Editing Inguinal Node Dissection (section)

== Open Inguinal Node Dissection ==

=== Videos ===

*[https://www.youtube.com/watch?v=5HdhCDdDnP0 Video 1 (Dr. Franco Gaboardi)]
*[https://www.youtube.com/watch?v=92GnS90wv1M Video 2 (Dr. S. P. Somashekhar)]
*[https://www.youtube.com/watch?v=rOKs9Zyd5S4 Video 3 (Dr. Rajshekhar C Jaka)]

=== Equipment ===
*LigaSure™ 
*Bipolar forceps with foot pedal
*Standard instruments
**Scissors
***Metzenbaum scissors
***Suture scissors
**Clamps
***Tonsil clamp
***Hemostat clamp
***Right-angle clamp
***Babcock clamp
**Forceps
***Debakey forceps
***Russian tissue forceps
***Non-toothed Adson forceps
***Toothed Adson forceps
**Blunt Sponge Dissectors
*Small metal clips and clip appliers
*Sutures
**2-0 silk ties for lymphatics
**4-0 prolene on RB1 in case of vasculature injury
**2-0 Vicryl
*Retractors
**[[File:Weitlaner Retractor.jpg|alt=Weitlaner Retractor|thumb|Weitlaner Retractor. Source: [[commons:File:Weitlaner_Retraktor.jpg|Wikipedia]]]]Rake retractors
***Double hook retractor
***Senn retractor
**Weitlaner self retaining retractor

*Skin stapler and staples
*Drains
**Multiperforated closed-suction drains (10 or 15 French)

=== Antibiotics ===

* '''Broad-spectrum antibiotics (e.g. ampicillin/gentamycin or ampicillin/ciprofloxacin)[https://pubmed.ncbi.nlm.nih.gov/30730389/]'''[[
*In patients with pre-operative cellulitis or infection of the groin region, oral antibiotics (i.e., usually a 1st generation cephalosporin or penicillin) to treat and control this infection prior to surgical management is strongly advised.[https://pubmed.ncbi.nlm.nih.gov/18762945/]
**If the primary tumor is infected, Inguinal lymphadenectomy is best performed in a staged fashion n order to remove the infected source and provide appropriate antibiotic coverage based upon the clinical circumstances

=== DVT Prophylaxis ===

* '''Compression boots only'''
** '''Perioperative low-dose heparin may increase lymphatic leakage[https://pubmed.ncbi.nlm.nih.gov/30730389/]'''

=== Position ===

* '''Thighs slightly abducted and externally rotated (frog-leg[https://pubmed.ncbi.nlm.nih.gov/30730389/]) with cushioned support under the flexed knee.'''

==== Incision ====

* '''Oblique incision ≈2-3 cm below and parallel to the inguinal ligament (groin crease)[https://pubmed.ncbi.nlm.nih.gov/21481617/]'''
**'''Lateral end'''
***'''Radical inguinal lymphadenectomy: line drawn from the anterior superior iliac spine extending inferiorly'''
***'''Modified inguinal lymphadenectomy: vertical line drawn from above the femoral artery'''
**'''Medial end'''
***'''Radical or modified inguinal lymphadenectomy: line drawn from the pubic tubercle extending inferiorly'''
*Special scenario: When the overlying skin is involved with disease secondary to direct tumor invasion or broken down by infection or prior therapy and requires excision, consider an elliptical incision with resection of the involved skin and the subcutaneous tissue[https://pubmed.ncbi.nlm.nih.gov/27717432/]
**In this setting, the incision may alternatively be extended superiorly from the lateral border of the ellipse and inferiorly from the medial border to make a single S-shaped incision for the iliac and inguinofemoral dissections

=== Standard radical inguinal lymphadenectomy ===
*'''In the standard radical inguinal lymphadenectomy, both the superficial and deep inguinal lymph nodes are removed'''
*'''<span style="color:#ff0000">Indications[https://pubmed.ncbi.nlm.nih.gov/27717432/]</span>'''
**'''<span style="color:#ff0000">Clinically node-positive disease (palpable on physical exam)</span>'''

