Pilocytic Astrocytoma – Molecular testing to aid histologic diagnosis.

Pilocytic Astrocytoma (PA) characteristically exhibits biphasic morphology featuring densely fibrillar, compact regions alternating with loosely-cohesive microcystic or myxoid areas; the latter is pictured here.  Diagnosis can be difficult, especially on small biopsies, but molecular testing can help.  BRAF-KIAA1549 fusion occurs in about 70% of PAs, whereas BRAF V600E mutation occurs in about 5-10% of PAs. 

Pilocytic Astrocytoma, S16-919, 40x, with poss EGB

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