SP Partial Nephrectomy

Partial nephrectomy

Removal of the renal tumor with a margin of healthy tissue while preserving the remainder of the kidney.

Why is partial nephrectomy called nephron-sparing surgery?

Because it preserves functioning kidney tissue rather than removing the entire kidney.

Radical nephrectomy

Removal of the entire kidney, typically with Gerota’s fascia and perinephric fat; the adrenal gland and lymph nodes may also be removed at the surgeon’s discretion.

Primary benefit of partial nephrectomy

Preservation of kidney function, with a reduced chance of chronic kidney disease and a lower rate of cardiac events.

Common indications for partial nephrectomy

A solitary kidney, bilateral lesions, compromised kidney function, or a tumor smaller than 7 cm.

Kidney function

The kidneys filter waste from the blood and produce urine.

Ureter

The structure that carries urine from the renal pelvis to the bladder.

Adrenal gland

An endocrine gland located above the kidney whose function is separate from kidney function.

Peritoneum

The membrane lining the abdominal cavity; the kidneys are located behind it.

Retroperitoneal

Located behind the peritoneum.

Renal capsule

The tissue layer directly covering the kidney.

Perinephric fat

Fat surrounding the kidney within the renal fascia.

Renal fascia or Gerota’s fascia

The fascial layer surrounding the kidney and perinephric fat.

Psoas muscle

A key posterior anatomical landmark used during retroperitoneal kidney access.

Renal hilum

The region containing the renal artery, renal vein, and renal pelvis.

Renal artery

The vessel carrying oxygenated blood to the kidney for filtration.

Renal vein

The vessel carrying filtered blood away from the kidney.

Renal pelvis

The urine-collecting region of the kidney that continues into the ureter.

Renal cell carcinoma

The most common type of kidney cancer, accounting for about 85% of diagnoses according to the presentation.

Stage I renal cell carcinoma

A tumor smaller than 7 cm that remains limited to the kidney.

Stage II renal cell carcinoma

A tumor larger than 7 cm that remains limited to the kidney.

Stage III renal cell carcinoma

Cancer that has spread beyond the kidney to surrounding structures, renal vessels, or lymph nodes.

Stage IV renal cell carcinoma

Cancer that has spread beyond Gerota’s fascia, potentially with lymph-node involvement or metastasis.

Exophytic tumor

A tumor that grows outward from the kidney surface.

Endophytic tumor

A tumor that grows inward into the kidney parenchyma and may be harder to locate.

Suggested characteristics for initial robotic partial nephrectomy cases

BMI below 30, low perinephric fat, small cortical tumor, posterior location, and exophytic growth.

Transperitoneal approach

Access to the kidney through the abdominal or peritoneal cavity.

Retroperitoneal approach

Direct access to the kidney through the space behind the peritoneum.

Which tumors are ideally suited for retroperitoneal access?

Posterior or lateral renal masses, particularly those in the middle or upper pole.

Major advantage of retroperitoneal access

Direct access to the kidney and renal artery without requiring colon mobilization.

When may retroperitoneal access help despite an anterior or medial tumor?

When prior abdominal surgery or pathology creates significant intra-abdominal scarring or adhesions.

Relative contraindications to retroperitoneal access

Previous retroperitoneal surgery or percutaneous procedures, highly complex tumors, and anatomical variations.

Open partial nephrectomy ischemia method

The renal vessels are clamped, and ice slush may be used to produce cold ischemia and protect the kidney.

Minimally invasive partial nephrectomy ischemia method

The renal vessels are commonly clamped without ice slush, producing warm ischemia.

Warm ischemia

Interruption of kidney blood flow without cooling the kidney.

Purpose of clamping the renal vessels

To control blood loss while the tumor is excised and the kidney is repaired.

Warm ischemia limit stated in the presentation

A maximum clamp time of 30 minutes was described as the generally accepted limit before permanent kidney damage.

How is the tumor boundary identified?

Using visual appearance, preoperative CT imaging, and intraoperative ultrasound.

How does the surgeon confirm complete tumor removal?

The tumor is removed with a healthy tissue margin, and pathology assesses whether the margins are clear.

Positive surgical margin

Tumor cells are present at the edge of the removed specimen, suggesting that cancer may remain.

Purpose of intraoperative ultrasound

To identify the tumor boundary and determine how deeply the tumor extends into the kidney.

SP low anterior access incision

A single incision approximately 3.5 cm long.

Gas used to establish the working space

Carbon dioxide, or CO2.

Recommended SP camera orientation for low anterior access

Camera below, because the approach requires anterior retraction.

Primary SP instruments described for the procedure

Maryland bipolar forceps, fenestrated bipolar forceps, monopolar curved scissors, and needle drivers.

Why are two bipolar instruments useful?

They provide flexibility when responding to bleeding.

Bulldog clamp function

Temporary occlusion of renal blood flow during tumor excision and kidney repair.

Renorrhaphy

Suturing and reconstruction of the kidney after the tumor is removed.

Main SP limitation compared with multiport surgery

Reduced retraction range and strength, particularly for vertical and lateral retraction.

Potential patient benefits of low anterior access

Shorter length of stay, lower postoperative pain and opiate use, less muscular trauma, and a focused working space.