Plastic Surgery>>>>>Cutaneous malignancy and sarcoma
Question 4#

Which is not a tumour known to commonly arise from a sebaceous (organoid) naevus? 

a. Basal cell carcinoma (BCC)
b. Tricholemmoma
c. Mycosis fungoides
d. Squamous cell carcinoma (SCC)
e. Syringocystadenoma papilliferum

Correct Answer is C

Comment:

Mycosis fungoides. This is not a tumour known to commonly arise from a sebaceous naevus. BCC is the most common malignant tumour, but benign tumours such as tricholemmoma, trichoblastoma and syringocystadenoma are much more common. Mycosis fungoides is a cutaneous T-cell lymphoma and is unrelated. Older series suggested malignant potential to be 10-15%, but more recent series suggest this rate is much lower. The tumours arise in adolescence or early adult life but can occur in children under 5 years.