Pituitary 7: 83–87, 2004
 2005 Springer Science + Business Media, Inc. Manufactured in The Netherlands.
Pituitary Apoplexy During Therapy with Cabergoline in an
Adolescent Male with Prolactin-Secreting Macroadenoma

Mirta Knoepfelmacher, Miriam C. Gomes, Maria E.
Melo, and Berenice B. Mendonca
Department of Endocrinology, Hospital das Cl´ınicas, University
of S ˜ao Paulo Medical School, S ˜ao Paulo, Brasil

Abstract. Pituitary adenomas are rare in young patients.
overcome these inconveniences. With duration of action Prolactinomas are the most common type of pituitary ade-
up to 14 days after single oral dose of 0.3 to 1.0 mg, caber- nomas in children older than 12 years, occurring more often
goline can be taken only one or twice weekly. Moreover, in girls, at a 4.5:1 female-to-male ratio. The clinical pre-
cabergoline has been demonstrated to be more effective sentation may vary according to the age and sex of the pa-
than bromocriptine in the treatment of macroprolacti- tient. Pituitary apoplexy is a rare life-threatening condition
nomas in adults [10–13] and children [14] with a low caused by a sudden infarction or hemorrhagic necrosis of the
incidence of side effects, resulting in a very good com- pituitary containing an adenoma. A wide variety of condi-
tions can trigger apoplexy such as pituitary irradiation, gen-

pliance with dosing. To our knowledge, there has been eral anesthesia, traumatic head injury, pituitary stimulatory
only one report of pituitary apoplexy with cabergoline tests and a wide variety of medications including bromocrip-
use [10]. We report the case of an adolescent male with a tine. We report a case of a 16-year-old male patient with
prolactin-secreting macroprolactinoma who presented puberty arrest harboring a macroprolactinoma, who devel-
apoplexy 12 months after cabergoline treatment.
oped a sudden clinical picture of pituitary apoplexy during
the 12th month of treatment with cabergoline.

cabergoline, puberty arrest
A 17-year-old male patient was admitted to the En-docrine Department of the Hospital das Cl´ınicas of theUniversity of S ˜ao Paulo complaining of sexual develop- ment retardation. Puberty had begun at 12, but he expe-rienced pubertal and growth arrest at 13. At 15, he was Pituitary apoplexy is a rare life-threatening condition diagnosed as having hypothyroidism, and was treated with an unknown precise incidence [1]. The classi- with levothyroxine for 6 months only. The patient re- cal apoplexy is characterized by headache, visual loss, ported having had frequent right hemicranial headache meningismus, and altered mental status [2]. This pathol- for the previous six months.
ogy is caused by tumoral hemorrhagic necrosis or pitu- Physical examination revealed a normal young male itary gland infarction [1]. Over the last 20 years, numer- weighting 60.4 Kg and measuring 164 cm (−1.7 SD) who ous case reports and small series have emphasized the presented an incomplete development of secondary sex- association of pituitary apoplexy with precipitating fac- ual characteristics. Facial and body hair were absent, tors such as radiotherapy, anticoagulation, dynamic en- pubic hair was Tanner stage III, right and left testes were docrinological testing, traumatic head injury [2,3], and a soft and measured 3.8 × 2.0 cm and penis length was wide variety of medications including bromocriptine [4– 8.3 cm. The neurological examination was unremark- 6], a drug largely used as primary treatment for prolacti- able. Ophthalmic examination showed normal visual nomas [7]. Bromocriptine, an ergot-derivative that acti- acuity and normal visual fields. T1-weighted contrast vates D1 and D2 receptors, normalizes serum PRL levels magnetic resonance imaging (MRI) showed an intra- and and induces reduction in the tumor size in patients with suprasellar mass (2.2 × 2.0 × 2.0 cm), with cystic areas, macroprolactinomas, promoting restoration of gonadal displacing the chiasma opticum and neurohypophisis to function, cessation of galactorrhea and improvement in the left (Fig. 1). Bone age was compatible with 14 years visual defects in the majority of patients [8,9]. However, according to the method of Greulich and Pyle. Basal these important clinical effects are often limited by the PRL levels were high (Table 1), suggesting the presence occurrence of side effects such as nausea, vomiting, pos- of a macroprolactinoma. The combined stimulatory pi- tural hypotension, headache and dizziness. Therefore, a tuitary test revealed, in addition to very high prolactin significant number of patients (up to 20%) does not toler-ate the drug at therapeutic doses or is resistant. Further-more, the compliance to bromocriptine is difficult dueto the short duration of action often requiring several Address correspondence to: Mirta Knoepfelmacher, R. Dr. En ´eas doses per day. Cabergoline, another dopamine-agonist C Aguiar, 255 – PAMB – 2◦ andar – Bloco 6, CEP 05403-900, S ˜ao with specificity for D2 receptor has been developed to Paulo, Brasil. E-mail:

