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Biomedical subjects

Sirunya Silapunt

Publications and source records attributed to Sirunya Silapunt.

At least 19 recordsLinked to original sources
PubMed2005

Analysis of 197 female scalp tumors treated with Mohs micrographic surgery.

BACKGROUND: There has been no previously published study on skin cancers on the scalp of women. OBJECTIVES: To better elucidate the characteristics of skin cancers that develop on the female scalp. METHODS: A retrospective review of 13,885 biopsy-proven skin cancers treated by Mohs micrographic surgery was performed. We identified 197 tumors on the scalp of women. Demographic features and tumor characteristics were compiled and analyzed. RESULTS: The average age of women with scalp tumors was 61.8 +/- 16.9, which was significantly lower than that of men with scalp tumors. The age followed a bimodal distribution with peaks in the fifth and eighth decades. Overall, 77% of female scalp tumors were basal cell carcinomas (BCCs), 17% were squamous cell carcinomas (SCCs), and 6% were a variety of other tumors. This contrasts with men in whom 53% of tumors were squamous cell carcinomas. Basal cell carcinomas were significantly more common in women under age 50. CONCLUSION: Skin cancers of the female scalp tend to be basal cell carcinomas, many of which occur at a relatively young age as compared to other skin cancers. The exact role of ultraviolet radiation in the development of some of these tumors is unclear.

Adolescent↗
PubMed2005

Surgical repair of temple defects after Mohs micrographic surgery.

BACKGROUND: It is typically recommended that linear surgical closures follow a relaxed skin tension line (RSTL). In the temple, these lines generally run parallel to the orbital rim. However, closures parallel to RSTLs are not feasible for many medium and large surgical defects because of anatomic constraints. OBJECTIVES: We sought to describe our method of repairing temple defects and assess the cosmetic outcome of temple defects repaired perpendicular to the RSTLs. METHODS: We performed a two-phase study of temple closures. In the first phase, a retrospective analysis was performed to assess the defect size and type of closure used for 99 consecutive temple defects. In the second phase, 27 of 86 patients who previously underwent linear surgical repairs in the temple that were designed perpendicular to the RSTLs were evaluated 12 to 24 months postoperatively to assess the cosmetic outcome. Results In the first phase of the study, there was an inverse correlation between the width of the postoperative defect and the ability to close the defect parallel to the RSTLs. The percentage of defects that could be repaired parallel to the RSTLs for defects up to 1 cm in width, 1.1 to 2 cm in width, and greater than 2 cm in width was 46%, 28%, and 8%, respectively. In the second phase of the study, 27 patients with temple defects repaired perpendicular to the RSTLs were evaluated an average of 1.7 years after operation. Most scars (83%) were clinically invisible or barely visible. There were no cases with residual standing cones (dog-ears) or hypertrophic scars. CONCLUSION: The vast majority of temple defects can be repaired in a linear fashion. Smaller defects (width < 1 cm) can be repaired parallel to the RSTL. Those that are larger (width 1-3 cm) or more medially located can be repaired perpendicular to the RSTL, using loose cheek skin for the closure. Very large defects (width > 3-5 cm) or those with limited cheek mobility may require flaps or skin grafts for closure.

Cosmetic Techniques↗
PubMed2005

Efficacy of narrow-margin excision of well-demarcated primary facial basal cell carcinomas.

