system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 17-year-old girl presents with significant weight loss over the last few months. There is a positive family history of Hodgkin lymphoma and hyperthyroidism. Her blood pressure is 100/65 mm Hg, pulse rate is 60/min, and respiratory rate is 17/min. Her weight is 41 kg and height is 165 cm. On physical examination, the patient is ill-appearing. Her skin is dry, and there are several patches of thin hair on her arm. No parotid gland enlargement is noted and her knuckles show no signs of trauma. Laboratory findings are significant for the following:
Hemoglobin  10.1 g/dL
Hematocrit 37.7%
Leukocyte count  5,500/mm³
Neutrophils 65% 
Lymphocytes  30%
Monocytes 5%
Mean corpuscular volume  65.2 µm³
Platelet count 190,000/mm³
Erythrocyte sedimentation rate  10 mm/h
Which of the following findings is associated with this patient’s most likely condition?
assistant
Amenorrhea