==== Boundaries of Dissection[https://pubmed.ncbi.nlm.nih.gov/16643509/ §] ====
* '''<span style="color:#ff0000">Superficial: Camper's fascia[https://www.youtube.com/watch?v=5HdhCDdDnP0]</span>'''
* '''<span style="color:#ff0000">Superior: inguinal ligament/superior boundary of the external oblique aponeurosis and the spermatic cord</span>'''
**'''<span style="color:#ff0000">Inguinal ligament is the portion of the external oblique aponeurosis which extends between the anterior superior iliac spine and the pubic tubercle as a thick band, folded inward[https://en.wikipedia.org/wiki/Aponeurosis_of_the_abdominal_external_oblique_muscle]</span>'''
* '''<span style="color:#ff0000">Medial: anterolateral border of adductor longus muscle</span>'''
* '''<span style="color:#ff0000">Lateral: sartorious muscle</span> (saphenous vein and femoral vein in modified template)[https://pubmed.ncbi.nlm.nih.gov/16643509/]'''
* '''<span style="color:#ff0000">Inferior: apex of the femoral triangle/fossa ovalis (where the saphenous penetrates the fascia lata)</span>'''
*'''<span style="color:#ff0000">Floor: pectineus muscle for deep dissection (fascia lata for superficial)</span>'''
**Note that adductor longus and sartorious are posterior to fascia lata and are therefore not the relevant medial and lateral boundaries for superficial dissection.
==== Step by step ====
* See [https://pubmed.ncbi.nlm.nih.gov/16643509/ BJUI Surgical atlas. Surgical management of penile carcinoma: the inguinal nodes]
*'''General anesthesia and insertion of lines.''' No need for naso/orograstric tube for gastric decompression during case.
* '''Patient positioning, antiseptic preparation, draping.'''
** After induction of general anesthesia...
** Trim hair overlying operative site, if needed
** Insert 16-Fr Foley catheter
** Externally rotate the hip and flex the knee. Place cushioned support under the flexed knees.
** Prepare area with chlorhexidine–alcohol scrub
***Preoperative skin preparation with a chlorhexidine–alcohol scrub provided a significantly lower surgical site infection rate at 30 days when compared to a skin prep with a povidone–iodine solution
**Drape with exposure of the umbilicus, pubic tubercle, anterior superior iliac spine, and anterior thigh
*'''Use marking pen to denote landmarks and incision.'''
** Landmarks
*** Anterior superior iliac spine
*** Pubic tubercle
****If middle finger is on pubic symphysis, index finger is on pubic tubercle
*** Inguinal ligament (line from anterior superior iliac spine to pubic tubercle)
***Femoral artery (if palpable, usually located approximately at the midpoint of the inguinal ligament)
***Fossa ovalis/saphenous opening (3–4 cm inferior and lateral to the pubic tubercle)
****See [https://radiologykey.com/anatomy-of-the-lower-limb/ Figure 31.2]
*'''Make skin incision[https://pubmed.ncbi.nlm.nih.gov/30730389/]'''
**Lateral end of incision is to a line drawn from the anterior superior iliac spine extending inferiorly and the medial end of the incision is to a line drawn from the pubic tubercle extending inferiorly
***The boundaries of dissection in a radical inguinal lymphadenectomy are defined by the superior margin of the external ring to the anterior superior iliac spine, laterally from the anterior superior iliac spine extending 20 cm inferiorly and medially to a line drawn from the pubic tubercle 15 cm downward[https://pubmed.ncbi.nlm.nih.gov/21481617/]
*'''Develop and raise superior and inferior skin flaps'''
**'''Use left hand to retract and Metzenbaum scissors/cautery to develop and raise superior and inferior skin flaps below Camper's fascia down to the level of the external oblique aponeurosis to expose the inferior border of the inguinal ligament and spermatic cord.'''
*** '''Important to leave a 6—8 mm thickness of subcutaneous tissue in contact with the skin to avoid necrosis[https://www.sciencedirect.com/science/article/pii/S1878788623000292]'''
****Care should be taken to preserve the superficial blood supply to the flaps, thus minimizing the risk of postoperative skin necrosis, infection, and wound breakdown
****Camper’s fascia can be preserved and left attached to the overlying skin when the superior and inferior skin flaps are fashioned.
*****Lymphatic drainage of the penis to the groin runs beneath the Camper fascia
*****Camper's fascia may appear as glistening layer
***Superior skin and subcutaneous tissue flap is developed ≈8 cm superiorly'''[https://pubmed.ncbi.nlm.nih.gov/21481617/]''' towards the inguinal ligament
****Spermatic cord if reflected medially[https://www.youtube.com/watch?v=5HdhCDdDnP0]
***Inferior skin and subcutaneous tissue flap is developed ≈6 cm inferiorly'''[https://pubmed.ncbi.nlm.nih.gov/21481617/]'''
***Develop flap medially to adductor longus aponeurosis
***Develop flap laterally to sartorious
**'''Handle the skin flap edges gently[https://pubmed.ncbi.nlm.nih.gov/27717432/]'''
***'''Assistant uses hooks initially and army navy retractors later to lift up on skin edge'''
***Avoid grasping of the flap edges with forceps because this could potentially crush and devascularize the tissue.
***Consider covering skin flap edges with saline-moistened sponges
**'''Reflect the spermatic cord medially'''
*'''Lymph node dissection'''
**'''Use titanium surgical clips, absorbable suture, or LigaSure for meticulous control of lymphatic channels to avoid a lymphatic leak.<span style="color:#ff0000">[https://link.springer.com/content/pdf/10.1007/978-1-62703-367-1.pdf]</span>'''
**'''The first landmark in the inguinal node dissection is the saphenous vein[https://pubmed.ncbi.nlm.nih.gov/16643509/]'''
**'''Superficial lymph node dissection'''
***'''Remove lymphatic tissue above the fascia lata[https://pubmed.ncbi.nlm.nih.gov/27717432/]'''
****Fascia lata is continuous with Scarpa fascia superiorly, transitions at inguinal ligament
***'''Majority of the lymph nodes will be found in the central and medial zones[https://pubmed.ncbi.nlm.nih.gov/30730389/]'''
****Anatomic lymph groups (5) by location:
****#'''Central nodes around the saphenofemoral junction'''
****#'''Superomedial nodes''' around the superficial external pudendal and superficial epigastric veins
****##'''Drain the prepuce of the penis and the scrotum'''
****#'''Inferomedial nodes around the greater saphenous vein'''
****#Superolateral nodes around the superficial circumflex vein
****#Inferolateral nodes around the lateral femoral cutaneous and superficial circumflex veins
****In obese patients, it may be easy to overlook the superior medial zone nodal tissue if a prominent suprapubic fat pad is present.