BACKGROUND: A 4-mm surgical margin of clinically normal skin is the current standard for elliptical excision of basal cell carcinomas (BCCs). However, a 4-mm surgical margin is often not feasible on the face because of cosmetic and functional concerns. As such, facial excisions of BCCs are typically performed with the appropriate margin determined by the surgeon based on clinical features of the tumor. OBJECTIVE: We designed a study to test the efficacy of narrow-margin elliptical excisions for the treatment of small, well-demarcated facial BCCs. METHODS: A total of 134 primary, small (<1 cm), well-demarcated, facial nodular BCCs were excised as an ellipse with 1-, 2-, or 3-mm margins around the visible border of the tumor. The margin used was decided by the dermatologic surgeon based on cosmetic, anatomic, and functional factors, with the goal of clearing the tumor in a single excision. Using the Mohs technique for elliptical specimens, frozen sections were prepared and examined microscopically to provide complete histologic margin control. RESULTS: In all, 134 facial BCCs were included in the study. On average, the tumors measured 0.6 x 0.5 cm. Of these, 27 (20.1%) had positive margins, requiring additional excision. Excisions with 1-, 2-, and 3-mm margins were associated with positive margins in 16%, 24%, and 13% of tumors, respectively. There was no statistically significant difference in the occurrence of positive margins based on tumor size, anatomic location, or the measured margin used. CONCLUSION: Narrow margins (1-3 mm) are inadequate for the excision of small, well-demarcated, primary nodular BCCs of the face. To avoid repetitive operations and the risk of recurrence in anatomically sensitive areas, these tumors should be treated with standard wide margins (eg, 4 mm), or have Mohs micrographic surgery for histologic margin control.

Basal Cell Carcinoma↗
PubMed2005

Clinical appearance of full-thickness skin grafts of the nose.

BACKGROUND: Full-thickness skin grafting (FTSG) is an option for reconstruction of nasal defects. OBJECTIVE: To correlate the clinical outcome of FTSG on the nose with donor site, location of the defect, and defect size. METHODS: Patients with FTSG on the nose following Mohs' micrographic surgery were enrolled. Clinical and photographic assessments were performed. RESULTS: There were 54 FTSGs; the mean age was 20.6 months, and the average size was 2.1 cm2. The clinical assessment score was significantly different across donor sites, with dog-ear skin providing the best results, followed, respectively, by conchal bowl, preauricular, postauricular, and inner arm skin (p = .006). The global clinical outcome determined from the clinical assessment score was good for inner arm skin and excellent for other sites. The photographic assessment score was not different among donor sites (p = .601). There was no correlation of location and size of the defect to the clinical outcome assessed clinically and photographically (p>.05). CONCLUSION: All potential donor sites should be considered to select the donor site that best matches the defect.

Adult↗
PubMed2005

Low-level laser therapy for wound healing: mechanism and efficacy.

BACKGROUND: Given the recent interest in light-emitting diode (LED) photomodulation and minimally invasive nonablative laser therapies, it is timely to investigate reports that low-level laser therapy (LLLT) may have utility in wound healing. OBJECTIVES: To critically evaluate reported in vitro models and in vivo animal and human studies and to assess the qualitative and quantitative sufficiency of evidence for the efficacy of LLLT in promoting wound healing. METHOD: Literature review, 1965 to 2003. RESULTS: In examining the effects of LLLT on cell cultures in vitro, some articles report an increase in cell proliferation and collagen production using specific and somewhat arbitrary laser settings with the helium neon (HeNe) and gallium arsenide lasers, but none of the available studies address the mechanism, whether photothermal, photochemical, or photomechanical, whereby LLLT may be exerting its effect. Some studies, especially those using HeNe lasers, report improvements in surgical wound healing in a rodent model; however, these results have not been duplicated in animals such as pigs, which have skin that more closely resembles that of humans. In humans, beneficial effects on superficial wound healing found in small case series have not been replicated in larger studies. CONCLUSION: To better understand the utility of LLLT in cutaneous wound healing, good clinical studies that correlate cellular effects and biologic processes are needed. Future studies should be well-controlled investigations with rational selection of lasers and treatment parameters. In the absence of such studies, the literature does not appear to support widespread use of LLLT in wound healing at this time. Although applications of high-energy (10-100 W) lasers are well established with significant supportive literature and widespread use, conflicting studies in the literature have limited low-level laser therapy (LLLT) use in the United States to investigational use only. Yet LLLT is used clinically in many other areas, including Canada, Europe, and Asia, for the treatment of various neurologic, chiropractic, dental, and dermatologic disorders. To understand this discrepancy, it is useful to review the studies on LLLT that have, to date, precluded Food and Drug Administration approval of many such technologies in the United States. The fundamental question is whether there is sufficient evidence to support the use of LLLT.

