Table 1.

Cases: diagnostic features

	Case number
	1	2	3	4
Sex	Female	Female	Female	Female
Age	9	14	15	7
Chronic abdominal pain	No	Yes	Yes	No
Vomiting	Yes	Yes	No	No
Weight loss	Yes	No	Yes	No
Alopecia	No	No	No	Yes
Mass palpable	Yes	No	Yes	Yes
Signs of peritonitis	No	Yes	No	No
Psychiatric comorbidity	Mental disturbance	None	Trichophagia	Trichophagia
Laboratory results		Elevated blood and urine amylase		Anemia
Plain abdominal X-ray results	Shadow abdomen	Air-fluid levels
Ultrasound results		Free fluid		Intraluminal mass
Barium contrast study results	Intraluminal mass			Intraluminal mass
MRI results				Intraluminal mass
Endoscopic results	Trichobezoar		Trichobezoar
Diagnosis made before surgery	Yes	No	Yes	Yes