test yourself on...Chondrodermatitis nodularis
Use our quick quiz to check your clinical knowledge
a GP and dermatology clinical assistant in Kibworth, Leicestershire
1What is chondrodermatitis nodularis helicus chronicus (CDNHC)?
It is a common, benign, painful condition of the helix or antihelix of the ear,
usually presenting as a
single nodule 4-8mm in diameter.
2CDNHC is a disease predominantly of men and rare in women. True or false?
False 10-35 per cent of cases are in women.
3The commonest complaint in people with CDNHC is the pain associated with the nodule.
What are the common precipitating factors?
Trauma, pressure actinic damage and cold (patients typically admit to sleeping on the side of the pain and this along with prominent cartilage seems to be an important aetiological factor).
4What are the differential diagnoses of CDNHC?
Basal cell carcinoma, squamous cell carcinoma, keratoacanthoma and actinic keratoses.
5The right ear is more commonly affected than
True or false?
True, although bilateral CDNHC may occur.
6How can CDNHC be treated?
Preventive measures may help, for example special pillows to reduce pressure, reduction in exposure to cold. Topical steroids ( for inflammation) and antibiotics may help if the condition is infected. Otherwise, surgery is usually required, with incision and trimming of the cartilage below. Despite this further lesions will often develop.
7CDNHC is a disease affecting which age group?
It can occur at any age from 20 onwards though tends to be more common as age increases.