Imaging Features
As the epithelial lining is derived from the reduced enamel epithelium, on radiographic examination, a dentigerous cyst appears as a unilocular radiolucent area that is associated with just the crown of an unerupted tooth and is attached to the tooth at the cementoenamel junction. Dentigerous cysts may also involve odontomas, which by their nature also have “tooth crowns”. The radiolucency is generally well-defined and well-corticated. The radiolucency often have a sclerotic border indicating bony reaction, but a secondarily infected cyst may display ill-defined borders. However, a large dentigerous cyst may give the impression of a multilocular process due to the persistence of bone trabeculae within the radiolucency. The cyst-to-crown relationship presents several radiographic variations which are explained as follows:
Central variantThis is the most common variant which the cyst surrounds the crown of the tooth and the crown projects into the cyst. Lateral variantThis variant is usually associated with a mesioangular impacted mandibular third molar that is partially erupted. The cyst develops laterally along the root surface and partially surrounds the crown. Circumferential variantThe cyst surrounds the crown and extends for some distance along the root surface so that a significant portion of the root appears to lie within the cyst, as if the tooth was erupting through the centre of the cyst. The radiographic distinction between an enlarged dental follicle and a small dentigerous cyst can be difficult and fairly arbitrary. Generally, any pericoronal radiolucency that is greater than 3 to 4mm in diameter is considered suggestive of cyst formation.
Oral iron should thus be also considered. Parenteral iron therapy is an option as it accelerated recovery. Most women with mild to moderate anemia, however, resolve the anemia sufficiently rapidly with oral iron alone and do not need parenteral iron. Prognosis
Women with a history of PPH have a 2 to 3 times higher risk of PPH in their following pregnancies. References


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