Pathology · single question
Tooth #187 shows a radicular cyst. From which tissue are the cells encapsulating this pathologic lesion derived?
Show answer and explanation
Correct answer: C. Epithelial rests of Malassez
- A. Incorrect. Tomes processes are cytoplasmic extensions of AMELOBLASTS used during enamel matrix secretion — not related to radicular cyst formation.
- B. Incorrect. The stratum intermedium is a layer of the enamel organ between the inner enamel epithelium and the stellate reticulum — not involved in cyst lining.
- C. Correct. The EPITHELIAL RESTS OF MALASSEZ are remnants of Hertwig's Epithelial Root Sheath that remain in the periodontal ligament after root formation. Chronic periapical inflammation stimulates these rests to proliferate, eventually forming the epithelial lining of a RADICULAR (periapical) CYST. This is the tissue source of the encapsulating cells.
- D. Incorrect. Striae of Retzius are incremental growth lines in enamel — not cells involved in cyst formation.