Eyelids/Orbit/Optic Nerve Flashcards
An incision through the gray line of the eyelid margin between what and what?
Orbicularis and the tarsus
What is acanthosis?
Increased thickness of stratum malpighii of the epidermis
What is hyperkeratosis?
Increased thickness of the stratum corneum of the epidermis
What is parakeratosis?
Retention of nuclei within the stratum corneum
What is dyskeratosis?
Premature individual cell keratinization
What is acantholysis?
Loss of cohesion between adjacent epithelial cells.
What is the inheritance and sssociations of distichiasis?
AD
- Mandibulofacial dystosis
- Tisomy 18
What is a Zimmerman tumor?
Aberrant location of lens epithelium within the inferonasal porition of the lower eyelid
Muir-Torre syndrome is s/w what on the eyelid?
Its a visceral carcinoma - usually of the colon; Keratoacanthoma, sebaceous neoplasm;
What is the cutaneous horn form of seborahhic keratosis?
Inverted follicular keratosis
What is a Spitz nevus?
Develop late in childhood and are uncommon after the second decade. They are larger - up to 1.0 cm - and have a pink-red color.
What are the 2 primary neoplasms of the orbit?
- Hemangioma
2. Lymphoma
How does a pleomorphic adenoma look histologically?
A mixture of epithelial and stromal elements and may contain heterologous elements such as cartilage and bone
Lymphangiomas are encapsulated?
FALSE
Hemangiopericytoma histologically looks?
Staghorn vascular pattern;
reticulin stain - useful in demonstrating tumor cells that are individually wrapped in a network of collagenous material
In rhabdomyosacroma embroynal type what do you see histololgically?
Cross striations
What are the two types of cells seen in a schwannoma?
- Antoni A - spindle cells arranged in interlacing cords that may form Verocay bodies
- Antoni B - made up of stellate cells with mucoid stroma
Rosenthal fibers are found in what?
ON gliomas - deeply eosinophilic filaments
Where do Optic nerve menigomas arise?
Arachnoid. They may invade the nerve and extend through the dura mater to invade muscle.
Psammoma bodies are found in what?
Optic nerve menigiomas with WHORLS.
Parakeratosis is characteristic of what lesion and define it?
Actinic keratosis; retention of nuclei in the keratin layer and epidermis lacks the granular layer
What has a fibrovascular core with chronic inflm with epidermal frond and hyperkeratosis?
Squamous papilloma
What does a seborrehic keratosis look like?
hyperkeratosis with pseudo-horn cyst
What does syringoma look like?
Tad pole ductles
