Eczematous malignant melanoma: a wolf in sheep's clothing.
BACKGROUND
The clinical diagnosis of amelanotic melanoma is still a challenge.


METHODS
A 72-year-old patient was first referred to us for the excision of a melanoma of the chin. In the first examination, we discovered another melanoma of the trunk. Both malignancies were excised and histopathology confirmed the clinical diagnosis of melanomas with Clark level II and III, respectively. Apart from these melanomas, physical examination revealed an 8 cm x 5 cm large erythematous plaque on the left upper arm. We first thought of a common eczema or a superficial mycosis; a cutaneous T cell lymphoma (CTCL) was considered as well. Surprisingly, the pathology report showed typical features of a malignant melanoma. The diagnosis was confirmed by 3 further punch biopsies (Clark level III, Breslow 0.6 mm). The lesion was excised with 1-cm safety margins.


CONCLUSIONS
Amelanotic melanoma may appear as an erythematous macula or plaque; clinical symptoms are erythema, edema, pruritus or a slow increase in size and hypopigmentation or discoloration. Only a biopsy can determine the etiology of a non-specific lesion.
Department of Dermatology, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany.
Cornelius
C
Mensing
Elisabeth
E
Livingstone
Thomas
T
Schwarz
Axel
A
Hauschild
D000368:Aged; D003937:Diagnosis, Differential; D004485:Eczema / Q000175:diagnosis* / Q000209:etiology* / Q000628:therapy; D006801:Humans; D008297:Male; D008545:Melanoma / Q000150:complications* / Q000175:diagnosis* / Q000628:therapy; D012878:Skin Neoplasms / Q000150:complications* / Q000175:diagnosis* / Q000628:therapy