What is the most common cause of proptosis in patients older than 50?

What is the most common cause of proptosis in patients older than 50?

• A. Rhabdomyosarcoma
• B. Lymphoma
• C. Cavernous hemangioma
• D. Thyroid Eye Disease

Answer: (B)

In older adults, the most common cause of proptosis is orbital lymphoma. As people age, the incidence of lymphoid tumors in the orbit increases, making lymphoma a more likely explanation for unilateral or slowly progressive proptosis than other causes. Lymphoma often presents as a gradual, painless proptosis and may involve the intraconal or extraconal space; imaging typically shows a well-defined mass, and definitive diagnosis requires biopsy with histopathology and staging to assess systemic involvement. In contrast, thyroid eye disease tends to affect a broader age range but is more common in middle-aged patients and often causes bilateral proptosis with accompanying lid retraction and motility restriction due to inflammatory enlargement of extraocular muscles. Rhabdomyosarcoma is more characteristic of pediatric patients, and cavernous hemangioma, while a potential cause, is less frequent as the underlying reason for proptosis in the over-50 group compared with lymphoma.

In older adults, the most common cause of proptosis is orbital lymphoma. As people age, the incidence of lymphoid tumors in the orbit increases, making lymphoma a more likely explanation for unilateral or slowly progressive proptosis than other causes. Lymphoma often presents as a gradual, painless proptosis and may involve the intraconal or extraconal space; imaging typically shows a well-defined mass, and definitive diagnosis requires biopsy with histopathology and staging to assess systemic involvement.

In contrast, thyroid eye disease tends to affect a broader age range but is more common in middle-aged patients and often causes bilateral proptosis with accompanying lid retraction and motility restriction due to inflammatory enlargement of extraocular muscles. Rhabdomyosarcoma is more characteristic of pediatric patients, and cavernous hemangioma, while a potential cause, is less frequent as the underlying reason for proptosis in the over-50 group compared with lymphoma.