## 3 Discussion  
Any type of oral cavity cysts or tumors should be fully visualized and evaluated on a CBCT. Detailed patient anamnesis should include any clinical symptoms occurring with the lesion, co-existing morbidities, and time of occurrence. Most tumors and cysts occur in the presence of a retained tooth, mostly in the mandibular posterior region. LPC can be easily diagnosed based on radiological and clinical symptoms [1; 2; 3; 4; 5]. Most often, its location between anterior/premolar mandibular tooth roots is found as a typical sign of this cyst. Some authors hypothesize that because of an LPC's close relation with root surface, a possible origin from the cell rests of Malassez could be important [3; 5]. Rarely, its atypical features, such as cortical expansion or tooth displacement, occur. An additional CBCT is mandatory to establish close features of the lesion [5; 6; 7; 8]. According to [PERSON] et al. and [PERSON] et al., cortical plate expansions should always be carefully examined, especially in any case of GOC/BOC or any other appearances of irregular lesions in classic radiographs [3; 5]. On the other hand, to fully establish the degree of bone loss and direct proximity of vital teeth, maxillary sinus or nerve/artery branches, in any cystic lesion, a CBCT is nowadays a gold standard of diagnostics, which is also confirmed by [PERSON] et al. [8]. In cases of tooth resorption and irregular bone lesions, other odontogenic or non-odontogenic cysts or tumors can be suspected [7; 9]. Usually, LPC is diagnosed accidentally during routine control radiograph, which is well described in most cases [12; 13; 14; 15]. Rarely, atypical situations might occur, including its inflammation, huge size, and atypical location between crowns or opposite to the buccal side. Secondary  
Figure 13: CBCT axial view after 15 months after surgery. infection in LPC is rare, and might be related with as surrounding teeth remain non-vital because of damage to the apex vital structures [5; 6; 7; 8; 9; 10; 11; 12]. Since LPC has a low re-occurrence rate that requires in most cases simple cyst removal, with or without additional curettage, no other special approaches are needed [7; 16; 17]. Curettage itself is used to avoid remaining any cyst remnants and improve surgical quality [17; 18; 19; 20; 21]. On the other hand, cases of bigger, expansive LPC forms, along with GOC and BOC forms of LPS, which are rare, require a more radical approach because of a big possible re-occurrence rate around 22-35% in total [18; 19; 22]. [PERSON] et al. underlined the necessity of more extensive surgeries in cases of bigger pathologies; nevertheless, involvement of two or more teeth, propagation towards nasal cavity, or maxillary sinus or palate destruction in maxillary lesions are considered factors of more difficult surgery [17; 18; 19; 22]. The more aggressive form, BOC is named by many authors as a polymorphous odontogenic cyst [7; 15]. Microscopic evaluation of the cyst wall can describe the form of the lesion, either a classic LPC or a more aggressive multicystic or botryoid form. In any case of microcyst formation in the microscopically evaluated cyst wall, this finding should arouse suspicion about a possible more aggressive form of the lesion [3; 7; 9; 15; 16; 22]. Most pathologies are located in the posterior mandible, mostly associated with some type of impacted teeth, especially third molars. In most cases, odontogenic keratocysts (ODC), dentigerous cysts, variants of ameloblastoma, or others, including BOC and GOC, in the anterior mandible/maximly region should be differentiated from [1; 2; 3; 4; 5; 6; 7]. Since their bone aggression is bigger and more rapid in time, more radical surgery is discussable. A detailed histopathological specimen biopsy is needed to establish the nature and aggressiveness of the lesion [5; 9; 14; 15; 16]. Therefore, authors in the presented study, because of cortical expansion, additionally combined bone curettage with local bone cavity osteotomy.