Abstract
Pneumosinus dilatans is a rare condition of abnormal dilatation of the paranasal sinuses. It can involve one or all of the sinuses. It may be developmental or associated with other conditions, mainly potentially obstructive lesions of the sinus cavity. Fibrous dysplasia is a benign condition in which the normal bone matrix is replaced by a disorganized fibrous tissue that involves craniofacial bones or peripheral skeleton. The entity may be a part of McCune-Albright syndrome or Mazabraud syndrome. Complications include extra skeletal manifestations like hyper functioning endocrinopathies and malignant transformation. Here we report a case of long-standing fibrous dysplasia leading to a frontal swelling due to complex dilatation of left frontal sinus- pneumosinus dilatans.
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