Eagle syndrome refers to symptomatic elongation of the styloid process or calcified stylohyoid ligament 1-2. It is often bilateral. In most cases, the cause is unknown; however, the condition is sometimes associated with disorders causing heterotopic calcification such as abnormal calcium/phosphorus metabolism and chronic renal failure.

Eagle syndrome (also termed stylohyoid syndrome styloid syndrome, styloid-stylohyoid syndrome, or styloid–carotid artery syndrome) is a rare condition characterized by sudden, sharp nerve-like pain in the jaw bone and joint, back of the throat, and base of the tongue, triggered by swallowing, moving the jaw, or turning .

Eagle syndrome can occur unilaterally or bilaterally and most frequently results in symptoms of dysphagia, headache, pain on rotation of the neck, pain on extension of the tongue, change in voice, and a sensation of hypersalivation We present rare and diagnostic radiographic evidence of this on both plain film radiographs and CT scans. Although well documented in otolaryngology literature and dentistry literature, this syndrome has not been reported in the radiology literature.

Credits: Vijayakumar Sadhanandham Sir

The comb sign refers to the hypervascular appearance of the mesentery in active Crohn disease.  Fibrofatty proliferation and perivascular inflammatory infiltration outline the distended intestinal arcades. This forms linear densities on the mesenteric side of the affected segments of small bowel, which give the appearance of the teeth of a comb. 

The sign may be seen on both CT and MRI.  It is not pathognomic of Crohn disease; however in a known case of Crohn disease would suggest that the disease was extensive advanced and active, however comb sign can be seen in other acute inflammatory conditions of bowel and lupus mesentric vasculitis. 

The comb sign may be used to differentiate active inflammatory condition from lymphoma and metastases, which tend to be hypovascular.

Credits: Vijayakumar Sadhanandham Sir