RESUMOObjetivo: Relatar um caso de macroprolactinoma diagnosticado em adolescente e tratado com cabergolina.Descrição do caso: Paciente do sexo feminino, 15 anos, iniciou quadro clínico aos dez anos, com cefaleia, obesidade e não havia apresentado menarca ao diagnóstico. A dosagem sérica inicial de prolactina foi de 2492ng/mL (valor de referência: 19-25ng/mL). A ressonância nuclear magnética de crânio evidenciou formação expansiva selar e suprasselar compatível com macroadenoma hipofisário sem compressão do quiasma óptico. Seis meses após o início do tratamento com cabergolina, houve queda significativa dos níveis séri-cos de prolactina para 87,7ng/mL, com redução de 76% no tamanho da lesão e melhora sintomática.Comentários: A ocorrência dos prolactinomas é rara na infância e na adolescência, mas o seu comportamento pode ser mais agressivo. O diagnóstico precoce e o manejo adequado do caso são importantes para um bom prognóstico.Palavras-chave: prolactinoma; adolescente; cefaléia/ etiologia; amenorréia/etiologia. ABSTRACT Objective:To report a teenager with macroprolactinoma treated with cabergoline.Case description: A 15-year old female adolescent reported the onset of headaches and obesity since ten years old.At diagnosis amenorrhea was not present. The serum level of prolactin was initially 2492ng/mL (reference values: 19-25ng/mL). Magnetic resonance images of the skull revealed an expansive sellar and suprasellar pituitary macroadenoma without optical chiasmal compression. Six months after starting treatment with cabergoline, there was a significant decrease of prolactin levels to 87.7 ng/mL, with a 76% reduction in the lesion size and she reported improvement of the symptoms.Comments: In childhood and adolescence, prolactinomas are rare, but when they occur the clinical course is more aggressive. Early diagnosis and proper management of the disease are important for a good prognosis.
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