Anteater nose sign

 

The anteater nose sign refers to an anterior tubular prolongation of the superior calcaneus which approaches or overlaps the navicular on a lateral radiograph of the foot. This fancifully resembles the nose of an anteater and is an indication of calcaneonavicular coalition 

the appearance on a lateral view of the foot of an abnormal bony fusion of the calcaneus and navicular bones accompanied by a bony bar (tarsal coalition) extending between the two bones, with an elongated tubule-like extension of the anterior and superior process of calcaneus, fancifully likened to an anteater’s elongated nose.

Credits : Vijayakumar Sir

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Balloon on a string sign (ureter)

 

The balloon on a string sign refers to the appearance of the ureter on intravenous urography in ureteropelvic junction obstruction. It is seen due to the high and eccentric point of the exit of ureter from a dilated renal pelvis. 

Angiographic string sign 

Carotid stenting under proximal cerebral protection seems to be a feasible and safe procedure to manage patients with severe carotid stenosis in presence of angiographic string sign. Further prospective trials are required to prove efficacy of CAS in larger study populations.

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Ball of wool / Yarn sign (hydatid cyst)

The ball of wool sign, also referred to as the yarn sign or congealed water lily sign, is an ultrasound appearance, representing degeneration of hydatid cysts . The inner side of the cyst detaches from the cyst wall and folds on itself, causing a change from anechoic (fluid) to a solid, hyperechoic appearance without internal septations or daughte Renal hydatid infection

Renal hydatid infection is extremely rare and is seen in less than 5% of patients with hydatid disease1. Infection is caused by a parasitic zoonosis with the Echinococcus tape worm.  The kidneys are the most commonly affected urinary organs, but bladder, prostate, seminal vesicles and testis can also be involved

 

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Baastrup's disease (kissing spine syndrome)

 

Baastrup's sign or kissing spine, is an orthopedic and radiographic disorder that often occurs in elderly humans. It is characterized by enlargement of the posterior spinous projections of the lumbar spine, with normal intervertebral disc height and neuroforamina.

Baastrup's sign, or kissing spine, is an orthopedic and radiographic disorder that often occurs in elderly humans. It is characterized by enlargement of the posterior spinous projections of the lumbar spine, with normal intervertebral disc height and neuroforamina. The reason it is referred to as kissing spine is because the posterior spinous processes 'kiss' and touch one another as the individual goes into lumbar extension, for example when flat on their stomach. The condition has been seen in humans, canines, particularly with boxer breeds, and certain breeds of horses. This disorder is named after Christian Ingerslev Baastrup.

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Anteater nose sign

 

The anteater nose sign refers to an anterior tubular prolongation of the superior calcaneus which approaches or overlaps the navicular on a lateral radiograph of the foot. This fancifully resembles the nose of an anteater and is an indication of calcaneonavicular coalition 

the appearance on a lateral view of the foot of an abnormal bony fusion of the calcaneus and navicular bones accompanied by a bony bar (tarsal coalition) extending between the two bones, with an elongated tubule-like extension of the anterior and superior process of calcaneus, fancifully likened to an anteater’s elongated nose.

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Download - Basic Radiology Physics by K.Thayalan

 

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Air Crescent Sign

 

An air crescent sign describes the crescent of air that can be seen in invasive aspergillosis, semi-invasive aspergillosis or other processes that cause pulmonary necrosis. It usually heralds recovery and is the result of increased granulocyte activity.

In angioinvasive fungal infection, the nodules are composed of infected haemorrhagic and infarcted lung tissue. As the neutrophil count recovers and the patient mounts an immune response, peripheral reabsorption of necrotic tissue causes the retraction of the infarcted centre and air fills the space in between. This creates an air crescent within the nodules and is a good prognostic finding because it marks the recovery phase of the infection. This sign is seen in approximately 50% of patients.

It should not to be confused with the Monod sign 2 which describes the air that surrounds an aspergilloma. Unfortunately, the air around the fungal ball is also crescent shaped and the term air crescent sign is often used interchangeably in that instance. Opinion as to the validity of this latter use is controversial, but probably not worth losing too much sleep over.

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