Melanoma-simulating nodules due to capillary aneurysms

Area of Science:

• Dermatology
• Pathology
• Vascular Lesions

Background:

• Melanoma is a serious skin cancer requiring prompt diagnosis and treatment.
• Certain benign lesions can clinically resemble melanoma, leading to diagnostic challenges.
• Aneurysmal capillary dilatations with thrombosis are rare conditions that can mimic melanoma.

Purpose of the Study:

• To present cases of capillary aneurysms with thrombosis that clinically simulate melanoma.
• To emphasize the importance of differentiating these benign lesions from malignant melanoma.
• To advocate for a conservative approach in managing suspicious lesions without definitive evidence of malignancy.

Main Methods:

• Clinical presentation and histopathological examination of six cases.
• Review of literature on amelanotic and pigmented lesions mimicking melanoma.
• Analysis of diagnostic criteria for distinguishing benign from malignant lesions.

Main Results:

• Six patients presented with lesions clinically suggestive of melanoma.
• Histopathological examination revealed these lesions were aneurysmal dilatations of capillaries with thrombosis.
• These benign lesions can present as black, flat, growing lesions, mimicking melanoma.

Conclusions:

• Lesions simulating melanoma may arise from aneurysmal capillary dilatation with thrombosis.
• It is crucial to distinguish these benign vascular lesions from malignant melanoma.
• Histological examination is essential to confirm malignancy and guide treatment, avoiding unnecessary tissue sacrifice for benign conditions.