Oral Pathology I - Chapter 7 - Cyst - 2022-2023 PDF

Dr.Ahmed Ashour DR.Ahmed.A shour 011424051 79 Oral Pathology I Chap ter 7 Cyst DR.Ahmed Ashour  Dr.Ahmed Ashour - ----~-l'2_Pl,__l o1t42405179...

Dr.Ahmed Ashour DR.Ahmed.A shour 011424051 79 Oral Pathology I Chap ter 7 Cyst DR.Ahmed Ashour  Dr.Ahmed Ashour - ----~-l'2_Pl,__l o1t42405179 Pathologic cavity lined by epithelium & contains fluid, semi fluid or gases material. Oo....__........___ __...~-c.=;o,, Pathologic cavity ru!1 lined by epithelium lo Cysts of jaw - --- - _ More common than any other bone due to presence of many epithetlial rests. aD-- Components I-Lumen ( cavity) 2-epitjelial lining 3-Wall (capsule) ijQ F~equeocy ~ Radicular cyst > Dentigerous cyst > Odontogenic keratocyst > Residual cyst > Paradental cyst C assification Pseudocyst /11traosseo11s Extraosseous o,tonto 0 enic No11-odo11to 0 e11ic Soft tissue cvst I-Periodontal cyst ·'Developmental and 1-Derrnoid & Epiderrnoid cyst. 1- Traumatic inflammatory" 2-Thyroglossal tract cyst bone cyst 2-Dentigerous cyst 3-Benign lympho-epithelial cyst. 2-Aneurysmal 3-Gorlin COC 4-Mucous retention & bone cyst 4-OKC extravasation cyst 3-Static bone cyst 1, R"tliographic fe"t11re I \ ,-------- \ Well defined , Common \ Usually radio lucent (Exception ➔ Gorlin cyst) I / : _ features~ ,' Unilocular radiolucent (Exceptions appear multilocular➔ OKC & botryoid cyst) I Site Usually intraosseous (Exception appear extraosseous➔ Solt ti:-::-s~ s L-;::,e;--:c;-;;·y:;;s:,·t'.- - -- - - -~ - - Shape It Painkss slowly growing hnr~ Site: Maxilla > Mandible (mostly affect maxillary lateral incisor). Signs & symptoms: Usually affect non-vital tooth. Slowly growing painless hard swelling. If infected➔ Swelling increase & become painful. Later➔ Swelling become less hard➔ Egg shell crackling sensation ➔ Soft fluctuant bluish swelling Radiographically: Well-defined and corticated unilocular radiolucency. Characterized by thin, unifonn, radiopaque line. Cyst may displace inferior alveolar canal or invaginate maxillary antrum. Thinning ofbuccal or lingual cortical plate. Tynes: r---- : Apical (most common)➔ at root ;pex --~:::-=-- ---------------------- I ---- 1--- :- - Lateral➔ at side of root (infection-;assing through lateral branch of r~ot ca~~I)- - - - ~ ~:::. -:.-. ---------------------------------------------------, ------ ------- : -------------------------------------------~~::::___ _--- Residual➔ Persists after extraction of tooth (swelling in edentulou s ridge) - - - - -- - - - - - - -- - - - - - - -- - - - - - - - --- - - - -- - - - --- - - - - - - - ,,_____ _--- __ _ ::::.:-- ~i --) ---.'.. k..,;. ' Histopathology: Lumen: Filled with yellowish watery and opalescent fluid with glistening appearance (contain cholesterol crystals) lmm"ture cyst 111"/I Thick, irregular & hyperplastic epithelial cells. ,l/(l/1tre cyst wall I Thin flattened well organized st. sq. ep. li11i11,: Showing netlike fonning rings and arcades Hyaline bodies and Rushton bodies may be Lack defined basal cell layer seen Page 2 - Cyst - Oral Pathology I  _r_.A _D _h_m _ e_d_A_s_h_o_u_r _,_ _'9 14 0_1__ _..._j_ _____ ___WhalsApp _ 2_4_0_5_1_7_9_ ·- -- - -- · - --------· - ·-- --- --------- - --·--- - ------, Delicate Thick Well vascularized Less vascularized ' C.Twa/1 Minimal infiltration Cholesterol cleft➔- needle like sp~~e resulted from d_issolving Heavy infiltrated with ~h~!esterol _crystaJs ~uri_pg_p_r_i:parati~!l by X)'lol chronic.in tlafritnatofy ·eel Is Cholesterol cleft ➔ Enclosed by foreign body giant cells, extravasalt!d red cells and blood pigments Clinical: Age: 20-60 years (Peak-in 6th ·decade}" Sex: o'>~ Site: Lateral PDL regions of Mandibular premolars followed by anterior maxilla. S&S: Usually asymptomatic Associated with vital tooth Radiographically: Well-defined unilocular radiolucency with sclerotic margin located laterally on the root of vital tooth. May be multilocular & called botryoid odontogenic cysts showing grape like clusters of small cysts. Histopathology: Glycogen reach clear cells is detected in lining. _o_1_u_cu_1_a_r_c_ys_t_" _-=--_J--l- Residual affect skin). blastomeres, which can produce Second tl,eory ?Cystic change in Usually associated with epithelial along this pathway give rise to it derivatives of all 3 germ layers. parotid & its entrapment in cervical Clinical: Gardener syndrome. Clinical: lymphnode. Age: Soft fluctuant sublingual Site: Clinical: Before 25 years swelling crossing the Appear on midline ''Unilateral". Age: Sex: midline. If develops above geniohyoid Young adult No sex predilection Histopathology: muscle ➔ sublingual swelling Site: Site: Lined by stratified squamous will displace tongue ➔ Difficulty Lateral side of neck (usually Mostly ➔ Midline below hyoid bone. epithelium. in eating, speaking or breathing. unilateral). May occur iii tongue (Lingual thyroid Lumen filled with If develops below geniohyoid nodule) orthokeratin. muscle➔ submental swelling Aong anterior border of sternomastoid muscle S&S: (double chin). S&S: Painless fluctuant movable swelling. His to pathology: Usually unilateral Retract on swallowing➔ If maintains Thin keratinized stratified Soft fluctuant asymptomatic attachment to hyoid bone. squamous epithelium. enlargement. Retracts on tongue movement➔ If Numerous sebaceous gland & Histopatbology: maintains attachment to tongue. hair follicle Stratified ep. lining usually Histopatbology: I columnar. Ciliated pseudostratified epithelial C.T \\-all contain lymphoid tissue lining. lining. \\ ith germinal centers. Thyroid tissue might be seen within CT. I j I Page 8 - Cyst - Oral Pathology - Dr. Ahmed Ashour j  --.... ------='jl ____ ____ ____ ___==--=m -------- =a=:=c,o::...j:,:.....,.."""c,a__.,__,.._.,.:a_:,a,. __ _ _ _ __,..., t~:......,.=a==aa=11C1""""""