Fibro-osseous
lesion of the external auditory canal: a case report.
Kaohsiung J
Med Sci. 2004 Jan;20(1):31-5.
The aim of
this study was to differentiate a novel type of benign circumscribed
bone lesion of the external auditory canal from lesions described
previously, such as exostoses and osteomas. We present a 43-year-old
male patient who suffered from ear discharge of the right ear. Local
findings showed bloody discharge from his right auditory canal, which
was occupied by a mass-like tissue. Computerized tomography (CT)
carried out before resection of the lesion disclosed the absence of a
bony connection to the underlying structures. The pathologic findings
showed lesions consisting of an osteoma-like bone formation with
sparse osteoblastic areas. Mature lamellar bone and bone marrow
containing adipose tissue were also noted. There was no evidence of a
relationship to the cartilaginous tissue or bony structures of the
external auditory canal. Therefore, we present this rare case and
review the reported literature in which clinical, CT, surgical, and
pathologic findings suggest that this lesion was unlike those
previously known, and may be related to ossifying reactions in other
parts of the organism.
Fibro-osseous lesions of the
external auditory canal.Laryngoscope.
1999 Mar;109(3):488-91.
OBJECTIVES:
To differentiate a novel type of benign circumscribed bone lesion of
the external auditory canal from those described previously, such as
exostoses and osteomas. STUDY DESIGN: Information was obtained from
computed tomography (CT) images, surgical findings, and pathologic
study. METHODS: Five patients (26 to 82 years old) who presented a
hard, round, unilateral, skin-covered mass occluding the external
auditory canal to varying degrees were studied. A CT study carried out
before resection of the lesions by curettage disclosed the absence of
a bony connection to the underlying structures. All the tissue
specimens underwent pathologic study. RESULTS: CT and surgical
findings demonstrated the absence of a connective pedicle. The
pathologic findings showed lesions consisting of an osteoma-like bone
formation with sparse osteoblastic areas; mature lamellar bone was
observed in three cases, bone marrow containing adipose tissue and
hematopoietic remnants in two, and a dense, collagenous stroma in
another. They all showed irregular trabeculae, bordered by osteoid
osteoblasts. In no case was there evidence of a relationship to the
cartilaginous tissue or to the bony structures of the external
auditory canal. CONCLUSIONS: The data obtained from the clinical, CT,
surgical, and pathologic findings suggest the existence of a lesion
unlike those previously known, possibly related to ossifying reactions
in other parts of the organism.
Fibrous dysplasia of the petrous bone. HNO.2003
Dec;51(12):998-1001.
Fibrous dysplasia named after Jaffè and
Lichtenstein is a benign, self-limiting disorder of the bone
structure. The normal bone is replaced by cellular fibrous connective
tissue. Fibrous dysplasia can be differentiated into monostotic and
polyostotic forms and the McCune-Albright syndrome (combination of
polyostotic areas in the bone with hyperpigmentation of the skin and
endocrinological disturbances). The rare disease is predominantly
found in the 1st to 3rd decade of life in the femur or humerus. In
about 15% of all cases it affects the facial bones, and one-third of
these is located in the jaw bone. Extremely rare is the invasion of
the petrous bone. A 45-year-old female patient was examined because of
tinnitus persisting for 1 year. In addition, she was suffering from
increased hearing reduction and recurrent vertigo. The CT and MRT
showed a milky glass-like tumor, which was limited by an osteolytic
process situated in the left petrous bone. The process was removed via
the mastoid. Histological examination revealed fibrous dysplasia. A
highly differentiated osteosarcoma and an ossifying fibroma as
important differential diagnoses have to be excluded because of the
different therapeutic consequences.
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