Lympho-SPECT/CT as a tool to evaluate postoperative outcomes after LVA for lymphedema repair
Plastic and Reconstructive Surgery,
Correspondence Address: Dr. Jose M. Lasso, Plastic and Reconstructive Surgery, Hospital General Universitario Gregorio Marañón, C/Dr Esquerdo 46, Madrid 28007, Spain. E-mail:
Aim: To describe findings when comparing lympho-SPECT-CT images before and after lymphovenous anastomosis (LVA) surgeries and to correlate these results with pre- and post-operative volume changes in the limbs of patients.
Methods: An observational, prospective, longitudinal study was designed. 20 consecutive patients were treated for lymphedema by means of LVA between 2015 and 2018. All were affected by secondary lymphedema (ISG II-III) following lymphadenectomy, radiation or both. All patients received preoperative rehabilitation as well as radiotherapy after oncological surgery. Limb volume was measured before surgery and at one year later. LVA was performed under general anesthesia with ICG guidance. ICG was also used to evaluate postoperative outcomes. Lympho-SPECT-CT was performed in all subjects at their first consultation and at one year after every surgical intervention. Description of findings included an absence of lymph nodes, new lymph node activity in anatomical areas and new lymphatic activity in extra-anatomical areas.
Results: Limb volume decreased in 19 patients after LVA. Six patients showed preoperative linear ICG patterns, combined with areas presenting with another type of pattern. After LVA, the linear pattern was observed in 11 patients. SPECT-CT/lymphoscintigraphy before surgery showed a total absence of lymph nodes, except in two cases, in whom small nodes in anatomical locations were described. After LVA, we observed new landmarks in 16 patients corresponding to lymphatic circulation that was not present in preoperative studies. In six cases, new lymphatic activity compatible with lymph nodes was detectable after LVA. The Spearman correlation coefficient was negative when circumferences and lympho-SPECT-CT were tested (P = 0.02).
Conclusion: Results showed a postoperative decrease in volume that correlated inversely with lympho-SPECT/CT findings. Lympho-SPECT/CT provided additional information related to accurate identification and the anatomical location of lymphatic structures that were not observed before reconstructive surgery. It can be a complementary test to conventional lymphoscintigraphy.
Lymphedema is a debilitating disease in which drainage of the lymphatic system is impaired and affects a considerable number in the population. In developed countries, this is prevalent after pelvic or axillary radiotherapy, and lymph node dissection following oncologic surgery of the breast or pelvis. Unfortunately, secondary lymphedema and especially, primary lymphedema are still pathological conditions that cannot be treated definitively. Treatment prospects however, have improved for patients in the last decade due to new surgical techniques.
Current surgical treatments are based on microsurgical techniques[1-4]. The two main procedures are: lymph node transfer and lymphovenous anastomosis (LVA). Preoperative clinical evaluation of the patients and imaging studies of the lymphatic system are essential when surgery is planned for. On the other hand, postoperative imaging methods are crucial for understanding the efficacy of surgery.
Among these methods, lympho-SPECT/CT seems to be effective in evaluating lymphatic flow and to document lymph node regeneration. Previous publications have found that it should be a principal tool to complete functional evaluation of lymphedema.
We report a prospective study in 20 patients with secondary lymphedema that was treated with LVA. The degree of lymphedema ranged from II to III (ISL classification). Our main goal was to describe new findings using lympho-SPECT-CT images before and after surgery and to correlate these results with the respective volume changes.
An observational, prospective, longitudinal study was designed. 20 consecutive patients treated with LVA for lymphedema at the Hospital Gregorio Marañón in Madrid between 2015 and 2018 were included. All were affected by secondary lymphedema of the lower or upper limbs following surgical lymphadenectomy, radiation or both. Patients were randomly selected in out-patient hospital. The inclusion criteria were: secondary lymphedema of a limb; no previous reconstructive surgery of the lymphatic system; patients with previous rehabilitation therapy were considered for inclusion in the study; those with an ISL classification of lymphedema of degree II and II; and lymphedema had to be established for at least one year before reconstructive microsurgery.
