Odontogenic Cysts
Lateral Periodontal Cyst
aka LPC · Botryoid Odontogenic Cyst (polycystic variant)
Uncommon developmental odontogenic cyst located along the lateral root surface of a vital tooth, most often in the mandibular premolar–canine region.
Red Flags
- ·Multilocular appearance → botryoid variant, watch for recurrence
Clinical Tips
- ·Always test pulp vitality before assuming a lateral radiolucency is a radicular cyst.
- ·Preserve tooth vitality — approach from buccal to spare palatal root supply.
Examination Checklist
- ·Vitality tests
- ·Periodontal probing
- ·IOPA + OPG
- ·CBCT if surgical planning needed
§ figuresFigures (0)
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§ overviewOverview
A developmental odontogenic cyst arising from rests of dental lamina, located on the lateral aspect of a vital tooth root, characterised by a thin non-keratinised epithelial lining with focal plaque-like thickenings.
§ icdICD Classification
ICD-10 K09.0
§ etiologyEtiology
- 01Developmental — from rests of dental lamina (Serres) or reduced enamel epithelium along lateral root
§ riskRisk Factors
- 01Nil identified
§ geneticsGenetics & Molecular Biology
- 01No germline predisposition documented
§ epidemiologyEpidemiology
< 1% of jaw cysts. 5th–7th decade. Slight male predilection. Mandibular premolar–canine region (~70%), maxillary lateral incisor–canine region.
§ pathogenesisPathogenesis
Post-eruption proliferation of dental lamina rests along lateral root surface → microcyst formation → coalescence into a small cyst with characteristic plaque-like epithelial thickenings.
§ clinicalClinical Features
- 01Usually asymptomatic — incidental radiographic finding
- 02Occasional painless swelling on facial gingiva
- 03Associated teeth are vital and non-carious
§ signsSigns & Symptoms
- 01No pain, no tooth mobility in most cases
- 02May present as a sessile gingival swelling (gingival cyst counterpart)
§ differentialDifferential Diagnosis
- 01Lateral radicular cyst (associated tooth non-vital)
- 02OKC
- 03Gingival cyst of adult
- 04Mental foramen (mimic)
- 05Periodontal defect / lateral cemental cyst
§ criteriaDiagnostic Criteria
- 01Small (< 1 cm) unilocular radiolucency between the roots of vital teeth
- 02Histology: thin non-keratinised lining with focal plaque thickenings containing glycogen-rich clear cells
§ histopathHistopathology
- 01Thin (1–5 cell) non-keratinised stratified squamous or cuboidal epithelium
- 02Focal nodular epithelial thickenings (plaques) with clear glycogen-rich cells
- 03Fibrous connective tissue wall with minimal inflammation
- 04Botryoid variant: multilocular with several small cystic spaces
§ radiographicRadiographic Features
- 01Well-defined round to oval radiolucency between roots
- 02Corticated margin
- 03Roots displaced but rarely resorbed
§ opgOPG Findings
- 01Screening view; often incidental
§ cbctCBCT Findings
- 01Confirms lateral (not periapical) location and relation to roots and vital structures
§ ctCT Findings
- 01Rarely required
§ mriMRI Findings
- 01Not routinely indicated
§ investigationsInvestigations
- 01Vitality tests of adjacent teeth (must be vital)
- 02Periapical radiograph
- 03CBCT for surgical planning
- 04Histology after enucleation
§ labsLaboratory Findings
- 01Non-specific
§ ihcIHC / Special Stains
- 01Clear cells PAS-positive (glycogen)
- 02CK-13, CK-19 positive lining
§ whoWHO Classification
WHO 2022: Developmental odontogenic cyst — Lateral periodontal cyst (botryoid variant = polycystic form).
§ classificationClassification
- 01Classical LPC (unilocular)
- 02Botryoid odontogenic cyst (multilocular variant, higher recurrence)
- 03Gingival cyst of the adult (soft-tissue counterpart)
§ planTreatment Planning
- 01Confirm vitality of adjacent teeth
- 02Plan flap access to preserve tooth vitality and periodontal support
§ treatmentTreatment
- 01Conservative enucleation with preservation of adjacent teeth
- 02Botryoid variant may require enucleation with careful curettage due to multilocularity
§ medicalMedical Management
- 01Nil specific
§ surgicalSurgical Management
- 01Full-thickness mucoperiosteal flap, careful enucleation, primary closure
§ reconstructionReconstruction Options
- 01Small defects heal spontaneously; occasional bone graft for larger defects
§ complicationsComplications
- 01Loss of tooth vitality (rare)
- 02Recurrence in botryoid variant
§ recurrenceRecurrence Rate
Classical LPC < 5%; botryoid variant up to 30% — merits closer follow-up.
§ followupFollow-up Protocol
- 01Clinical + radiographic review at 6 and 12 months
- 02Botryoid: yearly for 5 years
§ prognosisPrognosis
Excellent for classical LPC; guarded for botryoid due to recurrence.
