Hypopharynx

Amyloid could infiltrate the various anatomical structures of the pharyngo-larynx, responsible for functional impairment and potential nutritional depletion and poor quality of life.
Paywall references
Pharyngo-laryngeal involvement in systemic amyloidosis with cardiac involvement: a prospective observational study. Bartier S, Bodez D, Kharoubi M, Canouï-Poitrine F, Chatelin V, Henrion C, Coste A, Damy T, Béquignon E. Amyloid. 2019 Jul 31:1-9. doi:10.1080/13506129.2019.1646639. PMID: (...)

Hyperplasia of lymphoid structures in the hypopharynx
A hypertrophied lymphoid polyp of the hypopharynx can be histologically diagnosed as the hyperplasia of ectopic tonsillar tissue.
Although ectopic tonsillar tissue of the hypopharynx is relatively rare, it should be included in the differential diagnosis of patients who are aware of a foreign body sensation in their throats.
Open references
Hyperplasia of lymphoid structures in the hypopharynx: a case report. 2010. (...)

WKP
The piriform sinus is a subsite of the hypopharynx. This distinction is important for head and neck cancer staging and treatment.
On either side of the laryngeal orifice is a recess, termed the piriform sinus (also piriform recess, pyriform sinus, piriform fossa, smuggler’s fossa or vallecula of throat), which is bounded medially by the aryepiglottic fold, laterally by the thyroid cartilage and thyrohyoid membrane. The fossae are involved in speech.
The term "piriform," which means (...)

Iron pill-induced tumefactive mucosal injury of the hypopharynx