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Image Number 509 (Sarcoidosis)

 
Morphology:
Annular

Diagnosis: Sarcoidosis

Site: Forehead

Sex: M

Age: 24

Type: Clinical and Histology

Description: Annular nonscaly plaque

Submitted by: Ian McColl

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Differential Diagnosis

History: Cutaneous sarcoidosis can be the presenting feature of a serious systemic disease.Forehead lesions are often annular like this but may also be scaly.Sarcoidosis is a great mimic of other diseases and can present as papules,plaques,nodules,subcutaneous nodules,infiltrates in scars,erythroderma,ichthyosiform,hypopigmentation and scalp alopecia.The lesions are usually asymptomatic.Biopsy shows the characteristic naked tubercle made up of epitheliod histiocytes and some Langhans giant cells.

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