***'''Identify and ligate veins in this area''', which can include (see [https://radiologykey.com/wp-content/uploads/2017/12/978-1-62623-013-2_c001_f006a.tif_epub1.jpg Figure])
****Superficial epigastric vein (drains into the greater saphenous vein proximally) at the superior boundary of dissection
****Superficial circumflex iliac vein (drains into the greater saphenous vein laterally) at the superior boundary of dissection
****External pudendal vein (drains into the greater saphenous vein medially)
****Anterior/lateral accessory saphenous vein (drains into the greater saphenous vein laterally)
***Superior boundary: dissect the fat and areolar tissues to the level of the external oblique fascia, the external inguinal ring, and the exposure of the spermatic cord
****Ligate and divide the first lymphatic packet: a funiculus of lymphofatty tissue, extending from the base of the penis to the superomedial portion of this lymph node packet[https://link.springer.com/content/pdf/10.1007/978-1-62703-367-1.pdf][https://pubmed.ncbi.nlm.nih.gov/21481617/]
****Then from the iliac bone, then from the inguinal ligament (this should expose the femoral vessels)[https://www.youtube.com/watch?v=5HdhCDdDnP0]
*** Inferior boundary: inferior angle of the inguinofemoral exposure at the apex of the femoral triangle
*** Lateral boundary: anterior superior iliac spine (circumflex iliac vessels that can be ligated)[https://www.youtube.com/watch?v=5HdhCDdDnP0]
**'''Identify the Great saphenous vein at the inferior boundary of the femoral triangle'''
***'''Great saphenous vein approaches common femoral vein medially'''
***In standard radical inguinal lymphadenectomy, the great saphenous vein and the lateral saphenous vein are divided at the saphenofemoral junction. However, this increases the risk of lower-extremity complications
***In modified inguinal lymphadenectomy (see below), the Great saphenous vein is spared.
****In patients with minimal metastatic disease, it may be feasible and beneficial to spare the saphenous vein.
***Medial boundary: Dissect medially to identify the aponeurosis of the adductor longus muscle of the thigh
***Lateral boundary: Dissect laterally to identify the aponeurosis of the sartorius muscle [or up to the circumflex iliac vessels
** '''Deep lymph node dissection'''
***'''Enter the fascia lata'''
****'''Overlying the sartorius muscle laterally and medially through the thinner fascia of the adductor longus muscle[https://link.springer.com/book/10.1007/978-1-4939-6679-0]'''
****At the level of the saphenous opening[https://pubmed.ncbi.nlm.nih.gov/30730389/] 
*****Lies 3-4cm below and lateral to the pubic tubercle
*****Transmits the great saphenous vein and other smaller vessels including the superficial epigastric artery and superficial external pudendal artery, as well as the femoral branch of the genitofemoral nerve[https://en.wikipedia.org/wiki/Saphenous_opening]
***'''Identify the femoral artery and vein at the apex of the femoral triangle. Use the femoral vessels to guide the dissection along superiorly[https://pubmed.ncbi.nlm.nih.gov/21481617/]'''
****'''The anterior aspects of the femoral vessels are dissected, but the femoral vessels are not skeletonized, and the lateral surface of the femoral artery is not exposed.[https://pubmed.ncbi.nlm.nih.gov/21481617/]'''
***** '''This avoids injury to the femoral nerve and the deep femoral artery'''
****** '''The femoral nerve is usually not visible as it runs beneath the iliacus fascia lateral to the femoral artery.'''
******Branches of the femoral nerve can be on the lateral border of the femoral artery, which must be preserved.
*****'''Be careful when dissecting over the femoral vessels'''
***'''Continue dissection superiorly along the anterior surface of the femoral vein and the femoral artery working medially to laterally over the femoral vein and artery up to the inguinal ligament''' until the femoral canal is reached where continuity to the pelvic dissection is attained to include the deep inguinal nodes.
****The femoral canal is located medial to the femoral vein below the inguinal ligament
****Superficial cutaneous perforating arteries are ligated as they are encountered on the surface of the femoral artery.
***'''Use both blunt and sharp dissection to resect the deep inguinal nodes.'''
****The deep nodes are typically no more than 3–5 lymph nodes contained within the femoral sheath[https://pubmed.ncbi.nlm.nih.gov/30730389/]
*****The node of Cloquet is the most proximal in the femoral canal and considered the margin between the inguinal and pelvic lymph nodes[https://pubmed.ncbi.nlm.nih.gov/30730389/]
******Cloquet’s lymph node is removed.
***'''Clip and transect specimen at the level of the femoral canal'''
**'''Send intraoperative frozen section of lymph node packet'''
***Intraoperative frozen section has been shown to have diagnostic value in determining the need to proceed to a radical dissection[https://pubmed.ncbi.nlm.nih.gov/30730389/]
***It may be time-saving to proceed to the contralateral dissection while awaiting frozen section results.
*'''Apply sartorius flap, if needed, for''' '''coverage over the femoral vessels and nerves'''
**'''If a deep dissection, the sartorius muscle can be transposed or rolled 180 degrees medially by releasing its attachments from the anterior superior iliac spine, providing myocutaneous coverage over the femoral vessels and nerves'''
***The sartorius flap is sutured to the inguinal ligament superiorly with interrupted 2-0 Vicryl sutures, and its margins are sutured to the muscles of the thigh immediately adjacent to the femoral vessels[https://pubmed.ncbi.nlm.nih.gov/21481617/]
*'''Closure'''
** '''Irrigate the wound''' 
*** Irrigate aggressively with water or saline using a bulb syringe to remove small clots and uncover a potential bleeding source.[https://pubmed.ncbi.nlm.nih.gov/18762945/]
** '''Insert multiperforated closed-suction drains (10 or 15 French)''' 
*** Place drains under the subcutaneous tissue in the dissected area along the femoral vascular axis[https://www.sciencedirect.com/science/article/pii/S1878788623000292] and bring the drains out inferiorly, to prevent lymphocele formation.
** Primary closure of the inguinofemoral dissection is usually possible with minimal or no further mobilization of the excision margins.
*** When circumstances demand a large area of inguinal soft tissue sacrifice, primary closure may be obtained by scrotal skin rotation flaps an abdominal wall advancement flap or a myocutaneous flap based on the rectus abdominis or tensor fasciae latae for more extensive defects.
** Suture skin flips to the surface of the exposed musculature to decrease dead space.
***This can minimize the risk of a postoperative fluid collection (i.e., seroma) that may serve as a potential source for infection.
**Reapproximate subcutaneous tissues with 2-0 Vicryl
**Reapproximate skin with 3-0 non-absorbable suture or skin staples[https://www.sciencedirect.com/science/article/pii/S1878788623000292]
**Apply dressings
=== Modified complete inguinal lymphadenectomy ===
'''Advantage'''
*'''Less morbidity than standard radical inguinal lymphadenectomy'''

