{
  "abstract": "A female infant presented with a perianal mass. Her mother had noticed the mass while changing her daughter’s diaper the day before presentation. The patient’s developmental milestones were appropriate for her age. She had mild constipation, occasionally passing hard and large stools. There was no diarrhoea or bloody stool. She was born at our hospital without any perinatal abnormalities, and no perianal mass was noted during examinations after birth. On physical examination, a smooth, fresh pink, pyramidal-shaped mass was observed anterior to the anus ( figure 1), consistent with infantile perianal pyramidal protrusion (IPPP). Given the benign nature of the lesion, we opted for observation and scheduled a follow-up 2 weeks later, at which time the mass had regressed (figure 2). Although there were several episodes of re-enlargement over the following year, the lesion spontaneously regressed within several days each time.",
  "authors": [
    {
      "affiliations": [
        "Division of Pediatric Emergency Medicine, Tokyo Metropolitan Children’s Medical Center, Fuchu, Tokyo, Japan"
      ],
      "name": "Kazuki Iio"
    },
    {
      "affiliations": [
        "Department of Surgery, Tokyo Metropolitan Children’s Medical Center, Fuchu, Tokyo, Japan"
      ],
      "name": "Ayano Tsukizaki"
    }
  ],
  "title": "Infantile perianal pyramidal protrusion: a benign perianal tumour in infancy",
  "uid": "62abd6cf-57d7-5c3b-97e1-bd80ceb9ae62"
}