is a blood-filled cavity between the cartilage and the supporting perichondrium (1)
it is a condition with similarities to the subchondral haematoma seen in ear injuries - and in fact may have similar clinical consequences.
it occurs when there has been a shearing injury causing the perichondrium to be stripped from the underlying cartilage. Unless corrected, necrosis results as the cartilage is dependent upon the perichondrium for its blood supply, by diffusion.
treatment
urgent drainage and firm nasal packing to ensure adherence of the perichondrium to the cartilage.
it should be aspirated immediately or can be incised with the aid of local anesthesia (1)
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