==== Key aspects of the procedure (5): ====
# '''<span style="color:#ff0000">Shorter skin incision</span>'''
# '''<span style="color:#ff0000">Limiting dissection by excluding the areas (2)</span>'''
##'''<span style="color:#ff0000">Lateral to the femoral artery[https://link.springer.com/content/pdf/10.1007/978-1-62703-367-1.pdf]</span>'''
##* Lateral limit of dissection is femoral artery modified dissection, compared to sartorius muscle in standard inguinal lymphadenectomy
##'''<span style="color:#ff0000">Caudal to the fossa ovalis[https://pubmed.ncbi.nlm.nih.gov/30730389/]</span>'''
###Also known as the saphenous opening[https://en.wikipedia.org/wiki/Saphenous_opening]
###An oval opening in the upper mid part of the fascia lata of the thigh
###Allow the passage of the great saphenous vein
###Lies 3–4 cm below and lateral to the pubic tubercle and is about 3 cm long and 1.5 cm wide.
# '''<span style="color:#ff0000">Preservation of the saphenous vein[https://pubmed.ncbi.nlm.nih.gov/30730389/]</span>''' and lateral accessory saphenous vein[https://www.youtube.com/watch?v=5HdhCDdDnP0]
##Superficial epigastric and superficial circumflex veins are ligated at the superior boundaries of dissection[https://www.youtube.com/watch?v=5HdhCDdDnP0]
##Superficial epigastric, superficial circumflex veins, external pudendal veins are ligated at the superior boundaries of dissection[https://www.youtube.com/watch?v=5HdhCDdDnP0]
# '''<span style="color:#ff0000">Elimination of the need to transpose the sartorius muscle[https://pubmed.ncbi.nlm.nih.gov/30730389/]</span>'''
# '''<span style="color:#ff0000">Thicker skin flaps</span>'''

