Following the visualization of the anatomical structures, the nerve block needle will be advanced via the in-plane technique beneath the serratus anterior muscles until the interfascial space was reached. After hydrodissection with 2 ml normal saline, 20 ml 0.25% bupivacaine will be injected into the area.

After the linear ultrasound (US) probe will be placed 2-3 cm lateral to the T5 spinous process, 20 ml of 0.25% bupivacaine hydrochloride will be injected into the interfacial space below the erector spinae muscle, above the transverse process.

Serratus anterior plane block will be performed unilaterally, under US guidance, before the surgical operation, after the induction of anesthesia, when the patient is placed in the lateral decubitus position.

Pain will be assessed at rest and while coughing using the visual analog scale on a scale from 0 (no pain) to 10 (worst pain). Pain assessment will be done at 1st, 2nd, 4th, 8th, 16th and 24th hours after surgery.

Chronic pain findings will be evaluated in the 3rd month and 6th month after surgery by using visual analog from 0 (no pain) to 10 (worst pain). Neuropathic pain symptoms (Burning, stabbing, or electric shock-like pain; tingling, numbness, or a "pins and needles" feeling, hyperalgesia, allodynia and hypoesthesia) will also be asked to the participants in the 3rd month and 6th month after surgery.