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Squamous cell carcinoma tumor thrombus encountered during Mohs micrographic surgery

Mon, 06/02/2014 - 3:05pm

We present a unique case of complete vascular occlusion by squamous cell carcinoma (SCC) encountered during Mohs micrographic surgery.

Verrucous carcinoma of the scalp

Mon, 06/02/2014 - 3:05pm

Verrucous carcinoma is a distinctive form of low-grade squamous cell carcinoma. It typically involves the oral cavity, larynx, esophagus, and skin. Cutaneous lesions typically arise in the genitocrural area and plantar surface of the foot, with rare case reports of verrucous carcinoma arising elsewhere on the body. Human papillomaviruses, predominately types 6 and 11, have been associated with some case reports. We present a case of verrucous carcinoma arising on the scalp with negative human papillomavirus testing in a relatively young patient.

Advancement flap for the reconstruction of nasal ala and lateral nasal tip defects

Mon, 06/02/2014 - 3:05pm

Repair of nasal ala and lateral nasal tip defects provide unique reconstructive challenges. This article describes a one-staged advancement flap for repair of such defects. The flap may be medially-based, laterally-based, or bilaterally-based. Sharp undermining is recommended, and a standing cone must be removed superior to the defect, perpendicular to the alar rim. Temporary alar rim flattening is accepted, and normalizes with time. This reconstruction has provided excellent functional and cosmetic results for defects measuring tip.

Pregnancy and dermatologic surgery

Mon, 06/02/2014 - 3:05pm

The physiologic changes of pregnancy and risks to the fetus require attention during dermatologic surgery. Elective surgery should be performed in the second trimester or the postpartum period. Cosmetic work should occur after delivery to avoid hypertrophic or hyperpigmented scars. Skin preparatory agents and anesthetics may have fetal implications and should be chosen with care. Antibiotic selection for any infections must take into account possible maternal and fetal risks. Attention to detail and awareness of the changes in pregnancy should lead to safe surgery in the pregnant patient.

Euro-what

Mon, 06/02/2014 - 3:05pm

Escharotic and other botanical agents for the treatment of skin cancer: a review

Mon, 06/02/2014 - 3:05pm

A growing era of alternative medicine is upon us. All who practice medicine have a small population of patients who eschew Western medicine and prefer alternative approaches, including botanical remedies, to treat their medical problems. Many alternative practitioners advertise and sell products on the Internet. Indeed, this trend now includes a growing number of topical treatments for skin cancer, including escharotic agents.

Self-treatment of skin cancer requires a substance that will destroy tissue, usually indiscriminately. Escharotic agents are caustic, corrosive substances that produce a thick coagulated crust (an eschar) and subsequently a scar.

The following case illustrates one representative situation.

Surgical pearl: The use of endarterectomy scissors in dermatologic surgery

Mon, 06/02/2014 - 3:05pm

Surgical scissors are a necessary component of the surgical tray. It is optimal to maintain one plane of cutting or dissection when excising a lesion or undermining tissue. This is particularly important when removing a melanoma, large lesion, or Mohs micrographic surgery layer. Traditionally iris, gradle, and Stevens tenotomy scissors have been the preferred instruments for cutaneous surgery in small shallow areas. These instruments accommodate more delicate anatomic areas well. Many dermatologic surgeons use Metzenbaum or Mayo scissors when undermining larger, deeper defects and cutting thicker, more resilient skin (such as that on the scalp, back, or extremities). These scissors have a longer shank and tips than the aforementioned instruments and are more efficient in cutting and manipulating deeper tissue and larger lesions. In certain situations, however, their long tips may feel clumsy and provide less precise cutting and undermining. When used to cut the subcutaneous tissue, these scissors tend to catch a nodule of fat deep in the defect instead of maintaining a level, even cutting surface through the fat.

The significance of tumor persistence after incomplete excision of basal cell carcinoma

Mon, 06/02/2014 - 3:05pm

BACKGROUND: Physicians inevitably receive a pathology report after excision of a basal cell carcinoma that indicates that it is incompletely excised. The physician and patient are then left with the dilemma of whether immediate re-excision or close clinical follow-up is indicated.

OBJECTIVE: Our purpose was to identify characteristics of incompletely excised basal cell carcinomas that are at low risk for recurrence.

METHODS: We retrospectively reviewed the charts and pathology slides of all incompletely excised basal cell carcinomas from 1991 to 1994 in a university hospital tumor registry.

RESULTS: Incompletely excised basal cell carcinomas of superficial or nodular subtype, less than 1 cm in diameter, located anywhere except the nose or ears, with less than 4% marginal involvement on the initial inadequate excision had no evidence of tumor persistence.

