Diseases of Bone Manifested in the Jaws

Comprehensive practice flashcards covering radiographic interpretations of bone diseases in the jaws, including Fibrous Dysplasia, PCD, FOD, COF, CGCG, ABC, Cherubism, Paget’s Disease, and LCH.

How is 'Diseases of Bone Manifested in the Jaws' defined in the transcript?

A group of pathological conditions affecting the structure, density, or function of the jawbones (mandible and maxilla), resulting from abnormalities, infections, metabolic disturbances, neoplasms, or trauma.

What is the primary pathological change in Fibrous Dysplasia?

A localized change in bone metabolism where cancellous bone is replaced by fibrous tissue containing abnormal-appearing bone.

Which form of Fibrous Dysplasia most often involves the jaws?

The solitary or monostotic form.

What are the most common sites for monostotic fibrous dysplasia (in order)?

Ribs, femur, tibia, maxilla, and mandible.

In which age group is the polyostotic form of fibrous dysplasia usually found?

Children younger than $10$ years.

How does the internal density of Fibrous Dysplasia typically compare between the maxilla and normal bone?

It is generally more radiopaque in the maxilla and the base of the skull.

What is the term for a lesion appearance containing multiple, distinct, overlapping compartments separated by thin bone?

Multilocular.

How much more often does Fibrous Dysplasia involve the maxilla compared to the mandible?

Almost twice as often.

What effect can dense Fibrous Dysplasia have on the periodontal ligament space?

The periodontal ligament space may appear to be very narrow.

What is the key radiographic differentiator between Fibrous Dysplasia and Paget's disease?

Fibrous dysplasia causes bone expansion.

Which imaging modality provides a three-dimensional representation for managing Fibrous Dysplasia?

Computed Tomography (CT).

What is Periapical Cemental Dysplasia (PCD)?

A localized change replacing normal cancellous bone with fibrous tissue and cementum-like material or abnormal bone.

List three synonyms for Periapical Cemental Dysplasia.

Cementoma, fibrocementoma, and periapical osteofibrosis.

Are teeth involved in Periapical Cemental Dysplasia typically vital or non-vital?

Vital.

Where is the epicenter of a Periapical Cemental Dysplasia lesion usually located?

At the apex of a tooth.

What characteristic radiographic change occurs to the lamina dura in PCD?

The normal lamina dura of the involved teeth is lost.

What clinical test is essential to differentiate early PCD from periapical rarefying osteitis?

Vitality testing of the involved tooth.

Under what condition might PCD segments of cementum act as sequestra leading to secondary infection?

If the teeth are removed and the alveolar ridge atrophies, causing cementum to perforate the mucosa under a denture.

What is Florid Osseous Dysplasia (FOD)?

A widespread form of Periapical Cemental Dysplasia (PCD).

What are the common age and sex profiles for patients with Florid Osseous Dysplasia?

Middle-aged females, with a mean age of $42$ years.

Which racial groups show a marked predilection for Florid Osseous Dysplasia?

Blacks and Asians.

What is the typical location for FOD lesions?

Bilateral and present in both jaws.

How many quadrants must involve PCD to usually be considered Florid Osseous Dysplasia?

Three or four quadrants.

What nerve structure can be displaced inferiorly by large FOD lesions?

The inferior alveolar nerve canal.

How is Cemento-Ossifying Fibroma (COF) classified?

As a benign bone neoplasm.

Where does Cemento-Ossifying Fibroma most commonly occur in the mandible?

Inferior to the premolars and molars and superior to the inferior alveolar canal.

What happens to the cortical plate of bone in COF?

The outer cortical plate is displaced and thinned, but it remains intact.

How does the boundary of COF differ from that of Fibrous Dysplasia?

COF is better defined and may have a capsule, while Fibrous Dysplasia usually blends into surrounding bone.

What is the typical management and prognosis for COF?

Surgical enucleation or resection, with a favorable prognosis and unlikely recurrence.

What is the nature of Central Giant Cell Granuloma (CGCG)?

A reactive lesion to an unknown stimulus, rather than a neoplastic lesion.

What percentage of CGCG cases occur in individuals younger than $20$ years?

$60\%$.

What is the most common presenting sign of Central Giant Cell Granuloma?

Painless swelling.

What is the characteristic color of the overlying mucosa in CGCG?

Purple.

In which jaw does CGCG develop most frequently?

The mandible (twice as often as the maxilla).

How does the internal granular pattern of CGCG compare to its septa?

The granular bone can organize into ill-defined, wispy septa.

How do the trabeculae of CGCG differ from Ameloblastoma?

CGCG has wispy, ill-defined trabeculae, while Ameloblastoma has coarse, curved, well-defined trabeculae.

What blood test findings help differentiate brown tumors of hyperparathyroidism from CGCG?

Elevated calcium and parathyroid hormone levels.

How is Cherubism radiographically differentiated from CGCG?

Cherubism is bilateral and multifocal, whereas CGCG is typically unifocal.

What is an Aneurysmal Bone Cyst (ABC)?

A vascular reactive lesion of bone representing an exaggerated localized proliferative response.

What is the typical age range for individuals affected by Aneurysmal Bone Cysts?

Younger than $30$ years.

In an ABC, what internal feature represents large vascular spaces on a CT scan?

Radiolucent regions with a roughly circular shape.

What is the reported recurrence rate for ABC after surgical curettage?

$19\%$ to about $50\%$.

Which rare inherited autosomal dominant disease causes bilateral enlargement of the jaws in early childhood?

Cherubism.

Describe the clinical appearance of a child with profound maxillary swelling from Cherubism.

A 'cherubic' appearance with 'eyes raised to heaven' due to exposed sclera.

What direction do teeth typically displace in Cherubism?

In an anterior direction.

What is Paget’s Disease of bone commonly called?

Osteitis deformans.

Which lab values are often significantly elevated in patients with Paget’s Disease?

Serum alkaline phosphatase and hydroxyproline in the urine.

What is the 'cotton-wool' appearance in Paget’s Disease?

A late stage radiographic pattern where trabeculae are organized into rounded, radiopaque patches of abnormal bone.

How does the bone destruction in Langerhans’ Cell Histiocytosis (LCH) differ from periodontal disease?

LCH starts in the midroot region (scooped-out appearance), while periodontal disease starts at the alveolar crest.

What is the classic radiographic sign of LCH when alveolar bone is destroyed?

Teeth appear to be standing in space (or 'floating in space').