The cornea endothelium is derived from which structure? | OphthalmologyWeb: The Ultimate Online Resource for Ophthalmologists

Thursday, April 17, 2008

The cornea endothelium is derived from which structure?

Neural crest
Endoderm
Mesoderm
Ectoderm

Correct Answer: Neural crest

The corneal endothelium is derived from the neural crest.

For more information on specular microscopes, click here.
For a video presentation by Kevin Corcoran "Medicare Reimbursement for Specular Microscopy", click here.

The patient depicted in the photo was scheduled for a surgical procedure which was aborted at the beginning of the case. The photo was taken 2 weeks after the scheduled surgery. What was the most likely intraoperative event?
1. post injection retrobulbar hematoma
2. infection from nonsterile instruments
3. cautery fire
4. allergic reaction to surgical drapes
check the answer
The CT scan below is most representative of which of the following disease processes?
1. Myositis
2. Thyroid Eye Disease
3. Orbital Cellulitis
4. Orbital Fracture
check the answer
The patient in the photos below is a 45 yo female with complaints of a bulging right eye that has been gradual over the past several years. She denies pain or double vision. Her CT scans are shown below as well as the surgical removal of the tumor. What is the most likely diagnosis?
1. schwannoma
2. cavernous hemangioma
3. capillary hemangioma
4. metastatic breast cancer
check the answer
Which of the following is not a treatment option for capillary hemangioma
1. observation
2. oral steroids
3. surgical resection
4. intralesional steroid injection
5. silver nitrate solution
check the answer
The lesion seen below has been present for many years. The patient does not complain of pain, itching or growth. This is most consistent with:
1. apocrine hydrocystoma
2. basal cell carcinoma
3. chronic dacryocystitis
4. sebaceous cell carcinoma
check the answer

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