Pathology · patient case question
What is the diagnosis for Patient A?
Patient case: Three radiopacities on three panoramic films
Patient: Three separate patients
Chief Complaint: Each attended for routine or eruption-related assessment.
Background: Patient A: 12-year-old, permanent maxillary central incisor has failed to erupt. Patient B: 44-year-old, asymptomatic. Patient C: 31-year-old, referred by a physician; a sibling had bowel surgery in his twenties.
Findings: Patient A: a cluster of multiple small tooth-like radiopacities in the ANTERIOR MAXILLA overlying the unerupted incisor, each with a narrow radiolucent rim. Patient B: a uniformly dense, well-defined radiopacity at the apex of the mandibular first molar, which carries deep caries; no expansion. Patient C: multiple unerupted and supernumerary teeth, several dense bony masses of the jaws and skull, and a history of colorectal polyps in the family.
Show answer and explanation
Correct answer: B. Compound odontoma
- A. A cementoblastoma is a radiopaque mass FUSED to the root of a vital tooth, classically a mandibular first molar, surrounded by a radiolucent rim and frequently painful. It is attached to a root, not overlying an unerupted crown.
- B. CORRECT. A COMPOUND ODONTOMA is composed of multiple small, discrete TOOTH-LIKE structures (denticles), each containing enamel, dentin, cementum and pulp arranged in their normal relationship to one another, surrounded by a narrow radiolucent rim. It favours the ANTERIOR MAXILLA and is the more frequent of the two variants. Both odontomas are hamartomas rather than true neoplasms, both are treated by conservative surgical enucleation, and neither recurs. The commonest reason either is discovered is exactly this — investigation of a permanent tooth that has failed to erupt.
- C. Ameloblastic fibro-odontoma is a mixed lesion of young patients combining odontoma-like calcifications with ameloblastic fibroma soft tissue. It is expansile, considerably rarer, and does not present as discrete denticles.
- D. A COMPLEX ODONTOMA is an amorphous CONGLOMERATE mass of the same four dental tissues with NO resemblance to a tooth — a disorganised arrangement of tubular dentin, enamel and thin layers of cementum. It favours the POSTERIOR MANDIBLE. Location and internal architecture are the two discriminators, and this lesion fails both.
Note: The point the recall emphasises: BOTH variants contain all the dental tissues INCLUDING CEMENTUM. The exam discriminator is simply whether the lesion looks like teeth (compound, anterior maxilla) or like a shapeless mass (complex, posterior mandible). Compound is a lesion of childhood and adolescence; complex peaks in the second decade.