ObjectiveTo explore the plastic surgical treatment and the way to reduce hemorrhage for scalp and facial plexiform neurofibromas. MethodsBetween July 2004 and July 2013, 20 patients with scalp and facial plexiform neurofibromas (17 cases of neurofibromatosis type Ⅰ and 3 cases of plexiform neurofibroma) were treated, and the clinical data were retrospectively analyzed. There were 9 males and 11 females with an average age of 37 years (range, 18-56 years). The disease duration ranged from 8 to 56 years (mean, 19 years). The scalp was involved in 6 cases, the face in 7 cases, and both the scalp and face in 7 cases. The extent of involvement ranged from 4 cm×3 cm to 15 cm×13 cm. Obvious pigmentation was seen in 2 cases. Endovascular embolization was performed before surgical intervention in 4 cases. Preliminary sutures around the lesion were carried out in 18 cases having an involved range over 5 cm×5 cm. One-stage excision was performed in 17 cases, and two-stage excision in 3 cases. Wound repair and facial orthopedic treatment were performed after tumor excision. ResultsThe intraoperative blood loss was 100-500 mL (mean, 300 mL) for patients undergoing single operation. For 3 patients undergoing two-stage excision, the blood loss of the first operation was 500, 600, and 800 mL respectively, and the blood loss of the second operation was all 50 mL. Autologous blood transfusion of 200, 400, and 400 mL was performed in 3 cases respectively. The preliminary sutures were removed at 3-7 days (mean, 5 days) after operation. All the incisions healed primarily without secondary hemorrhage and hematoma, and the flap and skin graft survived totally. Fifteen patients were followed up 1 year to 7 years (mean, 2.5 years). All patients showed significant improvement in appearance. No significant progression, expanding, and sagging were observed. ConclusionEndovascular embolization and preliminary sutures around the lesion can be used to reduce hemorrhage in resection of plexiform neurofibroma in the scalp and face. Personalized surgical plan of benign neurofibromatosis should be made to reduce the tumor mass, to improve function and appearance.
Magnetoelastic (ME) sensors, characterized by wireless, passive, low cost and high sensitivity, have widespread applications in various fields. However, its defects of large volume, high power consumption, poor portability and inconveniency for use limit the application prospects of the ME sensors. To solve this problem, the present paper shows a portable, low-power, resonance-type ME sensor detecting system based on STM32. The experimental results indicated that this detecting system allowed the ME sensor to complete the measurement of resonant frequency in different medium and different concentration, with a frequency resolution of less than 1 Hz, and the resonant frequency ratio of ME sensors in different sizes 0.933 8, closing the theoretical value of 0.942 3. Moreover, compared with the traditional impedance analyzer combined detecting system and the existing integrated detecting system, the present system has a power consumption of 0.68 W in operation and of only 2.20 mW in the dormancy mode. Therefore, the system can not only replace the original impedance analyzer combined detecting system, but also significantly improve the power control of the existing integrated detecting system, exhibiting the advantages of higher integration, portable measurement, and fine suitability for long-term monitoring.