Extraosseous Aneurysmal Bone Cyst at Hypothenar Area in an Adult Male- A Case Report

Abstract

Aneurysmal Bone Cyst (ABC) is a benign tumour of bone which develops most frequently in the metaphysis of long bones and the posterior elements of vertebral bodies. The ABC generally occurs during the first two decades of life and has a slight predilection for the female sex. Radiographically, ABC is usually eccentric, lytic and expansile with well defined margins. Soft tissue or extra osseous ABC is extremely rare in occurrence, with only few case reports found in literature. Extraosseous ABC is usually found in soft tissues of lower limb and arm. Its occurrence in soft tissue of hands is extremely rare. Hereby, authors reported a case of a 30-year-old male patient who had swelling of approximately 9×6 cm in hypothenar area of left hand starting proximally from the wrist crease and extending distally till distal palmar crease and from the ulnar border of the palm till the mid palmer area. Authors described this case to highlight this entity, at an uncommon location (hypothenar area of palm) and importance of excisional biopsy in such cases.