Pre- and postoperative evaluation was based on imaging and clinical examination. Limb circumference was measured at every 5 cm: point 1 - mid-palm or mid-foot, point 2 - bony landmarks (ulnar styloid process/lateral malleolus), C3-C8 - every 5 cm above point 2. The variable used for evaluation and follow-up was the circumference difference, which is equal to the sum of the differences between the involved and uninvolved limb at all points. The circumference difference was registered at first visit and at each postoperative visit after LVA. Results were considered stable and registered for analysis at the one-year-postoperative visit after surgery.
The clinical examination also included a record of complications, episodes of cellulitis and an enquiry about subjective symptoms. Subjective perception of the disease was evaluated with a patient survey that consisted of four questions utilizing a five-point Likert-type scale and a fifth enquiry about overall treatment satisfaction (Satisfaction with limb weight, appearance, firmness, ability to perform daily activities: scores ranging from 1-5, being 5 the highest score; and would you undergo surgery again? yes/no). The questionnaire was developed at our center and has been standardized for use in all lymphedema patients since 2008.
Surgical protocol (LVA-ICG)
In the operating room, ICG (VERDYETM; Diagnostic Green GmbH, Aschheim-Dornach, Germany) was injected intradermally into the first and fourth web spaces (0.1 mL per injection of a 25 mg/mL solution mixed with 5 mL of water for injection), 15 minutes later, circumferential fluorescent images of the lymphatic drainage channels were obtained using an infrared camera system (Photodynamic Eye, PDETM; Hamamatsu Photonics K.K., Hamamatsu, Japan). Lymphography patterns were described at this moment. Linear patterns or patterns that showed dynamic drainage of ICG were marked on the skin. ICG fluorescent images were obtained both before and during ICG-SL surgery and at every year postoperatively. Findings were labeled according to Yamamoto’s dermal backflow classification and contrasted with postoperative SPECT-CT/lymphoscintigraphy results. It was found that this ICG lymphangiography staging system had a significant correlation with the clinical stage of lymphedema. In the proximal part of the affected limb, dermal backflow patterns were more frequently found than linear patterns. The dermal backflow pattern is further divided into splash, stardust and diffuse patterns.
LVAs were performed under general anesthesia in all cases, with specific material and 12/0 monofilament sutures, under microscope magnification. Anastomoses were performed end-to-end and end-to-side, depending on the availability of recipient veins. Skin closure was achieved with superficial non-absorbable sutures (4/0) without subcutaneous sutures.
Oral antibiotics were prescribed for five days after surgery. Patients wore a soft non-elastic bandage that was replaced every 3 days for 3 weeks, under surgeons’ supervision. Subsequently, from the fourth week, customized compression sleeves were placed for three months. Lymphatic drainage was performed twice a week during this period. After drainage, patients wore elastic stockings as instructed. On the other hand, conservative therapy prior to LVA consisted of lymphatic drainage that started three weeks before (twice per week).
Lympho-SPECT/CT was performed in all subjects at the first consultation and at every year after surgical intervention. Lymphography was done with 46 MBq Tc-99m of nanocolloidal human albumin (Nanocoll, GE Healthcarec) injected into the subcutaneous plane at the second web space in each limb (both healthy and affected) after dilution in 0.15 mL of 0.9% sodium chloride. As 85% of colloids are smaller than 80 nm, a 30-gauge needle was required. The interval between injections was less than 30 s.
As patients may have severe alteration of lymphatic flow due to fibrosis or ectasia, they were asked to walk around or elevate the arms for 30 min before obtaining planar images. Conventional lymphoscintigraphy was then performed: anterior and posterior planar images from shoulder to hand (hip to foot) were acquired to obtain early (30 min) and late (2 h) images with a gamma camera (GAMMGc) and low energy-high resolution collimator (LEHR). The acquisition from each time point proceeded over 10 min.
SPECT-CT images were acquired over 30 min, starting at 3 h after injection of the nucleotide using a dual-head combined SPECT/CT camera (OptimaTM NM/CT640, General Electric) with the following parameters: 128 × 128 matrix, rotation of 360º, 4º view angle, 25 s per projection; slice thickness was 2.5 mm. Two nuclear medicine specialists reviewed all images regarding the detectability and number of lymph nodes.