CONCLUSION: When physicians receive a pathology report indicating the incomplete excision of a basal cell carcinoma, they face the dilemma of further management. The majority of patients should undergo immediate re-excision or Mohs micrographic surgery because tumor persistence was found in 28% of cases. Occasionally, for a small group of select patients, close clinical follow-up may be indicated if the risk of recurrence is very low.

Basal cell carcinoma metastatic to the parotid: report of a new case and review of the literature

Mon, 06/02/2014 - 3:05pm

Basal cell carcinoma is the most common of the cutaneous malignancies, accounting for 65 to 75% of all skin cancers. The natural history of this disease is one of chronic local invasion. Metastatic basal cell carcinoma is a rare clinical entity, with a reported incidence of only 0.0028 to 0.5%. Approximately 85% of all metastatic basal cell carcinomas arise in the head and neck region. We present a case of basal cell carcinoma that spread to the parotid gland in a man who had multiple lesions on his scalp and face. We also review the literature on metastatic basal cell carcinoma of the head and neck, and we discuss its epidemiology, etiology, histopathology, and treatment.

The heterogenous nature of in vivo basal cell carcinoma

Mon, 06/02/2014 - 3:05pm

BACKGROUND: There have been nearly 70 different histologic subtypes of basal cell carcinoma (BCC) described. Some of the subtypes have been shown to have clinical relevance. The degree to which one type may merge to another, within the same tumor mass, has been poorly studied.

OBJECTIVE: To determine if BCCs maintain biopsy histology throughout the entire architecture of the tumor.

METHOD: Tumors were evaluated with a prospective histologic analysis of all primary BCCs using the Mohs "removal in layers" technique. All BCCs that required more than a single Mohs stage to clear were included in analysis.

RESULTS: One hundred forty-nine tumors were examined. Fourteen of these were of mixed histologic subtype on biopsy and were not included in the analysis. Six biopsy specimens were inadequate to make a subtype diagnosis and were excluded from calculation. Of the remaining 129 tumors 59% maintained their biopsy diagnosis at first Mohs stage, and 49% at the second Mohs stage. Infiltrative tumors were the most likely to maintain their histologic subtype classification. Of the tumors that showed nodular BCC on biopsy, 13% were infiltrative or micronodular at first Mohs stage.

CONCLUSION: While many BCCs demonstrate a single histological subtype, roughly 40% change in their microscopic appearance at the subclinical extension. This finding has the potential to alter therapy.

The immunohistochemical characteristics of the basosquamous cell carcinoma

Mon, 06/02/2014 - 3:05pm

BACKGROUND: The basosquamous cell carcinoma (BSCC) is a poorly defined and often misunderstood cutaneous malignancy.

OBJECTIVE: The purpose of this study was to compare, using immunohistochemical techniques, the BSCC, basal cell carcinoma (BCC), and squamous cell carcinoma (SCC).

METHODS: BSCC occurring at Pennsylvania State University over the past 10 years were identified. Choosing seven BCC, and nine SCC as controls, all specimens were stained for keratin, lack of apoptosis, glycoproteins, and altered gene products using the avidin/biotin and strep-avidin immunoperoxidase techniques. Each malignancy was then graded for the percentage of cells stained with each marker.

RESULTS: Of the markers studied, all stained to varying degrees the malignant aspects of the specimens. There were similar patterns between tumors, with the BSCC showing a transition zone between typical BCC and SCC. This was most striking for Ber-EP4, where over two-thirds of the BCC stained, none of the SCC, and half of the BSCC showed reactivity.

CONCLUSION: BSCC has staining patterns similar to both the BCC and SCC. The presence of a transition zone does not support the concept that all BSCC are collision tumors, but rather a differentiation of one tumor into another. We confirm earlier reports that Ber-EP4 could be used to distinguish between classic BCC and SCC. AE1/AE3, bcl-2, TGF-alpha, and p53 were not helpful in separating the tumors.

Cell surface molecules in basal cell carcinomas

Mon, 06/02/2014 - 3:05pm

BACKGROUND: The factors determining a basal cell carcinoma's (BCC's) growth pattern and invasive potential are not known. In other tumors it has been shown recently that the expression of cellular adhesion molecules may determine a tumor's invasive and metastatic potential. Integrins, cell surface molecules important in cell stroma interactions, are present on BCCs and may help regulate the tumor's growth pattern.

OBJECTIVE: We compared the expression of cellular adhesion molecules alpha 2 integrin, beta 1 integrin, intercellular adhesion molecule 1 (ICAM-1), vascular cell adhesion molecule 1 (VCAM-1), leukocyte function antigen 1a (LFA-1a), and E-selectin in different histological subtypes of basal cell carcinomas.

