Analgesic Efficacy of U/S Retrolaminar Block and Erector Spinae Plane Block in MRM

Inclusion Criteria: * Female patients * Type of surgery; Modified Radical Mastectomy (MRM) * Physical status ASA I, II, III. * Age ≥ 18 and ≤ 65 Years. * Body mass index (BMI): \> 20 kg/m2 and \< 35 kg/m2. Exclusion Criteria: * Age \<18 years or \>65 years * BMI \<20 kg/m2 and \>35 kg/m2 * Known sensitivity or contraindication to drug used in the study (local anesthetics, opioids). * History of psychological disorders and/or chronic pain. * Contraindication to regional anesthesia e.g. local sepsis, pre- existing peripheral neuropathies and coagulopathy. * Patient refusal. * Severe respiratory or cardiac disorders. * Advanced liver or kidney disease. * Pregnancy. * Physical status ASA IV and Male patients.