Description of imaging findings included the absence of nodes, improved drainage of the lymph node basin, new lymphatic drainage in extra-anatomical position, and traces of the nucleotide constituting spots along the lymphatic system of the limb. Data acquired were compared with postoperative SPECT-CT/lymphoscintigraphy results.
Categorical variables were described as numbers and percentages. Continuous variables were described as median (interquartile range). Lympho-SPECT-CT findings were described as: absence of nodes (0); traces of the nucleotide constituting spots along the lymphatic system of the limb (1); improved drainage of the lymph node basin (2); and new lymphatic drainage in extra-anatomical position - elbow, supraclavicular, parascapular (3). Correlation between continuous variables was evaluated using the Spearman coefficient. Statistical significance was defined as P < 0.05. IBM SPSS software was used for calculation of the above.
The patients’ age ranged from 25 to 76 years old, with a mean of 48.3 years. Sixteen and four patients had upper and lower limb lymphedema respectively. Eighteen patients were female.
The duration of disease from diagnosis to LVA surgery ranged from 15 months to 11 years. Fifteen patients had lymphadenectomy and postoperative radiotherapy (14 in the axilla and 1in the groin); four had sentinel node biopsy and postoperative radiotherapy (2 axilla, 2 groin) and a single patient had radiotherapy (in the groin after pelvic surgery). A mean of 4.35 (range, 2-10) anastomoses were performed in each affected limb. In all cases, follow-up was more than 12 months after surgery (range, 12-24 months). All patients underwent preoperative rehabilitation, with different criteria. Six of them did not improve with non-surgical therapy while the rest worsened when therapy was discontinued [Table 1].
Progress is measured in months. When expressed in years, it is indicated along the table
|Patient||Age||Sex||Involved limb||ISL classification||Progress of lymphedema||Number of LVA||Preoperative rehabilitation|
|1||32||F||Upper right||II||25 months||3||Temporarily effective|
|2||45||F||Upper right||II||24 months||3||Temporarily effective|
|3||35||M||Lower left||II||3 years||4||Temporarily effective|
|4||41||F||Upper right||II||18 months||5||Non effective|
|5||38||F||Upper left||II||4 years||4||Temporarily effective|
|6||25||F||Lower right||III||15 months||4||Non effective|
|7||56||F||Upper right||II||25 months||2||Temporarily effective|
|8||39||F||Upper right||II||11 years||5||Temporarily effective|
|9||45||F||Upper left||II||3 years||4||Temporarily effective|
|10||67||F||Upper left||III||40 months||5||Non effective|
|11||45||F||Lower right||II||38 months||6||Temporarily effective|
|12||29||M||Upper left||II||3 years||3||Temporarily effective|
|13||76||F||Lower right||II||28 months||10||Temporarily effective|
|14||50||F||Upper left||II||24 months||4||Temporarily effective|
|15||62||F||Upper right||II||4 years||4||Non effective|
|16||65||F||Upper left||III||5 years||5||Non effective|
|17||60||F||Upper left||II||6 years||4||Temporarily effective|
|18||49||F||Upper left||II||25 months||5||Temporarily effective|
|19||53||F||Upper right||II||23 months||3||Non effective|
|20||55||F||Upper right||II||30 months||4||Temporarily effective|
After LVA, all patients reported a subjective decrease in weight and/or firmness of the limb, and an improvement in their quality of life, with a mean increase in overall satisfaction of 4.3 points in a 20-point survey. The improvement in “satisfaction with limb appearance” was the most significant. All patients responded “yes” to the question “Would you undergo surgery again?” after completing sequential therapy (LVA and rehabilitation).
No severe postoperative complications have been reported to date. Four patients had frequent episodes of cellulitis preoperatively that required hospital admission (three per year or more). None of them have had repeated limb infection except an obese woman with lower limb lymphedema who smoked and did not follow postoperative recommendations.
With respect to volume decrease, the circumference measurements reached near-normal values (less than 6 cm difference) in 15 patients [Table 2].
Results for each patient 1 year after LVA procedure (cm)
|Patient||Circumference difference preLVA (cm)||Circumference difference postLVA (cm)||Satisfaction before surgeries||Satisfaction after surgeries|
Table 3 shows pre- and post-operative ICG and SPECT-CT/lymphoscintigraphy results for all patients in our study. Findings of SPECT-CT/lymphoscintigraphy before surgery showed a total absence of lymph nodes, except in two cases, in which several nodes in anatomical (axilla or groin) locations were described. These presented with a smaller size than the healthy, contralateral ones (Figure 3, patient 3).
