American Registry of Pathology Press

01/06/2026

New year, new fascicle to show off! From our new series 5 fascicle "Non-Neoplastic Disorders of the Skin" (arppress.org/books/book/70):
Perforating folliculitis is the transepidermal elimination of the hair follicle (+/- collagen or elastic fibers), which presents as pruritic umbilicated papules and plaques.

12/29/2025

More from arppress.org/books/book/69:
Malignant melanotic nerve sheath tumor (MMNST; previously called melanotic schwannoma) has a propensity to arise in association with spinal roots and ganglia, and consists of spindle to epithelioid cells arranged in sheets or lobules with variable melanin accumulation.

12/29/2025

LAST CHANCE to use those remaining 2025 budgets!! 🔬

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Prefer Print? ✅ 30% OFF Individual Fascicles 🎟️ Use code: ARP2025-jkjvutwu 📚 http://arppress.org

⏳ Offer ends December 31st! Don't miss your chance to lock in 2025 rates and equip your practice with the gold-standard reference for the new year.

12/19/2025

Equip your practice for the new year with a full year of ARP Digital Access. Use those remaining 2025 resource budgets and save lock in the 2025 rates + $50 off 🔬

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12/17/2025

More on meningiomas from arppress.org/books/book/69:
Some striking subtypes of meningioma include: psammomatous, angiomatous, and secretory.

12/12/2025

From arppress.org/books/book/69:
Meningiomas are well-circumscribed, extra-axial, dural-based masses, and are the most frequent primary CNS tumors reported (in the US). The prototypical subtype is termed meningothelial and is composed of syncytial cells with overt whorl formation.

12/12/2025

As the year draws to a close and the holiday season is in full swing, we extend our warmest wishes to you and your family. Year-End Sale Alert! Save 30% on All Fascicles Use the code ARP2025-jkjvutwu at www.arppress.org.

12/02/2025

For decades, the American Registry of Pathology (ARP) has been the cornerstone of pathology education globally, thanks to the definitive AFIP/ARP Fascicles.

This , your donation ensures this vital tradition continues for the next generation of pathologists.

Help us secure this legacy. Give today: https://arppress.org/pages/donate

12/02/2025

More from arppress.org/books/book/69:
Choroid plexus papilloma represents a well-differentiated choroid plexus tumor that commonly exhibits focal glial differentiation (elongated GFAP-positive cells).

12/02/2025

We'll take a dive into the new non-neoplastic skin fascicle (arppress.org/books/book/70), and some if its excellent images, in January to celebrate the new year!

Meanwhile, we'll continue with our exploration of the CNS tumor fascicle (arppress.org/books/book/69) for the rest of December.

The human skin, as the largest organ of the body, is home to numerous neoplastic and non-neoplastic disorders. The vast majority of non-neoplastic skin dis

12/01/2025

New release for at arppress.org. Introducing Non-Neoplastic Disorders of the Skin, the must-have clinical atlas for anyone interpreting challenging skin biopsies. With its wealth of high-quality clinical and histopathologic images, this book is your new go-to resource.

11/28/2025

Shop www.arppress.org and get 20% off books with code: Black Friday-l3rdew34