Factors affecting volume change of myocutaneous flaps in oral cancer

Outcomes of Vascularized Versus Nonvascularized Adipofascial Grafts for Parotidectomy Reconstruction

Objectives: Parotidectomy defects can leave patients with considerable functional and cosmetic deformities. We aim to compare the success rates and complications associated with vascularized versus nonvascularized adipofascial grafts for reconstruction, including flap failure, return to surgery, infection, and delay to adjuvant treatment. Methods: Retrospective case series of patients undergoing either adipofascial anterolateral thigh (AFALT) free tissue transfer or free fat transfer (FFT) after parotidectomy from January 2010 to January 2020. Group comparisons and logistic regression were used to determine predictors of outcome measures. Results: Seventy-six patients underwent AFALT reconstruction, and 73 patients underwent FFT reconstruction. Patients treated with AFALT reconstruction had more aggressive tumor characteristics and underwent more complex resections, most commonly radical parotidectomy (n = 55, 72.4%). Postoperative complications at both the donor and recipient sites were more common in the FFT group (N = 20, 27.4% in FFT vs. N = 11, 14.5% in AFALT, odds ratio = 0.45, 95% confidence interval = 0.20-1.02, p = 0.052). Conclusions: Although used in more advanced disease and in a more heavily treated wound bed, the AFALT free flap was safe and associated with fewer infectious complications than that offered by FFT.

Chronological flap volume and distribution changes after reconstruction of total maxillectomy defect using a rectus abdominis myocutaneous flap

BACKGROUND/PURPOSE

After total or subtotal maxillectomy, reconstruction using a free rectus abdominis myocutaneous (RAMC) flap is a fundamental and useful option. The purpose of the present study was to clarify the degree of flap volume change and volume distribution change with time after total or subtotal maxillectomy and free RAMC flap reconstruction and to examine the factors affecting the results.

METHODS

A total of 20 patients who underwent total or subtotal maxillectomy with free RAMC flap reconstruction were examined, and the flap volume change rate (volume at final evaluation [POD 181-360] / volume at initial evaluation [POD 5-30]) was investigated using the results of imaging tests. Moreover, the flap was divided into four blocks (A-D) in the cranio-caudal direction, and the volume change of each block was individually analyzed.

RESULTS

The overall volume change rate of fat/muscle/total was 0.84 ± 0.21/0.36 ± 0.08/0.67 ± 0.15, at the mean follow-up period of 309±35 days after the operation. The multiple regression analysis revealed that weight loss (for fat), postoperative RT (for fat and muscle), and young age (for muscle) were independently associated with flap volume loss. The results also indicated that the fat volume was stable, whereas the muscle volume decreased to <40% over time, assuming there were no influencing factors. Regarding flap volume distribution change, the fat volume tended to gather toward the central-cranial direction, while the muscle volume gathered toward the cranial direction, and total flap volume gathered toward the central direction.

Volume Change of Muscle and Fat Portions of Latissimus Dorsi Myocutaneous Flap after Breast Reconstruction

Background

Myocutaneous flaps are composed of muscle and fat portions, and exhibit volume changes with time. However, no consideration is generally given to volume changes of muscle and fat portions occurring in the flap. Therefore, we conducted this study to analyze the volume changes of muscle and fat portions of pedicled latissimus dorsi myocutaneous flaps over time.

Methods

Sixteen patients who underwent breast reconstruction using a latissimus dorsi myocutaneous flap between 2009 and 2017 were enrolled in this study. Using their postoperative computed tomography scan data, we measured the volume of muscle and fat portions of the flap, and performed a statistical analysis of volume changes over time. We also measured the volume of latissimus dorsi muscle on the opposite side and compared the difference in muscle volume.

Results

The volume of the muscle portion of latissimus dorsi myocutaneous flap decreased by approximately 24%, from 6 months to postoperative year 2; from the third year, it shrank with a decrease rate similar to that of normal muscle. The fat portion of the flap showed no regular volume changes.

Conclusions

Atrophy of the muscle portion is the primary cause of volume change of latissimus dorsi myocutaneous flaps over time. it is necessary to understand the difference in the volume change patterns of the muscle and fat. To maintain a long-term satisfactory result, it is better to make the maximum possible use of the relatively stable fat portion rather than the muscle portion.