§ preventionPrevention
- 01None applicable
§ examKey Examination Points
- 01Vital tooth + interradicular radiolucency = LPC
- 02Do not confuse with lateral radicular cyst
§ revisionQuick Revision Summary
- 01Vital tooth, interradicular, small unilocular radiolucency, glycogen-rich clear cells, mandibular premolar region
§ vivaBDS Viva Questions
- 01Differentiate LPC from lateral radicular cyst.
- 02What is the botryoid odontogenic cyst?
- 03Histologic hallmarks of LPC?
- 04Recurrence in botryoid variant?
- 05Most common site of LPC?
- 06Origin of LPC?
- 07Which cells are PAS-positive?
- 08Radiographic differential for interradicular radiolucency?
- 09Treatment of LPC?
- 10Follow-up protocol?
§ bdsBDS Professional Examination
- 01Short note: Lateral periodontal cyst.
- 02Short note: Botryoid odontogenic cyst.
§ fcpsFCPS Residency Questions
- 01Discuss the classification and management of lateral radiolucencies of the mandible with emphasis on developmental cysts.
§ pearlsClinical Pearls
- 01Vital tooth + tiny interradicular radiolucency = LPC.
- 02Botryoid variant recurs — treat like a mini-OKC.
§ mnemonicsMnemonics
- 01LPC = Lateral, Premolar, Clear cells
§ readingSuggested Reading
- 01Cawson RA, Odell EW. Cawson's Essentials of Oral Pathology, 9e
- 02Shear M. Cysts of the Oral and Maxillofacial Regions, 4e
§ differentialDifferential Comparison
| Entity | Feature | Distinguisher |
|---|---|---|
| Lateral radicular cyst | Non-vital tooth | Vitality testing |
| OKC (lateral variant) | Larger, more aggressive | Parakeratin, higher recurrence |
| Botryoid odontogenic cyst | Multilocular grape-like | Higher recurrence than LPC |
§ mcqsMCQs — Assessment (20)
Question 1
Vitality of adjacent tooth in LPC is:
Question 2
Most common site is:
Question 3
Characteristic histological feature:
Question 4
Multilocular variant of LPC is called:
Question 5
Recurrence in botryoid variant:
Question 6
LPC arises from:
Question 7
Treatment of choice:
Question 8
Clear cells stain with:
Question 9
Age group most commonly affected:
Question 10
LPC lining is typically:
Question 11
Radiographically LPC appears as:
Question 12
Which is the soft-tissue counterpart of LPC?
Question 13
Which is FALSE about LPC?
Question 14
Best imaging for surgical planning:
Question 15
Which cyst has the highest recurrence rate among developmental odontogenic cysts?
Question 16
Ki-67 in LPC is:
Question 17
Which mimics LPC clinically?
Question 18
Aspirate of LPC typically shows:
Question 19
Complication of enucleation:
Question 20
Follow-up for botryoid variant:
§ evidenceReferences & Evidence
Current Classification
WHO Classification of Head and Neck Tumours
5th Edition — Volume 9
WHO Classification of Tumours Editorial Board · 2022
The authoritative international classification of head and neck, odontogenic and salivary gland tumours. Current terminology on this site follows this edition.
Evidence summary
Highest level of evidence linked to this page: WHO / Official Classification.
- L1 · Classification — 3
- L6 · Textbook — 3
1 linked source was published from 2024 onwards. Where guidance is limited or contested, rely on the higher-level sources above rather than this summary. Educational use only — not a substitute for clinical judgement.
Content last reviewed
September 2026
Evidence last reviewed
September 2026
Next scheduled review
September 2027
Review status
EVIDENCE REVIEWED
Search latest PubMed evidence
Last literature search: 7 September 2026
Current Classification
WHO Classification of Tumours Editorial Board. IARC / World Health Organization · 2022
The authoritative international classification of head and neck, odontogenic and salivary gland tumours. Current terminology on this site follows this edition.
Vered M, Wright JM. Head and neck pathology · 2022 · 16(1):63-75
Summary of odontogenic and maxillofacial bone tumour changes in the 5th edition WHO classification.
IARC / WHO. IARC · 2022
Continuously updated online edition of the WHO head and neck tumour classification.
Histopathology References
Barnes L. CRC Press · 2008
Detailed histopathological reference for head and neck diagnostic criteria.
Textbook References
Neville BW, Damm DD, Allen CM et al.. Elsevier · 2024
Standard reference textbook of oral and maxillofacial pathology used throughout this atlas.
Rajendran R, Sivapathasundharam B. Elsevier · 2020
Undergraduate and postgraduate oral pathology textbook widely used in BDS and FCPS curricula.
Additional sources cited on this page
- WHO Classification of Head and Neck Tumours, 5e (2022)
- Neville BW. Oral and Maxillofacial Pathology, 4e
- Shafer's Textbook of Oral Pathology, 9e
Draft — pending faculty review. Educational use only; verify against current guidelines and primary sources before clinical application.