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If the tooth is deemed restorable and has a reasonable prognosis, root canal treatment is the treatment of choice. The aim of root canal treatment is to remove any vital and necrotic pulp that might be sustaining and stimulating the resorbing cells via their blood supply and to disinfect and obturate the root canal system. Access cavity preparation should be conservative, preserving as much tooth structure as possible and should avoid further weakening of the already compromised tooth. Prognosis is good; however, the patient must be recalled, since the resorptive defect can recur. Once perforation occurs, therapy becomes more difficult and the prognosis is poor; in such cases repair must be carried out to create a barrier. Initial placement of calcium hydroxide paste occasionally may result in remineralisation of the site of perforation and stop the resorptive process. Extraction often is necessary for radicular perforation that does not respond to therapy.4 Learning points Root canal treatment remains the only treatment of choice with teeth diagnosed with internal resorption. Early detection and a correct differential diagnosis are essential for successful management of the outcome of internal resorption to prevent over weakening of remaining tooth structure and root perforations. Because the resorptive defect is the result of an inflamed pulp and the clastic precursor cells are predominantly recruited through the blood vessels, controlling the process of internal root resorption is conceptually easy, via the blood supply to the resorbing tissues with conventional root canal therapy. Footnotes Competing interests: None. Patient consent: Obtained. Vemurafenib chemical structure Provenance and peer review: Not commissioned; externally peer reviewed.""An 88-year-old woman with a background of chronic lymphocytic leukaemia (CLL) and presented with unilateral ptosis and dull facial pains for 1?month. Examination revealed a complete right-sided ptosis and pupillary dilation. Vision in her right eye was limited to light perception. She had total external ophthalmoplegia. Her corneal reflex was not present in her right eye and she had lost sensation on the right side of her forehead. MRI revealed abnormal enhancement in the right orbital apex extending posteriorly to the sphenoid sinus. The mass invaded the superior orbital fissure, optic canal and cavernous sinus. The lumbar puncture was normal. Owing to the proximity of the mass to the cavernous sinus, it was deemed that surgical excision of the tumour was unsafe; however, it was amenable to biopsy. Histology of the biopsies was consistent with CLL. The patient declined to undergo single high-dose radiotherapy followed by dexamethasone. Background This case demonstrates the unpredictable nature of chronic lymphocytic leukaemia (CLL). CLL has never been known to cause orbital apex masses. Furthermore, the patient had very good signs which have been photographed, with the patient��s permission.