Animals↗
PubMed2005

Squamous cell carcinoma of the auricle and Mohs micrographic surgery.

BACKGROUND: Squamous cell carcinoma (SCC) of the ear compared with SCC occurring at other skin sites has an increased incidence of recurrence following treatment. OBJECTIVE: To determine the following variables: patient age and gender, life status, tumor location, and recurrence rate following Mohs micrographic surgery (MMS). METHODS: The charts of 117 patients with 144 invasive SCCs of the auricle were reviewed. The patients were contacted by telephone to confirm tumor recurrence and patients' life status. The range of follow-up was 7 to 67 months (average 34.6 months) after MMS. RESULTS: The patients' ages ranged from 34 to 90 years (mean age 71 years). The male to female ratio was 22:1. The helix was the most common site of occurrence (50.7%). Local recurrence after MMS was found in four patients (five tumors). MMS was performed on these five recurrent tumors, with no further recurrences. Telephone confirmation was obtained on 91 patients (26 patients could not be contacted) with 122 tumors, which included the 4 patients with 5 recurrent tumors. There were no additional recurrences. Of these 122 tumors, 35 were followed for less than 2 years (average 16.6 months), and 87 were followed for 2 years or more (average 41.8 months). From the chart review and telephone contact, the 2-year local recurrence rate was 5.7% (5 of 87 tumors) after MMS. The average size of these 87 tumors was 3.5 cm2. Twelve of 91 patients had died with evidence of active disease from causes unrelated to SCC. CONCLUSION: Invasive SCC of the ear was once a formidable disease with a severe prognosis. The course of this disease has been appreciably improved by early diagnosis and treatment with MMS.

Adult↗
PubMed2004

Keratoacanthoma as a postoperative complication of skin cancer excision.

BACKGROUND: Keratoacanthomas usually occur spontaneously as a single rapidly growing tumor on sun-exposed skin. Multiple keratoacanthomas are rarely seen. Keratoacanthomas may also develop after trauma, laser resurfacing, radiation therapy, and at the donor site after skin grafting. OBJECTIVE: We report 6 cases of keratoacanthomas that developed in and around healing and healed surgical sites after treatment of skin cancer. These tumors developed 1 to 3 months after surgery and were sometimes multiple. METHODS: We performed follow-up examinations of patients' wounds after the treatment of skin cancer. Histological examination of nodules developing in the margins of healing wound sites and in the scars of healed wound sites after Mohs micrographic surgery revealed keratoacanthomas. RESULTS: The tumors presented as a rapidly growing nodule or nodules, with the typical morphology and pathology of keratoacanthoma. One patient developed multiple keratoacanthomas at surgical and nonsurgical sites. These nodules were treated by a combination of excision, curettage and electrodesiccation, and oral isotretinoin, 4 mg/d. CONCLUSION: Keratoacanthoma must be considered in the differential diagnosis of a rapidly growing nodule within or around the surgical site after skin cancer surgery.

Aged↗
PubMed2004

Cutaneous oncologic and cosmetic surgery in geriatric patients.

A wide array of surgical procedures is available to geriatric patients. These interventions can enhance the appearance of patients and facilitate the removal of skin cancers. Pre-existing medical conditions of geriatric patients must be considered comprehensively when selecting and performing cutaneous surgical procedures. Many older patients suffer from a variety of diseases and take a variety of medications and herbal supplements to ameliorate the consequences of such diseases. In general, skin surgery can be performed safely on even very old patients, provided precautions are followed. The biopsychosocial well-being and essence of patients must also be addressed when performing dermatologic surgery. If patients are treated holistically and comprehensively, their surgical experience can be enhanced and their health and appearance improved.

