negative for evidence of metastatic SCC by light microscopy with hematoxylin and eosin, and with immunohistochemical stains for cytokeratins AE1 and AE3. The day after SLN excision, the tumor was removed via Mohs micrographic surgery with clear surgical margins after a total of 8 stages. Aggressive subclinical spread by both subcutaneous "skating" and perineural invasion was noted. CONCLUSION: The combination of Mohs micrographic surgery and sentinel lymphadenectomy is feasible and has theoretical utility in the management of a subset of cutaneous SCCs at high risk for metastasis. The ability of sentinel lymphadenectomy to identify regionally metastatic cutaneous SCC as well as the additive benefit of SLN and Mohs micrographic extirpation in the treatment of high-risk cutaneous SCC remain to be further clarified.     

Management of unusual cutaneous malignancies: atypical fibroxanthoma, malignant fibrous histiocytoma, sebaceous carcinoma, extramammary Paget disease

Atypical fibroxanthoma, malignant fibrous histiocytoma, sebaceous carcinoma, and extramammary Paget disease are rare cutaneous tumors. Their recognition and diagnosis are critical in decreasing long-term morbidity and mortality. Surgical excision is the treatment of choice for these tumors, and Mohs micrographic surgery has been shown to be as favorable or better than wide local excision in providing long-term clearance rates.     

Microcystic adnexal carcinoma: First reported case in an African American man.

Microcystic adnexal carcinoma (MAC) is a relatively uncommon adnexal neoplasm that can display aggressive local invasion. MAC occurs most commonly on the central part of the face and can be clinically asymptomatic with a benign appearance. We describe the first reported case of MAC in an African American man who was treated by Mohs micrographic surgery.     

Residual skin cancer after preoperative biopsy: evaluation by Mohs micrographic surgery

BACKGROUND: Some patients are referred for Mohs surgery with no or minimal clinical evidence of skin cancer at the biopsy site. OBJECTIVE: To determine the incidence of residual skin cancer at biopsy sites during Mohs micrographic surgery. METHODS: We evaluated all patients that underwent Mohs surgery for basal cell and squamous cell carcinomata in one year. The study was carried out prospectively. Debulking was done using a no. 15 blade at the clinical borders of the tumor or biopsy site. All specimens were sectioned at the middle and cut to the periphery at 20- microm intervals. RESULTS: Seven hundred and forty-one patients underwent operations. In 390 patients, a biopsy was performed prior to surgery. A total of 351 patients were biopsied as prestaged (chemocheck) during surgery. Ninety-nine (25%) of the preoperatively biopsied patients showed no residual tumor in the debulking specimen or the first layer. Of these 99 patients, 84 had basal cell carcinoma and 15 had superficial or in situ squamous carcinoma. CONCLUSIONS: In this study, preoperative biopsy for diagnosis of skin cancer of the face was curative in 25% of patients, despite pathologic diagnosis of incompletely excised tumor. However, as the majority of preoperatively biopsied patients showed residual tumor, Mohs micrographic surgery is indicated in all patients with incomplete removal of skin cancer of the head and neck.     

Histological evaluation of residual basal cell carcinoma after shave biopsy prior to Mohs micrographic surgery

Background Patients who are referred for Mohs surgery after pre‐operative biopsy has been performed show in some cases no clinical or pathological evidence of tumour persistence. We have previously shown that 25% of these patients show no residual skin cancer either basal cell carcinoma or squamous cell carcinoma. The reasons for ‘disappearance’ of the tumour may be true non‐persistence or false non‐persistence because of wrong‐site Mohs surgery. Objective To determine the incidence of residual basal cell carcinoma after shave biopsy of primary nodular basal cell carcinoma prior to Mohs micrographic surgery. Methods A prospective unblinded study was performed on patients undergoing Mohs surgery for primary nodular basal cell carcinoma. The tumour was removed as a shaved excision using a No. 15 blade at the clinical borders like a shave biopsy (Mohs shave). The bases of the tumors were excised and then sectioned vertically at the middle and cut to the periphery at 10–15 μm intervals till the edge. Results Fifty‐one patients were evaluated. In 40 patients, residual basal cell carcinoma was found at the base of the shave excision site (78.4%). Conclusions Pre‐operative shave biopsy performed during Mohs surgery for primary nodular basal cell carcinoma is ‘curative’ in 22% of the patients.     

Surgical Tip: The Double-Bladed Scalpel in Mohs Micrographic Surgery

Mohs micrographic surgery is applied as the primary method of treatment for various cutaneous neoplasms. Many other methods that are modified applications of Mohs micrographic surgery have also been suggested. We introduce a technique, which is a modified vertical method of Mohs micrographic surgery using the double-bladed scalpel.