All of the following childhood tumours cause proptosis except: September 2009
**Core Concept**
Proptosis, a bulging of the eye anteriorly, can be caused by various conditions, including orbital tumors. Childhood tumors can be categorized into several types based on their origin and histopathological features.
**Why the Correct Answer is Right**
The question requires the identification of the childhood tumor that does not cause proptosis. Rhabdomyosarcoma, a type of soft tissue sarcoma, is a common orbital tumor in children that can cause proptosis due to its location in the orbit. Neuroblastoma is a malignant tumor that arises from the neural crest and can cause proptosis due to its metastasis to the orbit. Malignant melanoma is a rare tumor in children that can also cause proptosis.
**Why Each Wrong Option is Incorrect**
**Option A:** Rhabdomyosarcoma causes proptosis due to its location in the orbit.
**Option B:** Neuroblastoma can metastasize to the orbit and cause proptosis.
**Option C:** Malignant melanoma is a rare orbital tumor in children that can cause proptosis.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that proptosis can be a presenting feature of various childhood tumors, including rhabdomyosarcoma, neuroblastoma, and malignant melanoma.
**Correct Answer:** C. Meningioma is the correct answer, not listed in the options, however Meningioma's are not typically associated with proptosis in children, but rather other options listed are more common.