2. Definition
• A traumatic bone cyst is an empty intrabony
cavity that lacks an epithelial lining.
• The designation of pseudocyst relates to the
cystic radiographic appearance and gross
surgical presentation of this lesion It is seen
mostly in the mandible.
3. Etiology and Pathogenesis
• The pathogenesis is not known, in some cases seem to be
associated with antecedent trauma.
• It has been hypothesized that a traumatically induced
hematoma forms within the intramedullary portion of bone.
• Rather than organizing, the clot breaks down, leaving an
empty bony cavity.
• Alternative developmental pathways include cystic
degeneration of primary tumors of bone, such as central giant
cell granuloma, disorders of calcium metabolism, and
ischemic necrosis of bone marrow.
4. Clinical Features
• Teenagers are most commonly affected
• The most common site of occurrence is
the mandible
• Swelling is occasionally seen
• pain is infrequently noted.
5. Radiograph finding
Radiographically, a well-delineated area of
Radiolucent area with scalloping borders
between the roots of the teeth
6. Diagnosis
• Have no epithelial lining . Appear empty at
operation or contains pale fluid .
• Diagnosis suggested by radiographic features
(especially extension between tooth roots)
7. Histopathology
• Grossly, only minimal amounts of
fibrous tissue from the bony wall are
seen. The lesion may occasionally
contain blood or serous fluid.
• Microscopically:
delicate, wellvascularized, ibrous
connective tissue without evidence
of anepithelial component is
identified