METHODS: BCCs were obtained from patients undergoing Mohs surgery. The BCCs were classified as nodular, micronodular, mixed, infiltrative, and basosquamous types and stained using an avidin-biotin-immunoperoxidase technique with antibodies against alpha 2 integrin, beta 1 integrin, ICAM, LFA-1a, VCAM-1, and E-selectin.

RESULTS: BCCs expressed alpha 2 and beta 1 integrin, but no significant differences in the amount or pattern of expression was seen in the different histologic subtypes.

CONCLUSION: The expression of integrins by BCCs by binding to the surrounding stroma may limit BCC's growth; however, their expression does not appear to correlate with their histological pattern.

Trichilemmal carcinoma

Mon, 06/02/2014 - 3:05pm

Trichilemmal carcinoma is an uncommon cutaneous neoplasm that occurs in sun-exposed areas of older persons. It is thought to be related to the external root sheath of the hair follicle and to be the malignant counterpart of a trichilemmoma. We describe a case of trichilemmal carcinoma treated with Mohs micrographic surgery.

Microcystic adnexal carcinoma. Case report and review of the literature

Mon, 06/02/2014 - 3:05pm

Microcystic adnexal carcinoma is an aggressive, locally destructive cutaneous neoplasm with a high rate of recurrence. This tumor is often misdiagnosed clinically and histologically. It usually occurs in middle-aged to older adults. We describe a 44-year-old man with a large microcystic adnexal carcinoma that was present for more than 20 years. The tumor invaded the perichondrium, muscle, nerve, and blood vessel adventitia. A review of the literature suggests that these tumors are often histologically misdiagnosed because the biopsy specimens may be too small to reveal all the characteristic histologic features. The clinical presence of marked induration, a smooth surface, and, possibly, sensory changes should alert the clinician to the possibility of this neoplasm. The initial biopsy specimen must be large enough to demonstrate the identifying histologic features. Mohs surgery is currently the treatment of choice for microcystic adnexal carcinoma, as it often spreads far beyond clinically evident tumor.

Arsenic in Dermatology

Mon, 06/02/2014 - 3:05pm

BACKGROUND: Arsenic is a chemical carcinogen that exists naturally and in the workplace.

OBJECTIVES: Review exposure, clinical signs of arsenic exposure, and the carcinogenic potential.

METHOD: Review of literature.

RESULTS: Arsenic is a known carcinogen that occurs both naturally and in the workplace. It causes cutaneous malignancies, hyperpigmentation, palmer and plantar keratosis, and internal malignancies, especially of the lung and bladder.

CONCLUSION: Exposure risks need to be well publicized. Those people with known exposure need regular full skin exams as well as close follow-up by their primary care physician.

Stump the experts. Apocrine hidrocystoma

Mon, 06/02/2014 - 3:05pm

Malignant melanoma with clinical and histologic features of Merkel cell carcinoma

Mon, 06/02/2014 - 3:05pm

We describe a patient with malignant melanoma that resembled a Merkel cell carcinoma both clinically and histologically. Immunohistochemical studies showed focally positive staining with S-100 protein and strongly positive staining with HMB-45. Ultrastructural study confirmed the diagnosis by demonstrating premelanosomes and melanosomes. Although the tumor appeared to be clinically unimpressive, it was a deep melanoma with a Breslow level of 3.8 mm that necessitated aggressive treatment. Small cell melanoma must be considered in the differential diagnosis of small cell tumors, which also includes lymphoma, eccrine carcinoma, squamous cell carcinoma, and Merkel cell carcinoma. The diagnosis of amelanotic melanoma, including the small cell variant, may require electron microscopic studies.

Management of a hidradenoma with Mohs micrographic surgery

Mon, 06/02/2014 - 3:05pm

BACKGROUND: Hidradenomas are adnexal tumors that may grow to be very large and frequently recur after excision. Malignant transformation and metastatic spread can occur and histologic distinction of benign from malignant hidradenomas can be very difficult. Some tumors with bland histology have demonstrated aggressive behavior.

OBJECTIVE: To decide the benefits of management with Mohs micrographic surgery of large hidradenomas.

METHODS: The literature was reviewed, including both the clinical course of the tumor and histologic features. The case of our report was interpreted in light of the review.

RESULTS: Three stages of Mohs surgery were required for complete removal of the hidradenoma. The patient remains free of recurrence.

CONCLUSION: This report highlights the difficulties in distinguishing benign from malignant hidradenomas and emphasizes the benefits of Mohs surgery for large or recurrent tumors.