Gorlin-Goltz Syndrome (Nevoid Basal Cell Carcinoma Syndrome)
On this page
Direct answer
A young patient who develops two or more odontogenic keratocysts, or a first keratocyst in the teenage years, should be examined for Gorlin-Goltz syndrome — the nevoid basal cell carcinoma syndrome, an autosomal dominant disorder caused by mutation of the PTCH tumour suppressor gene on chromosome 9q. Jaw cysts are frequently the earliest and sometimes the only manifestation, which is precisely why the dentist may make the diagnosis years before the dermatologist. The full picture adds multiple basal cell carcinomas, palmar pits, bifid or fused ribs, calcification of the falx cerebri, frontal bossing with hypertelorism, ovarian fibromas and a susceptibility to childhood medulloblastoma. Management of the cysts follows keratocyst principles, but the syndrome converts a single operation into lifelong surveillance of the patient, not just the jaw.
What you must remember
- Genetics: autosomal dominant with high penetrance and variable expressivity; loss-of-function mutation of PTCH (the patched receptor of the Hedgehog signalling pathway) at chromosome 9q22.3-q31 — the standard one-line viva answer.
- Keratocyst burden: the great majority of syndrome patients develop multiple odontogenic keratocysts over their lifetime, often in the teenage years and often in the mandible; a new cyst at follow-up is expected, not surprising.
- Basal cell carcinomas: appear from puberty onwards, typically on sun-exposed skin; a large number in a young person, or BCCs in childhood, is a red flag for the syndrome.
- Skeletal stigmata: bifid, fused or splayed ribs (a classic chest radiograph question), kyphoscoliosis, short fourth metacarpals, and bridging of the sella with a calcified falx cerebri on skull films.
- Soft-tissue signs: palmar and plantar pits (small punctate depressions, highly characteristic), frontal and biparietal bossing, hypertelorism, mild prognathism.
- Neoplastic risk: medulloblastoma in early childhood (the reason paediatric neuro-oncology referrals are screened for jaw cysts) and cardiac or ovarian fibromas.
- Dental relevance: cysts behave as ordinary keratocysts — parakeratinised lining with basal palisading — and demand the same decompression, enucleation with adjuvants or resection logic plus long-term radiographic review; recurrence and new-cyst formation both occur.
How a first cyst uncovers a syndrome
A 16-year-old is referred for expansion of the left mandibular angle with a well-defined unilocular radiolucency at the third molar. The tooth is vital, the cortex thinned. At surgery the cyst shells out with the typical thin, fragile wall and whitish keratin contents; histology shows a parakeratinised stratified squamous lining, corrugated surface, palisaded basal layer — odontogenic keratocyst. Step one after histology is to look at the whole mouth: an OPG reveals a second, smaller pericoronal lucency in the right mandible and a third in the maxillary tuberosity. Step two is the general examination this triggers: inspect the palms for pits, the face for early basal cell nevi, the chest radiograph for bifid ribs, the skull film for a calcified falx. Step three is genetic confirmation of a PTCH mutation by a clinical geneticist, with counselling for first-degree relatives since about half of cases are familial. Step four is surgical planning — multiple cysts are decompressed or enucleated as they present, and growth-centre-sparing approaches are preferred in a growing face. Step five is lifelong structured follow-up: annual OPGs through the third decade, dermatological surveillance from puberty, and shielding of children from therapeutic radiation, since these patients are unusually radiosensitive.
Where students slip
The commonest error is treating the jaw cyst as an isolated event — a patient below about twenty-five with an odontogenic keratocyst, or anyone with two keratocysts, multiple basal cell carcinomas or a suggestive family history, merits syndrome screening, and saying so earns marks in long answers. The second slip is nomenclature: the WHO 2005 classification renamed these lesions keratocystic odontogenic tumours and the 2017 revision restored "odontogenic keratocyst"; either term is accepted in Indian university answers, but the syndrome association never changed. Third, students confuse the gene — PTCH on chromosome 9 for Gorlin-Goltz, not chromosome 17 (NF1) or 22 (NF2); examiners enjoy this cross-table trap. Finally, radiotherapy for the cysts is a poor choice here because of the documented radiation sensitivity driving new basal cell carcinomas in the field.
Frequently asked questions
What gene and chromosome underlie Gorlin-Goltz syndrome?
Mutation of the PTCH tumour suppressor gene on the long arm of chromosome 9 (9q22.3-q31), inherited autosomal dominantly with variable expressivity.
Which oral finding most often reveals the syndrome?
Multiple odontogenic keratocysts appearing early — often in adolescence — are frequently the first manifestation, so any young patient with one keratocyst deserves screening examination and radiographs.
Which skeletal radiographic signs are considered classic?
Bifid, fused or splayed ribs, calcification of the falx cerebri, bridging of the sella turcica and short fourth metacarpals form the standard radiographic cluster.
What are palmar pits?
Small punctate epithelial depressions on the palms and soles, highly characteristic of the syndrome, representing focal basaloid proliferation; their presence on simple inspection supports the diagnosis.
Why is radiotherapy avoided for these patients?
The underlying DNA repair and Hedgehog pathway defect makes tissues abnormally radiosensitive, with radiation promoting new basal cell carcinomas within the treated field.