Magnitude of radial forearm free flaps and factors associated with loss of volume in oral cancer reconstructive surgery: Prospective study

BACKGROUND

Adequate flap volume is key to maintaining oral function after oral cancer surgery. This study aimed to evaluate changes in radial forearm free flap (RFFF) volumes after 1 year of follow-up following ablative tumor surgery in the head and neck.

METHODS

A prospective study that recorded the clinical data of 20 patients with head and neck cancer who underwent RFFF reconstruction. Magnetic resonance (MR) and Mimics Research 19.0 software were used to measure the RFFF volumes at 1, 3, 6, and 12 postoperative months.

RESULTS

Compared with one postoperative month, the RFFF volume decreased by 15.5%, 29.4%, and 42.0% at 3, 6, and 12 months, respectively, after surgery. A significant positive correlation between postoperative radiotherapy and RFFF volume changes was detected.

CONCLUSION

The volume of RFFF decreases with time. It is recommended to use overcorrection, with a 40% increase in RFFF volume, to reconstruct head and neck tumor-related defects.

Feasibility of virtual surgical simulation in the head and neck region for soft tissue reconstruction using free flap: a comparison of preoperative and postoperative volume measurement

In the head and neck region, preoperative evaluation of the free flap volume is challenging. The current study validated preoperative three-dimensional (3D) virtual surgical simulation for soft tissue reconstruction by assessing flap volume and evaluated fat and muscle volume changes at follow-up in 13 head and neck cancer patients undergoing anterolateral craniofacial resection. Patients received 3D virtual surgical simulation, and the volume of the planned defects was estimated by surgical simulation. Following en bloc resection of the tumor, the defect in the skull base was covered using a rectus abdominis myocutaneous flap. Following surgery, computed tomography scans were acquired at day 1 and at 6 and 12 months. Virtual planned defect was on average 227 ml (range, 154-315) and was 10% smaller than the actual flap volume in patients without skin involvement of the tumor. Between day 1 and 12 months post-surgery, the volume of fat and muscle tissue in the free flap dropped by 9% and 58%, respectively. Our results indicate that 3D virtual surgical simulation provides essential information in determining the accurate volume of the required free flap for surgical defect repair and may thus help improve surgical planning and functional and esthetic outcome.

Long-Term Stability of Vascularized Adipofascial Flaps in Facial Reconstruction

Objectives: To determine the quantitative volume change over time of vascularized adipofascial anterolateral thigh (AFALT) free flaps in facial reconstruction, and to evaluate patient factors that are associated with changes in volume. Methods: A retrospective review was performed on patients who underwent AFALT reconstruction for large volume parotid and midface defects after head and neck cancer surgery at a single tertiary care hospital from 2011 to 2018. Flap volume was measured at different time points using 3D Slicer, a free open source software for medical image computing. Trends in volume change over time were evaluated. A multiple linear regression model was used to analyze patient factors associated with mean final volume change. Results: Twenty-one patients were included. The median follow-up period from surgery was 17 months (interquartile range [IQR] = 9-25 months). The first imaging study was obtained a median of 3 months after surgery (IQR = 1-4 months). The majority of patients underwent postoperative radiation (20/21, 95%). Mean final total volume percentage change over time was 96.6% (standard deviation = 21.7%). After controlling for age, smoking history, recurrence, and length of follow-up, a reduction in body mass index (BMI) ≥1.5 U from baseline had the greatest association with mean final volume percentage change (β -31, 95% confidence interval: -52 to -11, p = 0.005). Conclusions: Free tissue transfer using AFALT flaps in the head and neck provided relatively stable volume maintenance over time, even after postoperative radiation. The volume of transplanted fat can change depending on patient factors, such as BMI.

Squamous cell carcinoma of the buccal mucosa involving the masticator space: a case report

Squamous cell carcinoma of the buccal mucosa has an aggressive nature, as it grows rapidly and penetrates well with a high recurrence rate. If cancers originating from the buccal mucosa invade adjacent anatomical structures, surgical tumor resection becomes more challenging, thus raising specific considerations for reconstruction relative to the extent of resection. The present case describes the surgical management of a 58-year-old man who presented with persistent ulceration of the mucosal membrane and a mouth-opening limitation of 11 mm. Diagnostic imaging revealed a buccal mucosa tumor that had invaded the retroantral space upward with involvement of the anterior border of the masseter muscle by the lateral part of the tumor. In this report, we present the surgical approach we used to access the masticator space behind the maxillary sinus and discuss how to manage possible damage to Stensen's duct during resection of buccal mucosa tumors.