Knoepfelmacher et al. Fig. 1. Intra- and suprasellar mass on T1 weighted MRI after
Fig. 3. Increased mass with heterogeneous enhancement,
gadolinium injection, midsagittal and coronal views, before suggesting pituitary apoplexy. tomography (CT), which showed an unmodified pitu-itary mass, and a cerebrospinal fluid analysis, whichwas normal. One week later, as the symptoms persisted,he returned to our hospital. The patient referred severeheadache, nausea and asthenia. He did not complain ofvisual abnormalities. Physical examination was normalexcept for postural hypotension. On neurological exam-ination, he was alert and fully oriented, with normal vi-sual fields and normal visual acuity; no papiledema wasevident, and the extra ocular movements were full. Theremaining cranial-nerve functions were also preserved.
Fig. 2. Tumoral shrinkage 2 months after cabergoline
Laboratory biochemical analysis showed normal lev- els of glucose, urea nitrogen, creatinine, sodium andpotassium. Pituitary MRI showed an increase in tumoral levels, multiple pituitary deficiencies: GH, LH, FSH, cor- volume, with peripheral enhancement and a central tisol and a hypothalamic pattern of TSH response, with hyposignal, suggesting an intra-adenoma hemorrhage low basal levels of free thyroxine.
(Fig. 3), which confirmed our suspicion of pituitary The patient started replacement treatment with apoplexy. He was treated with saline and high doses of levothyroxine and cortisone acetate. The initial treat- corticosteroids (dexamethasone 16 mg/day) with symp- ment with bromocriptine (BRC dosed up to 5 mg/day) tom relief within 24 hours. He was discharged on corti- was substituted by cabergoline (CAB) 2 weeks later, due sone acetate, thyroxine and cabergoline (1.5 mg/week).
to the patient's intolerance to BRC. We observed a reduc- Four months after the apoplexy, an MRI revealed a tion in tumor volume in the second month of treatment great reduction in tumor volume, with a partially empty with cabergoline (Fig. 2). There was a progressive re- sella (Fig. 4). Six months later, a new MRI showed no duction of prolactin levels and a normalization of the alterations. Prolactin levels remained low during treat- gonadotropin axis (Table 2).
ment with cabergoline (1 mg/week), testosterone levels After twelve months of cabergoline treatment, the normalized (Table 2) and the patient presented progres- patient suddenly presented headache, nausea and vom- sively normal pubertal development (Tanner IV). One iting and sought another hospital. He was discharged year after the apoplexy he was submitted to another 48 hours later, after being submitted to a computed combined pituitary stimulatory test, which revealed Table 1. Combined stimulatory pituitary test (TRH 200 µg, GnRH 100 µg and Insulin 0.1 IU/Kg)
Apoplexy 12 m after GH (µg/L)∗∗ Prolactin (µg/L) ∗Glucose nadir; ∗∗GH: µg/L = 2.6 mU/L; m = month.