==== Indications ====
*'''<span style="color:#ff0000">Clinically node-negative disease (not palpable on physical exam) but increased risk for inguinal metastasis based on primary tumor characteristics (pT ≥2, presence of vascular or lymphatic invasion, or grade ≥3).</span>'''

==== Boundaries of Dissection[https://pubmed.ncbi.nlm.nih.gov/16643509/ §] ====
* '''<span style="color:#ff0000">Superior: inguinal ligament/superior boundary of the external oblique aponeurosis and the spermatic cord</span>'''
**'''<span style="color:#ff0000">Inguinal ligament is the portion of the external oblique aponeurosis which extends between the anterior superior iliac spine and the pubic tubercle as a thick band, folded inward[https://en.wikipedia.org/wiki/Aponeurosis_of_the_abdominal_external_oblique_muscle]</span>'''
* '''<span style="color:#ff0000">Medial: anterolateral border of adductor longus muscle</span>'''
* '''<span style="color:#ff0000">Lateral: saphenous vein and femoral vein</span>[https://pubmed.ncbi.nlm.nih.gov/16643509/]'''
* '''<span style="color:#ff0000">Inferior: fossa ovalis (where the saphenous penetrates the fascia lata to drain into the common femoral vein)[https://www.youtube.com/watch?v=5HdhCDdDnP0]</span>'''
*'''<span style="color:#ff0000">Floor: pectineus muscle for deep dissection (fascia lata for superficial)</span>'''
**Note that adductor longus and sartorious are posterior to fascia lata and are therefore not the relevant medial and lateral boundaries for superficial dissection.
*'''Contemporary modified ILND should include the central and superior zones of the inguinal region[https://pubmed.ncbi.nlm.nih.gov/21481617/] and the deep inguinal nodes'''
==== Step by step ====