Dermatologic Surgical Procedures↗
PubMed2004

Eyebrow reconstruction: options for reconstruction of cutaneous defects of the eyebrow.

BACKGROUND: Reconstruction of cutaneous eyebrow defects is a challenge, as eyebrow positioning provides an important role in communication, cosmesis, and signaling age, gender, and emotional status. Special consideration must be paid in order to maintain eyebrow symmetry and to avoid distortion of the hairline. OBJECTIVE: To demonstrate reconstructive options for the eyebrow that preserve maximal function and cosmesis. METHODS: The anatomy and function of the eyebrow are reviewed. Descriptions of five techniques of eyebrow reconstruction are then presented, including specific limitations and benefits of each closure option. Pertinent details regarding flap mechanics, design, and patient selection are also included. RESULTS: There are several options available for reconstruction of the eyebrow. Each closure method has advantages and disadvantages. The selection must be individualized, depending on the extent and location of the eyebrow defect relationship to other structures, gender, and age of patients. Each of the five closure options aid to maintain the function and aesthetic appearance of the eyebrow. CONCLUSION: Understanding the unique anatomy and function of the eyebrow, including its movement in facial expression, is useful in achieving good reconstructive outcomes while maintaining normal eyebrow function.

Eyebrows↗
PubMed2004

Basal cell carcinoma arising in a port-wine stain.

BACKGROUND: The occurrence of basal cell carcinoma within a port-wine stain or nevus flammeus is rare. Sixteen cases of basal cell carcinoma which developed in a port-wine stain or nevus flammeus have been reported. OBJECTIVE: The objective was to demonstrate a rare case of basal cell carcinoma occurring in a port-wine stain successfully treated with Mohs micrographic surgery. METHODS: This is a case report and literature review. RESULTS: An 87-year-old man presented with a basal cell carcinoma on the margin of a previously untreated port-wine stain on the left cheek. Histologic examination showed a nodular basal cell carcinoma. The basal cell carcinoma was completely excised with Mohs micrographic surgery and complex linear closure was used to repair the wound in layers. The postoperative course was complicated by a hematoma, which developed 24 hr postoperatively. The hematoma was drained and there was no further bleeding or evidence of recurrence of the tumor after 12 months. CONCLUSION: Basal cell carcinoma should be included in the differential diagnosis of a skin lesion occurring in a port-wine stain.

Aged↗
PubMed2004

Pigmented speckling as a sign of basal cell carcinoma.

BACKGROUND: Basal cell carcinoma may present as a discrete skin-colored papule, which may mimic other common skin tumors. OBJECTIVES: We present pigmented speckling as a clinical sign for basal cell carcinoma. METHODS: Twenty cases of basal cell carcinoma with pigmented speckling were collected and their clinical and histologic features were reviewed. RESULTS: There were 12 men and 5 women. The patients' average age was 70.5 years (range 33-90 years). Fifteen of the 17 tumors were on the head and neck, and 2 tumors were on the shoulders and back. Clinical examination revealed a "speckled appearance" of brown-black pigmentation within and/or at the border of the tumors. Histopathology showed basal cell carcinoma with melanin pigment (positive for Fontana-Masson stain and negative for Perl's stain) within nests of tumor cells. CONCLUSION: The speckled pigmentation of a basal cell carcinoma is a distinguishing feature, which may be useful in the differential diagnosis of this tumor from other discrete skin tumors.

Adult↗
PubMed2003

Topical and light-based treatments for actinic keratoses.

