Gorham-Stout disease is a rare condition characterized by extensive bone loss due to the proliferation of new vascular and lymphatic structures. It can occur in any bone and cause pathologic fractures with poor bone healing. Complications such as effusions and lymphangiomas can also develop. Gorham-Stout disease pathogenesis is still being studied, and treatment options are limited, but sirolimus has shown promise in stabilizing or reducing symptoms.