
Checa A, Gecchelin R, Pereyra M, Ramacciotti C, Bertolino ML, Pautasso M, Sáenz F, Cohen E. Hipertiroidismo
secundario a adenoma hipofisario productor de tsh. reporte de un caso.
Figura 2: Inmunohistoquímica positiva para TSH en
citoplasma.
Conclusión
El tirotropinoma es un tumor hipofisario de baja
frecuencia. La prueba de TRH es de utilidad en el
diagnóstico diferencial de tirotropinoma y
resistencia a hormonas tiroideas4. Presentamos
este caso debido a la baja prevalencia de este tipo
de neoplasias y su buena respuesta al tratamiento
indicado.
Introduction
Thyrotropinoma is a TSH-secreting tumor, 1% of
pituitary adenomas. It is a rare cause of
hyperthyroidism. It presents with thyrotoxicosis or
pituitary mass symptoms. 30% cosecrete other
hormones1. Thyroid function tests reveal a not
suppressed Ts H with high free T4 and T3. TRH
stimulation test is the gold standard, completed
with a pituitary MRI2. The first line treatment is
surgical3.
Clinical case
Male of 31 years who consulted for recent
universal alopecia. He referred palpitations,
anxiety, insomnia and heat intolerance. Physical
examination revealed fine tremor, tachycardia and
goiter. Thyroid function tests revealed: TSH 4.09
(0.27-4.20uUI/ml), free T4 2.51 (0.93-1.71ng/dl)
and T3 240 (84-202ng/dl) with negative
antiperoxidase and antithyroglobuline antibodies.
Normal androgen axis. Thyroid ultrasound:
enlarged gland. TRH stimulation test: TSH after 30
minutes 4.24uUI/ml (low response), suggesting
secondary hiperthyroidism. Pituitary MRI:
Hypointense image on T1 12mmx14.6mmx6mm
compatible with pituitary adenoma. Rest of the
pituitary profile was normal. Treatment with
Propanolol 40 mg/day was indicated and surgery
was performed (transeptosphenoidal exeresis of
pituitary adenoma), with well postoperative
evolution. Peripheral thyroid hormones decreased
until reaching a T3 value of 115ng/dl, and free T4
of 1.11ng/dl a month after patient underwent
surgery. Pathological anatomy: TSH producing
adenoma (thyrotropinoma). The patient referred
hair regrowth and evolved asymptomatic.
Conclusion
Thyrotropinoma is a low frequency pituitary
tumor. The TRH stimulation test is useful in the
differential diagnosis of thyrotropinoma and
resistance to thyroid hormones 4. We present this
case due to the low prevalence of this type of
neoplasms and its well response to initial
treatment.
Bibliografía
1. Yazgan D. et al. Thyrotropinoma and
multinodular goiter: A diagnostic challenge
for hyperthyroidism. J Res Med Sci. 2013
Nov; 18(11): 1008-1010.
2. Casamitjana r. Actualización de pruebas
funcionales en endocrinología. Endocrinol
Nutr 2003; 50(6):250-6
3. Pignatta A. et al. TSH Secreting Pituitary
Adenoma (Thyrotropinoma): Five Case
Reports. Rev Argent Endocrinol Metab
2014; 51:141-150.
4. Singh B. et al. A clinician’s guide to
understanding resistance to thyroid hormone
due to receptor mutations in the TRa and
TRp isoforms. Singh and Yen Clinical
Diabetes and Endocrinology 2017; 3:8
Palabras claves
TIROTROPINOMA, HIPERTIROIDISMO
CENTRAL
Keywords
THYROTROPINOMA, CENTRAL
HYPERTHYROIDISM.
Revista Methodo: Investigación Aplicada a las Ciencias Biológicas. Universidad Católica de Córdoba.
Jacinto Ríos 571 B° Gral. Paz. X5004FXS. Córdoba. Argentina. Tel.: (54) 351 4517299 / Correo:
methodo@ucc.edu.ar / Web: methodo.ucc.edu.ar | CASO CLINICO Methodo 2019 ;4 (1):25-26
26