Malignant melanomas with histologic diameters less than 6 mm

Area of Science:

• Dermatology
• Oncology
• Pathology

Background:

• Malignant melanomas (MMs) with small diameters (<6 mm) are infrequently surgically excised.
• Limited data exists on the specific characteristics of these small melanomas.
• Further research is needed to fully understand and characterize small MMs.

Purpose of the Study:

• To investigate the clinical and histopathologic features of small melanomas.
• To compare the characteristics of small MMs to larger MMs.
• To identify potential differences in clinical presentation and histopathologic findings.

Main Methods:

• Histological measurement of the greatest diameter for 112 consecutively submitted MMs.
• Detailed clinical and histopathologic analysis of lesions with diameters less than 6 mm.
• Evaluation of invasion depth and clinical outcomes.

Main Results:

• Four (3.5%) MMs exhibited small histologic diameters.
• Clinical features of small MMs deviated from the standard ABCD criteria.
• Histopathologic features of small MMs were comparable to larger MMs, with superficial invasion depth.
• Favorable clinical outcomes were observed in small MMs.

Conclusions:

• Small MMs present histopathologically similar to larger MMs but may require alternative clinical diagnostic criteria.
• The superficial invasion depth of small MMs suggests improved outcomes with early detection and removal.
• Increased recognition and timely excision of small MMs could potentially reduce overall mortality rates associated with malignant melanoma.