Fluorescence patterns are registered according to the images precepted 15 min after ICG injection
|PRE-LVA fluorescence pattern||POST-LVA fluorescence pattern||Baseline SPECT-CT/
|Post LVA SPECT-CT/
|2||Diffuse/stardust||Diffuse/linear in some areas||-||++|
|6||Linear, stardust||Linear - slow progression||-||+|
Figure 1. Pre-operative view of a ISL second degree lymphedema of the right upper limb showing a more affected cubital area. Red arrow
Figure 2. Post-operative view of a ISL second degree lymphedema of the right upper limb. The cubital area improved after lymphovenous anastomosis (red arrow).
Figure 3. Pre-operative lympho-SPECT showing a lymph node at the root of the affected limb (left limb) that is smaller than the contralateral one (blue arrow).
In 16 patients, there were new landmarks corresponding to lymphatic circulation that were not present in pre-operative studies. In two patients, there were new spots that presented in unexpected anatomical areas, which may be considered as new lymphatic pathways. In six cases, images compatible with new functional lymph nodes were detectable after LVA (Figure 4, patient 14).
Figure 4. New lymph node at the arm of the patient with lymphedema of the left upper limb, at one year after lymphovenous anastomosis (blue arrow). The contralateral side (right axilla) is marking a functional nodal group
When ICG evaluation was performed before surgery, most patients presented with a diffuse or splash pattern. In six cases, there were segments of a linear pattern in combination with another pattern. One year later, several changes were observed in these patients. Eleven presented with a linear pattern, with four in combination with another pattern [Table 3]. Lymph nodes were not detected with this technique however.
Figure 5 shows that in patient number 8, the stardust pattern had changed and new reticular and linear superficial patterns were observed after LVA. When lympho-SPECT/CT was correlated with these images, new images that were not visible before surgery could be observed.
Figure 5. Lympho-SPECT, lymphography and ICG evaluation in patient 8. A: Software reconstruction showing a positive node in the right infraclavicular area and elbow after lymphovenous anastomosis (LVA). Orange and yellow arrows are marking the new activity. We can also observe the right breast implant for reconstruction, as well as lymphography under three-dimensional reconstruction (blue arrow); B: development of linear and reticular patterns one year after LVA in the forearm of this patient
The Spearman correlation coefficient was significantly negative when circumferences and lympho-SPECT-CT were tested (P = 0.02).
Lymphoscintigraphy is a specific, simple and reliable technique that offers useful information of lymphatic function, allowing the examiner to detect lymphatic flow obstruction, dilated vessels, collateral lymphatic flow and the presence, malfunction or absence of lymph nodes[8-10]. Dermal uptake is a pathognomonic sign of lymphedema in limbs, and this finding is seen in most cases[11,12]. However, lymphoscintigraphy has limitations such as a two-dimensional view that does not allow projection onto anatomical landmarks. On the other hand, some artefacts can be observed when fibrosis, dermal backflow or accumulation in deeper vessels is seen.
SPECT-CT is currently combined with lymphoscintigraphy for the detection of sentinel lymph nodes in the diagnosis of several tumours. In lymphedema, SPECT-CT/lymphography systems provide integrated functional and morphological information, which allows better localization of the depth of vessels and lymph nodes. It is useful for accurate evaluation of anatomical differences between lymphatic vessels and veins and as well, it can provide better understanding of dermal backflow.
SPECT-CT might be useful for predicting treatment efficacy when staging lymphedema[16-18]. In fact, combined CT-imaging has allowed better comprehension of the pathophysiology of lymphedema. Many studies have also proposed using SPECT-CT imaging beyond diagnosis by reporting its value in microsurgical treatment, which is essential for understanding the behavior of the lymphatic system after LVA or lymph node transfer.
