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Rudimentary meningocele of the scalp
Y Mihara1, T Miyamoto, Y Hagari
1Department of Dermatology, Faculty of Medicine, Tottori University, Yonago, Japan.
Abstract:
A rudimentary meningocele, a variant of primary cutaneous meningioma, was seen on the scalp of a 9-month-old Japanese boy. Clinically, the lesion on the left parietal area was round, about 1.6 cm in diameter, alopecic, and slightly elevated. Histologically, the lesion, located from the dermis to the subcutis, consisted of scattered foci of meningothelial cells, an anastomosing network of empty spaces with psammoma bodies and collagen bodies, and small vessels. Immunohistochemically, the meningothelial cells were positive for vimentin and desmin. Ultrastructurally, they had elongated cytoplasmic processes, intermediate filaments in the cytoplasm, and desmosomal junctions.
Insights
A rare rudimentary meningocele, a type of primary cutaneous meningioma, was identified on a baby's scalp. This benign scalp tumor in infants requires careful diagnosis and monitoring.
Area of Science:
- Dermatology
- Pediatric Oncology
- Pathology
Background:
- Primary cutaneous meningiomas are rare tumors originating from ectopic meningothelial cells in the skin.
- Rudimentary meningoceles represent a specific variant, often presenting in infants.
Observation:
- A 9-month-old Japanese boy presented with a 1.6 cm, round, alopecic, and slightly elevated lesion on the left parietal scalp.
- The lesion extended from the dermis to the subcutis.
Findings:
- Histopathology revealed scattered meningothelial cells, vascular networks, psammoma bodies, and collagen bodies.
- Immunohistochemistry confirmed meningothelial cell markers (vimentin, desmin).
- Ultrastructural analysis showed characteristic features of meningothelial cells.
Implications:
- This case highlights the importance of recognizing rudimentary meningoceles in pediatric dermatology.
- Accurate histological and immunohistochemical characterization is crucial for differentiating from other scalp lesions.
- Understanding the benign nature and specific features aids in appropriate clinical management.