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Year : 1999  |  Volume : 47  |  Issue : 3  |  Page : 178--81

Ultrastructural changes in medullomyoblastoma. Similarities with foetal rhabdomyoma.

Department of Neuropathology, Medical Research Centre, Bombay Hospital, Mumbai, 400020, India., India

Correspondence Address:
D K Dastur
Department of Neuropathology, Medical Research Centre, Bombay Hospital, Mumbai, 400020, India.
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Source of Support: None, Conflict of Interest: None

PMID: 10514575

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The light and electronmicroscopic changes are described in two cases of medullomyoblastoma, and compared with the changes seen in a case of foetal rhabdomyoma. The medullomyoblastomas in two children aged 8 and 5 years, consisted predominantly of classical type of medulloblastoma cells, along with few to many 'strap cells' or 'myoid cells' which, on closer examination, showed clear cross striations, consistent with muscle fibres or myofibrils. The primitive myoid cells were similar to those encountered in larger numbers in a post-auricular rhabdomyoma, possibly of foetal origin in a 40 day old infant. The four pathogenetic mechanisms i.e. (i) an embryonal stage of myofibrillar differentiation; (ii) a malformative factor; (iii) a teratoid factor on account of the presence of mesenchyme derived striated muscle tissue in the obviously predominant ectodermal medulloblastoma; and (iv) metaplasia of the vascular smooth muscle cells in the medullomyoblastoma, are discussed.

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Online since 20th March '04
Published by Wolters Kluwer - Medknow