Bursa of piriformis muscle

Looks like

A small sac between the piriformis tendon and the upper edge of the greater trochanter.

What it does

Reduces friction where the tendon reaches the bone.

Keeping it well

Rarely a separate clinical problem.

Related conditions

• Chronic venous insufficiency
• Gout
• Haemophilia & bleeding disorders
• Lyme disease
• Lymphatic filariasis (elephantiasis)
• Lymphoedema
• Marfan syndrome & connective tissue disorders
• Osteoarthritis
• Polymyalgia rheumatica
• Psoriatic arthritis
• Restless legs syndrome
• Rheumatic fever & rheumatic heart disease
• Rheumatoid arthritis
• Systemic lupus erythematosus
• Temporomandibular joint disorder
• Varicose veins