Orbit Flashcards
What type of cyst is this? And what are the histologic characteristics?
Dermoid cyst of the right orbit. And keratinized stratified squamous epithelium and the wall contain sebaceous glands and adrenal structures.
What inflammatory disorder is this? And what is the characteristic?
Orbital myositis. And the skeletal muscle fibers are surrounded by chronic inflammatory cells.
What are the features demonstrated in these images?
The mixture of inflammatory cells and the bundle of collagen and fibrosing orbititis.
What is this eye condition? And what are the features demonstrated?
Thyroid eye disease. Asymmetric proptosis and eyelid retraction and fusiform enlargement of the extraocular muscles.
What type of cells are these?
Mononuclear inflammatory cells.
What is this condition? And what does the microscopic section shows?
Aspergillus infections of the orbit and branching fungal hyphae on silver stains.
What type of tumor is this? And what are the demonstrated features?
Pleomorphic adenoma of the lacrimal gland. And neoplastic epithelial elements and the fibromyxoid stroma.
What type of tumor are these? And what is the characteristic?
Adenoid cystic carcinoma of the lacrimal gland and cribriform (“Swiss cheese”) appearance.
What type of lymphoma are these? And what are the features demonstrated?
Low-grade B-cell lymphoma of the orbit. Vague follicular arrangements of lymphocytes, a lymphoid follicle with a germinal center, and Dutcher bodies.
What is this condition? And what is the characteristic demonstrated in the CT scan?
Orbital lymphatic malformation. And a multilobulated mass within the left orbit.
What do the histologic images demonstrate?
Numerous vascular channels with lymphoid follicles and endothelial-lined vascular channels.
What type of hemangioma is this? And what is the characteristic?
Cavernous hemangioma. And filled with large blood-spaces separated by thick septa.
What type of tumor is this? And what are the characteristics?
A solitary fibrous tumor (hemangiopericytoma). And branching vascular (staghorn) pattern and oval to spindle-shaped vesicular nuclei.
What type of orbital tumor is this? And what is the pattern?
Fibrous histiocytoma and storiform (matlike or whorly) pattern.
What type of orbital tumor is this? And what is the characteristic?
Rhabdomyosarcoma and a large poorly circumscribed orbital tumor and proptosis.
What do the arrows indicate?
Cross-striations and fibrous septa.
What is this condition? And what are the features noted?
Plexiform neurofibroma and thickened, tortuous nerves with a proliferation of endoneurial fibroblasts and Schwann cells.
What are the pattern and characteristics of the cells? And what does the asterisk indicate?
Antoni A pattern, spindle cells are packed together and Antoni B pattern consists of loosely arranged, mucoid stroma. And Verocay body.
What is this condition? And what is the characteristic?
Fibrous dysplasia and bony trabeculae are C-shaped in appearance.
What is this condition? And what do the arrows indicate?
Fibro-osseous dysplasia and osteoblasts.
