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Presented by Ralph Hruban, M.D. and prepared by Robert E LeBlanc, M.D.
Case 1: This 60 year old with a remote history of a cholecystectomy developed a firm nodule in his rectus abdominus muscle.
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Question 1 of 1
1. Question
Week 530: Case 1
This 60 year old with a remote history of a cholecystectomy developed a firm nodule in his rectus abdominus muscle. A CT scan revealed that the mass was calcified. The lesion was resected.images/RHH1 01.jpg
images/RHH1 02.jpg
images/RHH1 03.jpgCorrect
Answer: Ectopic glands with reactive bone formation
Histology: This well-demarcated nodule is composed of mature bone and soft tissue with rare admixed glands. The glands are lined by uniform cells without nuclear atypia.
Discussion: Although the glands are in an abnormal location, they lack atypia. A review of the patient’s history revealed a remote history of a complicated cholecystectomy in which there was reported to be disruption of the gallbladder. Non-neoplastic epithelial cells must have shed from the gallbladder and implanted in the rectus abdominus muscle.
Incorrect
Answer: Ectopic glands with reactive bone formation
Histology: This well-demarcated nodule is composed of mature bone and soft tissue with rare admixed glands. The glands are lined by uniform cells without nuclear atypia.
Discussion: Although the glands are in an abnormal location, they lack atypia. A review of the patient’s history revealed a remote history of a complicated cholecystectomy in which there was reported to be disruption of the gallbladder. Non-neoplastic epithelial cells must have shed from the gallbladder and implanted in the rectus abdominus muscle.
