trichobezoar is a bezoar (a mass found trapped in the gastrointestinal system) formed from the ingestion of hair.   Trichobezoars are often associated with trichotillomania (compulsive hair pulling), are rare,and can be fatal if undetected.   Surgical intervention is often required.

A massive trichobezoar visible on this CT scan scout film, in a 13 year old girl who presented with a 2 week history of intractable abdominal pain, and a 12 lb weight loss.

Reference: Learning radiology
(***note, the surgical image below is a different case than the CT scan above.)
Link to additional case in Pediatric Consultant
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