Pituitary Apoplexy with Cabergoline Table 2. Evolution of hormonal levels during treatment with cabergoline
Prolactin (µg/L) ∗After 15 days with bromocriptin; ∗∗Pituitary apoplexy; d = day; m= month.
PCNA, that the predominance of large prolactinomas inmen may be related to a high frequency of rapidly grow-ing tumors, which are often invasive and bromocriptine-resistant [21].
The diagnosis of prolactinoma in our patient was based on the prolactin level, which was 1.340 µg/L. Nor-mally, such a high prolactin level suggests the presenceof a prolactinoma. Many tumors in the pituitary and inthe suprasellar region can cause an elevation in pro-lactin levels as a result of the stalk disruption, which Fig. 4. Great tumor reduction causing a partially empty sella
interrupts the normal dopamine inhibition of prolactin four months after apoplexy and on cabergoline 1 mg/week. secretion. With the stalk effect, serum prolactin levelsare usually no higher than 150 µg/L but they have beenoccasionally reported to be as high as 600 µg/L [22].
persistence of the previous diagnosed pituitary deficien- Pituitary apoplexy is a rare but life-threatening condi- cies (Table 1).
tion caused by sudden infarction or hemorrhagic necro-sis of a pituitary containing an adenoma [1]. According to Randeva et al. [2] the classical pituitary apoplexy isa clinical syndrome characterized by sudden headache, We report the case of a male adolescent with a prolactin- vomiting, visual impairment and meningismus. Subclin- secreting macroadenoma who presented apoplexy after ical apoplexy was described in 16% (22/136) of the pi- 12 months of cabergoline therapy. The onset of the pro- tuitary adenomas of patients younger than 20 years at lactinoma probably occurred around 13 yrs of age when surgery [16], but it was symptomatic in only one pa- arrest of puberty was noticed, but it was diagnosed and tient (left sixth cranial nerve palsy 5 days after com- treated only 4 years after the onset of the disease.
pleting irradiation). If the term apoplexy is reserved for Pituitary adenomas are rare in young patients, rep- instances where symptomatic hemorrhagic infarction resenting 3.5–6% of all surgically treated pediatric pitu- acutely occurs, and for those cases that result in the itary tumors [15–17]. In a large surgical series, only 6% clinical syndrome described above, the incidence of pi- (136/2,230) of the reported patients were younger than tuitary apoplexy is found to be very low, around 0.6–9.1% 20 years and most of them were at pubertal age [16]. Pro- of surgically-treated pituitary adenomas [23,24].
lactinomas are the most common type of pituitary ade- Many authors have emphasized the association of pi- noma in children older than 12 and are more frequent tuitary apoplexy with a variety of precipitating events in girls, at a 4.5:1 female to male ratio [17]. The presen- such as pituitary irradiation, general anesthesia, trau- tation of these tumors may vary, depending on the age matic head injury, dynamic testing using gonadotropin- and sex of the patient [18–20]. Prepubertal children typ- or thyrotropin-releasing hormones [1–3,25,26] and a ically present with a combination of headache, visual variety of medications including bromocriptine [4–6].
disturbance, and growth failure, whereas pubertal fe- However, in many cases the association of these events males frequently present with puberty arrest and hypog- and apoplexy does not imply necessarily in causa- onadism, with or without galactorrhea. Pubertal males tion. A causal relationship between bromocriptine and may present with headaches and visual impairment, as apoplexy has been suggested because adenomas have well as pubertal arrest or growth failure. Gynecomastia sometimes shown necrosis at surgery after bromocrip- is not a common sign. Males are more likely than females tine treatment [23]. Although various factors have been to present a macroadenoma [18–21] and most authors proposed to be predisposing events leading to pituitary explain this feature based on the fact that males, more apoplexy, most cases are not associated with any pre- often than females, postpone seeking medical attention disposing factor [2,3,27]. However, Randeva et al. [2] because their clinical presentation is less conspicuous.
noted arterial hypertension (conservatively defined as It has been suggested, however, based upon analysis of SBP > 160 mmHG or DBP > 90 mmHg) to be the most the cell proliferation-related nuclear antigens Ki-67 and common predisposing condition, present in one-fourth Knoepfelmacher et al. of their series before the apopletic event. In another adolescent with pubertal arrest harboring a macropro- retrospective study, potential precipitating factors were identified in only nine (30%) of 30 consecutive patientswith pituitary apoplexy [3]. In this series there was no sex preponderance and no population that seemed tohave more predisposition for pituitary apoplexy, which 1. Rolih CA, Ober KP. Pituitary apoplexy. Endocrinology and occurred along a broad age range, from the 1st to the Metabolism Clin N Am 1993;22:291–302.
9th decade, and in tumors of almost any size. The au- 2. Randeva HS, Schoebel J, Byrne J, Esiri M, Adams CBT, Wass thors concluded that pituitary apoplexy is unpredictable JAH. Classical pituitary apoplexy: Clinical features, manage- and should be considered in any patient with abrupt ment and outcome. Clin Endocrinol 1999;51:181–188.
neuro-ophthalmologic deterioration associated with se- 3. Biousse V, Newman NJ, Oyesiku NM. Precipitating factors in vere headache.
pituitary apoplexy. J Neurol Neuros and Psych 2001;71:542– Similarly to our case, pituitary apoplexy was reported 4. Yamaji J, Ishibashi M, Kosaka K, Hori T, Manaka S. Pituitary late in the course of bromocriptine treatment, in a girl apoplexy in acromegaly during bromocriptine therapy. Acta of 14 years with a history of arrested puberty asso- ciated to a macroprolactinoma [17]. After 6 months 5. Shirataki K, Chihara K, Shibata Y, Tamaki N, Matsumoto S, of bromocriptine treatment, she suddenly developed Fujita T. Pituitary apoplexy manifested during a bromocriptine headaches without impaired vision, followed 2 days test in a patient with growth hormone and prolactin producing later by vomiting and fever. Pituitary apoplexy during pituitary adenoma. Neurosurgery 1988;23:395–398.
cabergoline treatment has been reported previously in 6. Pinto G, Zerah M, Trivin C, Brauner R. Pituitary apoplexy in an a 26-year-old female patient harboring a macroprolacti- adolescent with prolactin-secreting adenoma. Hormone Re- noma [10]. She complained of severe headaches associ- ated with an increase in tumor size at 12 weeks, need- 7. Vance ML, Evans W, Thorner M. Bromocriptine Ann Intern ing transsphenoidal surgery. In our case, the patient 8. Liuzzi A, Dallabonzana D, Oppizzi G, Verde GG, Cozzi R, presented decrease of tumoral volume 2 months after Chiodini P, Luccarelli G. Low dose of dopamine agonists in starting treatment with cabergoline, which is in accor- the long-term treatment of macroprolactinomas. N Engl J Med dance with the literature [10,28]. This therapy led to normalization of prolactin levels and tumor size reduc- 9. Molitch ME, Elton RL, Blackwell RE, Caldwell B, Chang RJ, tion with a low dose of the drug and in a short time, Jaffe R, Joplin G, Robbins RJ, Tyson J, Thorner MO. Bromocrip- demonstrating that this prolactinoma was quite respon- tine as primary therapy for prolactin-secreting macroprolacti- sive to this dopaminergic agonist. Colao et al. [14] re- nomas: Result of a prospective multicenter study. J Clin En- ported a normalization of prolactin in only 10 of 26 docrinol Metab 1985;60:698–705.
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