A rare case of bilateral axillary accessory breast tissue coexisting with prolactinoma in an adolescent girl.
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BACKGROUND: Unlike polythelia, which is typically identified at birth by the presence of an areola or nipple, accessory axillary breast tissue is rarely observed in children and adolescents. Nevertheless, it can affect this age group and should be considered in the differential diagnosis of an axillary mass. CASE PRESENTATION: A 15-year-old girl with a diagnosed prolactinoma, receiving cabergoline treatment, presented with a week's history of tender, bilateral axillary masses. Ultrasonographic evaluation and subsequent surgical excision confirmed the diagnosis of bilateral accessory axillary breast tissue. To the best of our knowledge, this is the first reported case of co-existing bilateral accessory axillary breast tissue and prolactinoma in an adolescent girl. CONCLUSION: This case highlights the importance of thorough physical examination in adolescents with prolactinomas. Accessory breast tissue may become more prominent during puberty or in hyperprolactinemic states, and it may be misdiagnosed. Recognizing this rare occurrence is key to avoiding unnecessary investigations or interventions.