AANP

The @neuropathology poster walk at #USCAP2026 was a great success! It was wonderful to see all of the #neuropath representation and connect with colleagues.

The correct diagnosis is Ewing sarcoma, which was confirmed by detection of the EWSR1::FLI1 fusion transcript. Please visit the AANP website for full case discussion! aanp.memberclicks.net

⭐️AANP Case of the Month⭐️ Credit: @JaredAhrendsen 5yo p/w large, variably enhancing frontal mass. There is no evidence of extracranial disease. Resection reveals histomorphology shown here. What is your differential diagnosis? Which IHC/stains would you order? #neuropath

We had a wonderful AANP Companion Society Meeting this morning at #USCAP2026! The Fellowship Fair was another huge success! Don't forget to join us again tomorrow Monday 3/23 at 9:45am for a Poster Walk starting at poster #366!

About to start the AANP Companion Society meeting at #uscap2026 Come join us in room 303B! @neuropathology @TheUSCAP

The American Association of Neuropathologists will be represented at #USCAP2026, March 21-26, 2026, in San Antonio, Texas, through the following events. If you’re planning to attend, please join!

Mark your calendar and don’t miss it! Join Dr. Melissa Blessing for the next AANP Teaching Rounds on Monday, March 30! aanp.memberclicks.net/2026teachingro….

The differential for this malignant small round blue cell tumor is broad, including CNS embryonal neoplasms and poorly differentiated sarcomas. Representative IHCs are shown. What is the most likely diagnosis? What molecular finding(s) do you expect to be present in this tumor?

HGG-F (Adult-type diffuse high-grade glioma, IDH-subtype F) an emerging new type of high-grade glioma, often with a gliomatosis-like pattern. Interestingly, they seem to have a better prognosis compared to Glioblastoma. #neuropath #neuropathology #pathx #PathTwitter

Don’t forget to join the AANP Teaching Rounds at 12 pm ET today! aanp.memberclicks.net/2026teachingro….

For complete case discussion, including prior months’ case, please visit: neuropath.org/case-of-the-mo…

The ddx is broad: meningioma, solitary fibrous tumor, other CNS mesenchymal lesions, and metastatic sarcoma. Useful IHC/stains shown here suggest a CNS mesenchymal tumor. Final diagnosis of intracranial mesenchymal tumor, FET::CREB fusion-positive, was confirmed by molecular.

⭐️AANP Case of the Month⭐️ Credit: Dr. Purvi Patel, MD, PhD 66F p/w seizure. MRI: left frontal extra axial mass. Based on the images shown, what is your DDX? What stains would you order? Likely molecular alteration? #neuropath

@DrCycloPath @CytoAtlas C

🔬 #CytoQuiz #GUPath A) Chromophobe Renal Cell Carcinoma B) Clear Cell Renal Cell Carcinoma C) Papillary Renal Cell Carcinoma D) Adrenocortical Carcinoma

It was an honor to present at the pediatric #neuropathology workshop (@The_AAFS) with this group of fantastic pathologists! #neuropath #4n6 🧠🔬

Be sure to check out the AANP website for additional education and neuropathology related content, including previous “Case of the Month” reports! neuropath.org/case-of-the-mo…

Registration for the 2026 AANP Annual Meeting is now open! Please utilize the link to register today #pathx #PathTwitter #neuropath #neuropathology #pathology aanp.memberclicks.net/2026aanpannual…

Make sure to visit the AANP website for additional educational content, including full write ups for this and prior months’ posts! neuropath.org/case-of-the-mo…

⭐️AANP Case of the Month⭐️ Credit: Dr. Dimitri Trembath, MD, PhD 52F p/w worsening HA, visual disturbance, and ataxia. MRI brain reveals an enhancing extra axial mass at the CP angle. Histology shown. DDX? Useful IHC? Likely molecular alterations? #neuropath

This is a chordoid meningioma, with a differential dx including chordoma (esp at/near the skull base). Meningioma markers (EMA+, PR+) help to differentiate from chordoma (bracyury+, S100+)