In this study, we evaluated the changes in lymphatic drainage one year after LVA and corroborated the effectiveness of surgical treatment. Our study population included a small group of randomly selected patients that were included in a prospective study. After analysis of lympho-SPECT-CT findings, we reported that in a majority of patients, regardless of the degree of lymphedema, there was evidence corresponding to new lymphatic circulation in images of the limbs (upper and lower limbs). We believe that LVA was not only useful in the reestablishment of lymphatic drainage through the venous by-passes, but also in developing collateral circulation (especially in two cases with extraanatomical landmarks). This could be explained in relation to the activation of new routes of drainage. Cases with new lymph nodes may indicate that drainage is greater, as has been demonstrated in experimental models. Interestingly, ICG findings are in concordance with these positive landmarks but we could not compare qualitative variables with quantitative ones to perform a better statistical analysis. In seven cases, we clearly observed that the linear pattern[21,22] obtained after LVA was accompanied by more remarkable findings on lympho-SPECT-CT.
On the other hand, we were able to evaluate the correlation between clinical parameters such as the volume of the limbs and findings on lympho-SPECT. In this case, we observed an inverse correlation coefficient with statistical significance, indicating that the reduction of limb volume that is observed after LVA is associated with a significant increase in the number of landmarks that support improvement and reestablishment of lymphatic drainage. There are many factors influencing the final result. This is a heterogeneous group of patients, with different ages and time of evolution of lymphedema. Our work includes both upper and lower limb lymphedema of different ISL stages, which make comparisons difficult. It has also been demonstrated that LVA studies have a poor quality of evidence and high risk of bias, and therefore, it is difficult to draw reliable conclusions on the clinical effectiveness of LVA.
Nevertheless, LVA seems to be safe for the treatment of primary and secondary lymphedema. If a reduction of volume can be demonstrated after LVA, we may think that lymphatic drainage has improved. In order to prove this, nuclear medicine testing would be an objective method to do so. If we are able to demonstrate such improvement by means of functional and anatomical landmarks (the development of new lymph nodes or the establishment of collateral circulation) that were not visible before surgery, we would then be in a position to confirm that surgery has been effective as it has been demonstrated that 99mTc-phytate lymphoscintigraphy with SPECT-CT can provide both functional and morphological information simultaneously in patients with upper-limb lymphedema. Using this modality, SPECT-CT may accurately reflect lymphodynamic conditions of the limbs after LVA. Furthermore, the surgical therapeutic efficacy could be estimated quantitatively by comparing pre- and postoperative findings.
In conclusion, our results have showed a postoperative decrease in volume of limbs with lymphedema that correlated inversely with lympho-SPECT/CT findings. Lympho-SPECT/CT provided additional information related to the accurate identification and anatomical location of lymphatic structures that were not observed before reconstructive surgery. It should be a complementary test to conventional lymphoscintigraphy.
The author contributed solely to the article.Availability of data and materials
Data supporting these findings can be found. Data can be deposited into the data repositories of the hospital, which can be accessed but not sent externally except for legal reasons.Financial support and sponsorship
None.Conflicts of interest
The author declared that there are no conflicts of interest.Ethical approval and consent to participate
The study was approved by the Ethics Committee and conforms to the Helsinki Declaration. Patients signed and gave informed consent for every operation and participation.Consent for publication
The authors and patients gave consent for publication.Copyright
© The Author(s) 2020.
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Cite This Article
Lasso JM. Lympho-SPECT/CT as a tool to evaluate postoperative outcomes after LVA for lymphedema repair. Plast Aesthet Res 2020;7:30. http://dx.doi.org/10.20517/2347-9264.2019.75
Lasso JM. Lympho-SPECT/CT as a tool to evaluate postoperative outcomes after LVA for lymphedema repair. Plastic and Aesthetic Research. 2020; 7: 30. http://dx.doi.org/10.20517/2347-9264.2019.75
Lasso, Jose M.. 2020. "Lympho-SPECT/CT as a tool to evaluate postoperative outcomes after LVA for lymphedema repair" Plastic and Aesthetic Research. 7: 30. http://dx.doi.org/10.20517/2347-9264.2019.75
Lasso, JM. Lympho-SPECT/CT as a tool to evaluate postoperative outcomes after LVA for lymphedema repair. Plast. Aesthet. Res. 2020, 7, 30. http://dx.doi.org/10.20517/2347-9264.2019.75
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