ABSTRACT
Introduction: Pectoralis major Myocutaneous flaps (PMMC) are extensively used for Head, Neck, Face and post mastectomy mammary gland reconstructive surgeries. Pectoralis major is responsible for flexion, adduction and medial rotation of shoulder joint. Its absence may obvious because of compromised movement of shoulder joint or as a part Poland’s syndrome or may be sporadic as seen in our case. Case study: Pectoralis major muscle was completely absent on right side of an adult female cadaver. Result: Complete unilateral agenesis of right Pectoralis major muscle was found in an adult female cadaver during routine undergraduate dissection in the department of Anatomy. Right Mammary gland was lying directly on hypertrophied Pectoralis minor muscle. Discussion: Awareness about absence of Pectoralis major muscle is a must for planning and success of various reconstructive surgeries, flawless interpretation of Radiographs, CT and MRI scans. Unilateral and complete agenesis of Pectoralis major muscle not associated with any other anomaly visible to naked eye as seen in our case is a rare finding and hence needs to be documented.