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Transpedal lymphatic embolization for lymphorrhea at the graft harvest site after coronary artery bypass grafting

Lymphorrhea is a rare but potentially severe complication that occurs after various surgical procedures. Untreated lymphorrhea may lead to wound dehiscence, infection, and prolonged hospital stay. Currently, there is no standard effective treatment. Early management usually includes leg elevation, drainage, and pressure dressing. However, these methods are associated with prolonged recovery and high recurrence rates. We report a case of lymphorrhea from a calf wound after endoscopic great saphenous vein (GSV) harvesting for coronary artery bypass grafting (CABG). The patient presented with intractable oozing from the postoperative wound on the right calf. Lymphorrhea perGsisted for 6 weeks despite negative-pressure wound therapy with a long-acting somatostatin. We performed unilateral pedal lymphangiography that confirmed wound lymphorrhea, followed by glue embolization. No recurrence was observed after 8 months of follow-up. This case report demonstrates the successful use of lymphangiography with glue embolization in the control of lymphorrhea after GSV harvesting for CABG.

calf. This was managed conservatively with NPWT. During the subsequent 6 weeks, the oozing continued. Therefore, direct pedal lymphangiography and percutaneous embolization were requested.
The patient was transferred to the interventional radiology suite and placed in the supine position on the operating table. The foot ipsilateral to the leakage site was selected, and 0.5 mL of methylene blue was injected intradermally into the web spaces of the right foot. After waiting for 10 minutes, the injected methylene blue was released through the medial calf wound, thereby confirming lymphorrhea (Fig. 1).
A transverse cutaneous incision at the foot dorsum and dissec-tion of the surrounding soft tissue were performed to expose a lymphatic vessel with blue staining. Then, the isolated lymphatic vessel was cannulated using a 26-gauge (G) LG needle (Cook, Bloomington, IN, USA). After accessing the lymphatic vessel, 2 to 3 mL of contrast agent (Lipiodol; Guerbet, Paris, France) was injected at a rate of 0.2-0.4 mL/min using an injection pump. Serial fluoroscopic images were obtained until the interrupted lymphatic vessel leaking into the calf wound was identified. Then, we performed embolization of the culprit lymphatic vessel through initially cannulated 26-G LG needle at the foot dorsum using NBCA and lipiodol mixture in a ratio of 1:4 ( Fig. 2). To prevent recurrence, after additional cannulation of the midportion of the culprit lymphatic vessel, further embolization was performed using the same NBCA and lipiodol mixture (Fig. 2C). During percutaneous NBCA embolization, polymerized glue cast was released through the wounds (Fig. 2D). After embolization, initially cannulated proximal lymphatic vessels ( Fig. 2A) at the transverse incision site of the foot dorsum were ligated. After successful embolization, the oozing finally stopped. However, despite embolization and wound management for 2 months, the patient underwent skin grafting for prolonged wound exposure and wound dehiscence. Then, the patient was discharged from the hospital.

Discussion
We described an approach for the management of refractory lymphorrhea using pedal lymphangiography and subsequent NBCA embolization. As in our case, conservative management is recommended before invasive treatment. Conservative options include low-fat diet with medium-chain triglycerides, total parenteral nutrition, drainage, somatostatin, and NPWT. However, lymphorrhea involves a large amount of output and difficult-to-find leakage site and can be refractory to conservative treatment. In such cases, surgical or interventional management has been the standard of care. However, several patients with lymphorrhea are not eligible for surgery because of various reasons. Furthermore, the surgical approach requires imaging workup to ascertain the exact location of the leak. Compared with surgery, lymphangiography with or without embolization can be performed as a diagnostic and therapeutic test. Moreover, lymphangiography is superior to surgery in terms of minimal invasiveness. Currently, pedal lymphangiography has been replaced with the less cumbersome and more feasible intranodal lymphangiography. The intranodal approach has recently been introduced and remarkably reduced time and effort compared with the conventional pedal lymphangiography approach [3][4][5]. However, intranodal lymphangiography cannot be performed at the below-theknee level because the lowest lymph node is present in the popliteal area [6].
In conventional pedal lymphangiography, the web space is usually recognized as the standard injection site. However, this approach does not always allow visualization of complete lower leg lymphatics. Shinaoka et al. [6] reported that injection into this web space demonstrates lymphatic vessels only in the anteromedial group. The anteromedial and posteromedial groups did overlap in the leg; however, the anterolateral and posterolateral groups were independent. Therefore, with respect to the region, the site of methylene blue injection should be modified. In our case, dam-aged lymphatic channels were on the anteromedial side. Thus, injecting it into the web space was sufficient to reveal lymphorrhea.
Lymphatic vessel cannulation with a fine needle is challenging. Usually, the lymphatic vessel diameter is smaller than that of a conventional fine needle (26 G). To increase the accuracy of the puncture, parallel advancement of the needle along the lymphatic vessel is important. In this method, the needle tip can cannulate the lymphatic vessel wall multiple times, and slow injection of contrast materials can enable accurate puncture.
In summary, we presented a case of successful percutaneous lymphatic vessel embolization with NBCA for intractable lymphorrhea at the graft harvest site after CABG. Understanding the lymphatic anatomy and relevant techniques is essential for this type of procedure.