Rapid re-enlargement of a macroprolactinoma after initial shrinkage in a young woman treated with bromocriptine.
We report the case of a macroprolactinoma in a 32-year-old woman, who presented with secondary amenorrhea, galactorrhea, increased plasma prolactin level (3259 ng/ml), headache and bi-temporal visual field defect. Magnetic resonance imaging showed a large pituitary tumor. The patient responded well to bromocriptine (7.5 mg/day) with improvement of clinical symptoms and normalization of plasma prolactin within a few weeks. After 4 months of treatment, tumor size was also reduced markedly. During continued treatment at the same dose of bromocriptine the plasma prolactin level remained normal, but after 8 months of treatment the patient suddenly complained of worsening of her visual fields, and magnetic resonance imaging indicated re-enlargement of the tumor. Bromocriptine was discontinued and transsphenoidal pituitary surgery was performed. After surgery the visual field defect improved, but postoperative plasma prolactin level (1104 ng/ml) and magnetic resonance imaging indicated a residual tumor. Postoperative treatment with quinagolide (0.15 mg/day) resulted in disappearance of all clinical symptoms, normalization of prolactin level and a reduction in size of the residual tumor. This case demonstrates that a dissociation of the inhibitory effect of bromocriptine on tumor size and prolactin level may rarely develop during the course of drug treatment in a patient with macroprolactinoma.
Adler
Ildikó
I
Second Department of Medicine, Faculty of Medicine, Semmelweis University, 1088 Budapest, Szentkirályi str. 46, Hungary.
Barsi
Péter
P
Czirják
Sándor
S
Varga
Ibolya
I
Gergics
Péter
P
Jakab
Csilla
C
Rácz
Károly
K
D000328:Adult; D001971:Bromocriptine / Q000008:administration & dosage / Q000627:therapeutic use*; D003131:Combined Modality Therapy; D003937:Diagnosis, Differential; D005260:Female; D006727:Hormone Antagonists / Q000008:administration & dosage / Q000627:therapeutic use*; D006801:Humans; D008279:Magnetic Resonance Imaging; D009364:Neoplasm Recurrence, Local / Q000175:diagnosis* / Q000188:drug therapy / Q000473:pathology / Q000601:surgery; D010911:Pituitary Neoplasms / Q000175:diagnosis* / Q000188:drug therapy / Q000473:pathology / Q000601:surgery; D011388:Prolactin / Q000097:blood; D015175:Prolactinoma / Q000175:diagnosis* / Q000188:drug therapy / Q000473:pathology / Q000601:surgery
D006727:Hormone Antagonists; D001971:Bromocriptine; D011388:Prolactin