*'''Similar to standard inguinal lymph node dissection with the following adjustments'''
** '''Incision: 10-cm skin incision is made ≈1.5-2 cm below the inguinal crease extending from just lateral to the femoral artery to the area of the adductor longus muscle[https://pubmed.ncbi.nlm.nih.gov/30730389/][https://pubmed.ncbi.nlm.nih.gov/21481617/]'''
* The saphenous vein is identified and preserved, although a number of branches draining into it will need to be sacrificed.
*'''Modified dissection should be converted to a radical inguinal lymphadenectomy if positive inguinal lymph nodes are present on frozen section[https://link.springer.com/book/10.1007/978-3-319-60858-7]'''

=== Post-operative care ===
* '''Compression stockings, sequential compression devices, early ambulation, and physical therapy are strongly advised immediately after surgery[https://pubmed.ncbi.nlm.nih.gov/18762945/]'''
**Bed rest for 2 or 3 days is only used if myocutaneous or other large skin flap is used.
** Efforts to minimize lymphedema during the initial postoperative period include applying thigh-high elastic wraps or stockings and elevating the foot of the bed.
**Fitted stocking should be after ILND worn when the patient is ambulatory to maintain lower extremity volume. Patients are then assessed at 6 months and given a trial period without the devices. If leg volume increases (assessed by girth measurements) patients are recommended to wear compressive garments on a chronic basis and consulted to lymphedema specialists for massage therapy'''[https://pubmed.ncbi.nlm.nih.gov/18762945/]'''
*Wound site is kept clean and dry
**In obese patients, dry gauze is often placed in the groin crease to prevent excessive moisture and prevent fungal overgrowth.[https://pubmed.ncbi.nlm.nih.gov/18762945/]
* '''Closed-suction rains are removed after when drainage is <30-50 mL/day for consecutive days which typically occurs 3–17 days following surgery<span style="color:#ff0000">[https://link.springer.com/content/pdf/10.1007/978-1-62703-367-1.pdf]</span>'''
**An oral suppressive dose of a cephalosporin can be continued until drains have been removed to assist in sterilizing the port of  potential entry for bacteria.[https://pubmed.ncbi.nlm.nih.gov/18762945/]
*Sutures and/or staples are removed on Day 15[https://www.sciencedirect.com/science/article/pii/S1878788623000292]
=== Adverse Events ===
* '''<span style="color:#ff0000">Wound infection</span>'''
*'''<span style="color:#ff0000">Skin flap necrosis</span>'''
*'''<span style="color:#ff0000">Wound dehiscence</span>'''
*'''<span style="color:#ff0000">Hemorrhage</span>'''
* '''<span style="color:#ff0000">Seroma or lymphocele</span>'''
* '''<span style="color:#ff0000">Lymphedema, debilitating lymphedema</span>'''
* '''<span style="color:#ff0000">DVT</span>'''
* '''<span style="color:#ff0000">Sepsis</span>'''
*'''Complication rates reported to be as high as 50%[https://link.springer.com/book/10.1007/978-3-319-60858-7]'''
**'''Methods to reduce complications (4)'''
**#'''Meticulous usage of clips, instead of electrocautery, to ligate lymphatic channels'''
**#'''Inguinal pressure dressings'''
**#'''Antibiotic regimens'''
**#'''Stockings'''
*'''Strong risk factor for complications is palliative indication for ILND'''[https://pubmed.ncbi.nlm.nih.gov/11912379/ §]