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American Registry of Pathology Press

Publisher of the AFIP/ARP fascicles

09/04/2025

It's September, and Tumors of the Thyroid and Parathyroid Glands (arppress.org/books/book/68) has joined our series 5 fascicles!
Solid cell nests are remnants of the ultimobranchial bodies and are found in 3% of routinely examined thyroid glands. They often have a squamoid appearance.

09/01/2025

This Labor Day, get 20% OFF sitewide at ARPPress.org. It's the perfect opportunity to get caught up with the latest fascicles. Use code: Labor Day-hd4kenh0

08/29/2025

More from arppress.org/books/book/67:
Paragangliomas are neural crest-derived tumors differentiating into paraganglion cells; they have classic nested architecture ("Zellballen"), occasionally with prominent, hyalinized stroma.

08/19/2025

More from arppress.org/books/book/67:
Vocal cord polyps and nodules are degenerative lesions derived from stromal abnormalities in Reinke space (the “gelatinous” connective tissue space in the true vocal cord).

08/18/2025

Our newly updated fascicle on Thyroid and Parathyroid Tumors is now available. This must-have comprehensive guide for pathologists and physicians incorporates the latest WHO 5th edition classification, focusing on differential diagnosis, molecular pathology, and genetic alterations. Get your copy today: arppress.org

08/09/2025

From arppress.org/books/book/67:
Nuchal-type fibroma is a benign, highly collagenized soft tissue tumor that occurs primarily in the posterior neck, paraspinal, and interscapular regions of adults. Almost 50% of reported patients have had diabetes.

08/01/2025

Happy August! More from (arppress.org/books/book/67):
Low-grade nasopharyngeal papillary adenocarcinoma (LGNPA) shows a papillary growth pattern and is associated with an indolent biologic behavior. These are TTF1 positive!

07/24/2025

More from arppress.org/books/book/67:
The organ of Chievitz, which lies along the lingual posterior mandible, is a neuroepithelial structure that should *not* be confused for perineural invasion by squamous cell carcinoma.

07/22/2025

Our Newest Fascicle is Now Available at www.arppress.org
Become a Subscriber and Save! (Subscriber form here: https://bit.ly/TraditionalSubscriber )

07/16/2025

Hot off the press from https://arppress.org/books/book/67:
Embryonal rhabdomyosarcoma (RMS) is the most common type of RMS of the head and neck; submucosal tumors classically display a “cambium zone” of increased cellularity immediately below the epithelium.

07/07/2025

A preview from the new Series 5 fascicle: Tumors of the Upper Aerodigestive Tract, Ear, and Jaw (arppress.org/books/book/67):
Granular cell tumor is a benign neuroectodermal tumor that can be accompanied by overlying pseudoepitheliomatous hyperplasia (second image set; not to be mistaken for squamous cell carcinoma). More than 50% of cases of granular cell tumor involve the head & neck!

06/17/2025

More from arppress.org/books/book/42:
Diverticula can affect the vermiform appendix (incidence

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