Mohs Surgery Flashcards
what is the formula for calculating the area of a circle?
3.14 x Radius squared
In a sharply demarcated lesion of .6 to 1.9 cm of BCC or SCC what margin gives 95% clearance?
4mm
In a poorly defined lesion of .6 to 1.9cm of BCC or SCC what margin gives 95% clearance?
5mm
For Basal and SCC what area is high risk independent of tumor size?
Area H
Ankles fall in what area
Area H
nipples fall in what area
Area H
Genitalia fall into what area
Area H
Sebaceous carcinoma of .5 cm on chest does this met Mohs criteria?
Yes, any size all areas HM and L
Angiosarcoma has appropriate use criteria in what areas
None. It is uncertain in all areas
What areas can you treat bowenoid papulosis by Mohs
No appropriate use criteria for bowenoid papulosis
Where can you treat Desmoplastic Trichoepithelioma by Mohs.
Uncertain H and M no in L
Can you treat a Merkel cell carcinoma on the arm by Mohs.
It is uncertain in that location. Everywhere else yes
Of the following which can be treated by Mohs any size any HML location.
Extramammary paget’s disease
DFSP
Atypical Fibroxanthoma
all of them
what are three features of cautery artifact
spindled nuclei
palisading
separation of the epi and basement membrane
If you have bcc enter the orbital fat pad with BCC what should you do?
Stop, order MRI (soft tissue involvement) and CT (bony involvement) consult with radiation oncology and oculoplastics
Under what circumstances is it appropriate to use Mohs surgery in treating a superficial BCC in area L
There are no indications for treating superficial BCC by Mohs surgery in area M.
What is chatter in a Mohs section.
alternating thick and thin sections in the cut which can be parallel or perpendicular to the cutting edge.
List 7 reasons for chatter in a Mohs section.
- block only unevenly frozen
- cutting speed too fast
- calcification
- dull or nicked blade
- blade clearance to high or tilted
- inadequate tightening of gears or lubrication
- unsteady hand when doing the cut.
Name three scenarios that may increase the risk of floaters that happen in 2% of Mohs cases.
BCC, ulcerated tumors, and within the first layer of Mohs surgery
what component in anesthetics may increase bilirubin in the blood by binding with albumin and displacing the bilirubin, esp in folks with hyperbilirubinemia.
The preservative contains methylparaben which does this action.
How long can buffered lidocaine last in the bottle and remain effective.
2 to 8 weeks
