Multiple pilomatricomas: cutaneous marker for myotonic dystrophy.

Area of Science:

• Dermatology
• Genetics
• Oncology

Background:

• Pilomatricoma (calcifying epithelioma of Malherbe) is a benign neoplasm originating from hair matrix cells.
• Pilomatricomas typically present as solitary, firm, asymptomatic nodules on the head, neck, or upper extremities.
• Activating mutations in the beta-catenin gene (CTNNB1) are common in pilomatricomas, activating the WNT signaling pathway and driving tumorigenesis.

Observation:

• This report details an unusual case of multiple pilomatricomas (MPs) in a patient diagnosed with myotonic dystrophy.
• The occurrence of multiple pilomatricomas preceded the overt clinical manifestations of myotonic dystrophy in this patient.

Findings:

• Multiple pilomatricomas can be associated with myotonic dystrophy.
• The genetic mutations leading to pilomatricoma formation may also be linked to the pathogenesis of myotonic dystrophy.

Implications:

• Multiple pilomatricomas may serve as an early cutaneous sign for identifying individuals with myotonic dystrophy.
• Early detection through cutaneous markers could facilitate timely diagnosis and management of myotonic dystrophy.
• This association warrants further investigation into the shared molecular pathways between pilomatricomas and myotonic dystrophy.