Histopathological characteristics of eruption mesenchymal calcified hamartoma: two case reports

Varieties of pericoronal hamartoma: the concept of the disease entity revisited

“…Based on our judgment of the histological findings that Onishi et al. (1) presented in their report, it is difficult for us to agree with their point that these calcified masses should be recognized as a new variety of hamartoma, because the pericoronal hamartomas we have proposed should not be diagnosed with only a calcified mass but with the whole pathologic change of tissues, including fibrous connective tissues with mesenchymal giant cells and varied calcified materials.…”

“…Onishi et al. (1) in ‘Histopathological characteristics of eruption mesenchymal calcified hamartoma: two case reports’ reported two cases of delayed tooth eruption with calcified masses in the opercula, and proposed this odontogenic mass as a new variety of hamartoma, eruption mesenchymal calcified hamartoma (EMCH), which is not included in the concept of pericoronal myxofibrous hyperplasia (PMH) that we have proposed as a variety of pericoronal hamartomas (2).…”

“…(5) cited by Onishi et al. (1) is a typical example. IAF should most often be misdiagnosed as ameloblastic fibroma.…”

Quantitative histological features and ultrastructure of opercula of human teeth showing normal and delayed eruption

“…Few investigators (2, 3) described hyalinized areas surrounding the odontogenic epithelium, which were interpreted as ‘induction phenomenon’. Calcifications were described by some authors as laminated structures (4) and resembling cementum (3, 8, 10), dentin (4, 8, 10) or enamel (8). Certain other authors distinguished small, polarizing type ‘A’, and large, non‐polarizing type ‘B’, calcifications (5, 7).…”

“…Certain other authors distinguished small, polarizing type ‘A’, and large, non‐polarizing type ‘B’, calcifications (5, 7). Another prominent feature of OADTE, less frequently recognized than the above constituents, is multinucleated giant cells that are described as stellate or spindle‐shaped (8–10). Hyperplasia of the oral epithelium was observed rarely (8).…”