case_images: PMC11789519_01
case_images: Different imaging examinations showing a stone and entity voided with urine. (A) Abdomen non-contrast helical CT shows a circular stone. (B) Ultrasonography of the abdomen shows an isoechoic mass with calcification in the bladder. (C) A circular stone with black hair (outer ring diameter about 4 cm).
case_images: RRU-17-11-g0001.jpg
case_images: PMC11789519_01_RRU-17-11-g0001.jpg
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case_images: She was diagnosed with a bladder stone after receiving abdominal computed tomography (CT) scan (Figure 1A) and ultrasound examination (Figure 1B). After that, she intermittently found some circular stones with hair (Figure 1C) in her urine; meanwhile, urinary interruption still occurred occasionally. 
case_images: Neoplasia with stone on its surface and hair also attached so that it resembles a "needle mushroom" or "crab leg" (A and B). The complete neoplasia (C) and a yellow fat cross-section after incision (D).
case_images: RRU-17-11-g0002.jpg
case_images: PMC11789519_01_RRU-17-11-g0002.jpg
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case_images: Cystoscopy showed a 2cmx4 cm white, pedunculated neoplasia with hair on the top wall of the bladder as well as a general urinary stone; the neoplasia had a stone on its surface with hair attached; it resembled a needle mushroom or crab leg (Figure 2A and B). The specimen appearsed intact from its outward appearance (Figure 2C and D) and a postoperative CT scan demonstrated the same finding.
case_images: Histopathological slide shows high (20x20 for focal part) and low (10x10 for whole slice) magnification views. (A) Red arrow: hair follicle, yellow arrow: sebaceous gland, blue arrow: fibrous tissue. (B) Yellow arrow: glandular tissue, red arrow: adipose tissue. (C) Red arrow: nervous tissue, blue arrow: ganglion cells.
case_images: RRU-17-11-g0003.jpg
case_images: PMC11789519_01_RRU-17-11-g0003.jpg
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case_images: A histological examination confirmed it to be a mature teratoma, confined to the bladder wall (Figure 3).  