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Medullomyoblastoma with calcification: a case report.

Sujata Chaturvedi¹, Sanjeev Gupta, Shweta Singhal

¹Department of Pathology, Institute of Human Behavior and Allied Sciences, Delhi, India. cvsujata@hotmail.com

Neuropathology : Official Journal of the Japanese Society of Neuropathology

|January 10, 2008

Summary

Medullomyoblastoma, a rare cerebellar tumor with muscle cells, was found in a 9-year-old boy. This case highlights unique imaging and histological findings, including calcifications.

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Area of Science:

Pediatric Oncology
Neuro-oncology
Developmental Biology

Background:

Medulloblastoma is a common malignant brain tumor in children.
Medullomyoblastoma is an extremely rare subtype characterized by a striated muscle component.
Embryonal cerebellar neoplasms require precise classification for effective treatment.

Observation:

A 9-year-old boy presented with symptoms of increased intracranial pressure and truncal ataxia.
Magnetic Resonance Imaging (MRI) revealed a well-defined cerebellar vermis mass compressing the fourth ventricle.
The mass exhibited heterogeneous intermediate signal intensity on MRI.

Findings:

Surgical resection confirmed a tumor composed of undifferentiated neuroectodermal cells and desmin-positive myogenic cells with striations.

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The MIB labeling index was 8% in neuroectodermal cells, with no proliferation noted in myogenic components.

Uncommon findings included areas of calcification and psammoma bodies within the tumor.

Implications:

This case expands the understanding of medullomyoblastoma's diverse histological and imaging features.
Recognizing rare presentations like calcifications is crucial for accurate diagnosis.
Further research into the developmental origins and therapeutic targets for medullomyoblastoma is warranted.