Actinic keratosis is currently believed to be an early stage in the evolution of squamous cell carcinoma. Active and intensive treatment of actinic keratosis may prevent the formation of invasive squamous cell carcinoma and potential metastases. While destructive methods of treatment of actinic keratosis remain the gold standard for the eradication of visible and palpable actinic keratoses, new medical therapies may accomplish this goal more comfortably and reliably for the patient. Newer topical medications, light therapy and photodynamic therapy are generating promising results that presage more widespread use in the future. These novel therapies for the early treatment of actinic keratosis may be administered in combination or serially, with the locus of treatment at any given time possibly restricted to a region of affected skin. Treatment of incipient or subclinical lesions may mitigate the risk of future squamous cell carcinomas lesions. Widespread actinic keratosis constitutes a persistent medical problem that requires long-term management. The role of traditional and novel treatments in the routine treatment of actinic keratosis will be determined by the efficacy, limitations and the practicality of each of these methods in individual patients. As the first stage of squamous cell carcinoma, actinic keratosis is worthy of prompt evaluation and active treatment.

Adjuvants, Immunologic↗
PubMed2003

Mohs tissue mapping and processing: a survey study.

BACKGROUND: Mohs micrographic surgery (MMS) is the most reliable, conservative, and tissue-sparing approach to the management of cutaneous malignancies. The concept of MMS is simple, but its technique, which involves a series of suboperations, is complex. OBJECTIVE: To define which techniques of Mohs tissue mapping and processing are presently employed by members of the American College of Mohs Micrographic Surgery and Cutaneous Oncology. METHODS: Five hundred eighty surveys of eight questions regarding different techniques used in Mohs tissue mapping and processing were mailed out to Mohs micrographic surgeons registered with the American College of Mohs Micrographic Surgery and Cutaneous Oncology. A total of 310 responses (53%) were collected between October and December 2002. The results were tabulated and analyzed. RESULTS: Most Mohs micrographic surgeons personally prepare the map of the tissue in relationship to the patient (66.5%). A hand-drawn picture with standard orientations is most frequently used to map and orient a tissue specimen (69.4%). Histotechnicians usually prepare the tissue specimen for cryostat processing (63.5%). A heat extractor and/or tissue cuts or "slits" are the preferred methods used to flatten tissue by 52.9% of respondents. Hematoxylin and eosin is the stain that is most commonly used (82.6%). Approximately 50% of Mohs micrographic surgeons cut the excised specimen from the first stage into two separate pieces. Each tissue piece is then commonly processed into three to six representative serial sections per glass slide (68.1%). These sections are most commonly cut at 5 to 6 microm (53.9%) and less frequently at 4 microm (21.9%). CONCLUSION: There is variability in mapping and processing techniques employed Mohs micrographic surgeons and their histotechnicians. As long as the integrity of each step of Mohs tissue mapping and processing is preserved, the high cure rate of the technique should be maintained.

Health Care Surveys↗
PubMed2002

Non-ablative laser treatment of facial rhytides: a comparison of 1450-nm diode laser treatment with dynamic cooling as opposed to treatment with dynamic cooling alone.

BACKGROUND AND OBJECTIVE: Non-ablative dermal remodeling has been shown to create new dermal collagen. This is thought to occur secondary to a laser-induced injury to the skin. Other mechanisms of injury may lead to similar results. The aim of this study was to evaluate the efficacy and complication rate of a 1450-nm diode laser and compare clinical effect when the laser is used in conjunction with cryogen cooling as compared to the use of cryogen cooling alone. STUDY DESIGN/MATERIALS AND METHODS: Twenty subjects, skin types I-IV, age range 42-70 years, with Class I and II rhytides were enrolled in the study. Subjects were treated with 2-4 laser treatments and cryogen cooling on one side of their face, while the contralateral side was treated with cryogen cooling alone. Subjects were evaluated six months after their final treatment. RESULTS: Thirteen subjects showed clinical improvement on the laser/cryogen treated side. No subjects were noted to have any improvement at the cryogen alone side. CONCLUSION: The 1450-nm diode laser can lead to non-ablative improvement of rhytides. This effect appears to be a direct laser induced effect.

Adult↗