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Biopsies and excision
specimens from the pinna and the superficial external auditory canal
are the most common aural specimens received in most diagnostic
laboratories.
Visit:
Aural Biopsy: Clinical details required for the
diagnosis
;
Histopathological diagnosis of Aural Biopsy - Middle Ear
;
Histopathological examination of Aural Biopsy- Inner Ear.
Specimens from the pinna :
These
are usually taken for the diagnosis of specific diseases such as
Chondrodermatitis Nodularis Helicis
, and for the diagnosis and treatment of neoplasms.
It is
unlikely that the pinna will have been excised for neoplasia without a
previous small biopsy.
Because of sampling problems in these biopsies, the tumour found on
the excision specimens may have a different appearance from that
diagnosed on biopsy.
A
diagnosis of
Basal cell carcinoma
with small areas of squamous differentiation may be changed to poorly
differentiated
Squamous Cell Carcinoma
on the excision
specimen.
Histopathology report :
For
inflammatory conditions the report should comment on:
1. Types of inflammation:
-acute, chronic, nonspecific, granulomatous;
- severity;
- tissues involved, such as cartilage;
2.
Presence of :
-
necrosis, such as
of cartilage
- vasculitis
-
ulceration and its depth.
For neoplasms the
report should comment on:
-type and
differentiation :
-whether
there is epithelial dysplasia adjacent to the neoplasm :
-Involvement of : (i) Cartilage ; (ii) External auditory canal
-proximity
of tumour to excision margins.
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