Foco pulmonar facticio con 18F-FDG: posible error en la interpretación de la PET-CT / Lung hot spot as pitfall in PET-CT interpretation: focal lung uptake of 18F-fluorodeoxyglucose

Aportamos dos casos de pacientes oncológicos en seguimiento rutinario con este tipo de artefacto, sin correlato morfológico en la TAC. Se procedió a la repetición del estudio en uno de ellos, lo que permitió comprobar una normalización de dicha hipercaptación, orientando a un posible artefacto. La PET-TAC con FDG se ha convertido en una herramienta imprescindible en el manejo del paciente oncológico. La distribución normal de la FDG y los posibles artefactos (pitfalls), incluidos aquéllos derivados de la corrección de atenuación basada en la TAC, han sido descritos en diversas revisiones. Sin embargo, sólo recientemente se ha publicado algún caso de falso positivo en forma de captación focal pulmonar de FDG(AU)

18F-FDG PET-CT has become an essential tool in oncology patient management. The normal distribution of the FDG and the possible artifacts (pitfalls), including those from CT-based attenuation correction, have already been described in several reviews. However, only a few cases of FDG focal lung uptake have been reported recently. We present two cases of oncology patients during a routine follow-up with this type of pitfall, without morphological correlation in the CT scan. We repeated the study in one of them, which made it possible to verify normalization of the hyperuptake, orienting us towards a possible pitfall(AU)

[Lung hot spot as pitfall in PET-CT interpretation: focal lung uptake of 18F-fluorodeoxyglucose]. / Foco pulmonar facticio con (18)F-FDG: posible error en la interpretación de la PET-CT.

(18)F-FDG PET-CT has become an essential tool in oncology patient management. The normal distribution of the FDG and the possible artifacts (pitfalls), including those from CT-based attenuation correction, have already been described in several reviews. However, only a few cases of FDG focal lung uptake have been reported recently. We present two cases of oncology patients during a routine follow-up with this type of pitfall, without morphological correlation in the CT scan. We repeated the study in one of them, which made it possible to verify normalization of the hyperuptake, orienting us towards a possible pitfall.

Cytoreductive surgery and perioperative intraperitoneal chemotherapy in patients with peritoneal carcinomatosis of colonic origin: outcomes after 7 years' experience of a new centre for peritoneal surface malignancies

INTRODUCTION: Peritoneal carcinomatosis is a relatively frequent situation in the natural history of colorectal cancer and is associated with a dismal prognosis. Promising results have been shown after radical cytoreduction followed by intraperitoneal chemohyperthermic perfusion. The aim our study was to assess the outcomes after treating patients with peritoneal carcinomatosis of colonic origin by means of cytoreductive surgery and intraoperative hyperthermic intraperitoneal chemotherapy (HIPEC) followed by early postoperative intraperitoneal chemotherapy (EPIC). METHODS: Tumour resection was performed in accordance with the guidelines for oncologic surgery. Selective peritonectomies and remnant nodule electroevaporation were performed with the aim of achieving a complete cytoreduction. Peritoneal perfusion was carried out according to the Coliseum technique at 0.5-1 L/min, and chemotherapy was administered at 42oC for 40-90 min. Mitomycin C 10-12.5 mg/m(2) or oxaliplatin 360 mg/m(2) was used. Postoperative intraperitoneally administered 5-fluorouracil (5-FU) (650 mg/m(2) per day) was given for 5 consecutive days. RESULTS: Twenty patients were treated from 2001 to 2008. The mean peritoneal cancer index was 11 (range 2-39). Fifteen patients had undergone complete cytoreductive surgery. The morbidity was 40%. There was one case of death due to bone marrow aplasia. Ten patients had recurrence; five of them underwent salvage surgery. Two patients were treated with a second HIPEC. Actuarial overall survival and progression-free survival were 36% and 30% at 5 years, respectively, with a median follow-up of 18 (range 8-28) months. CONCLUSIONS: Cytoreductive surgery combined with HIPEC is a feasible technique that might increase patient survival. It represents a potential cure for selected patients who have no other alternatives (AU)

Solitary focus in the liver in a thyroid cancer patient after a whole body scan with 131 iodine.

A 51-year-old woman diagnosed with follicular variant of papillary thyroid carcinoma underwent a total thyroidectomy followed four weeks later by an ablative dose of 3.7 GBq of 131I. A whole body scan 5 days after ablation showed an intense uptake within the thyroid bed and a focal uptake located in the right lung base or liver dome. Computed tomography examination revealed a hypodense hepatic node in segment VII resembling a liver metastasis. Histological examination after ultrasound-guided fine-needle aspiration characterized the lesion as a liver abscess. The abscess regressed after antibiotic therapy. Liver metastases from papillary thyroid carcinoma are uncommon. On the other hand, false positive findings of 131I whole body scans have been described. A focal hepatic uptake might represent a metastasis (rare in papillary carcinomas) or be related to other causes (cysts, inflammation or infection, non-thyroidal neoplasms, etc.).

Solitary focus in the liver in a thyroid cancer patient after a whole body scan with 131 iodine

A 51-year-old woman diagnosed with follicular variant of papillary thyroid carcinoma underwent a total thyroidectomy followed four weeks later by an ablative dose of 3.7 GBq of 131I. A whole body scan 5 days after ablation showed an intense uptake within the thyroid bed and a focal uptake located in the right lung base or liver dome. Computed tomography examination revealed a hypodense hepatic node in segment VII resembling a liver metastasis. Histological examination after ultrasound-guided fine-needle aspiration characterized the lesion as a liver abscess. The abscess regressed after antibiotic therapy. Liver metastases from papillary thyroid carcinoma are uncommon. On the other hand, false positive findings of 131I whole body scans have been described. A focal hepatic uptake might represent a metastasis (rare in papillary carcinomas) or be related to other causes (cysts, inflammation or infection, non-thyroidal neoplasms, etc.)

Se presenta el caso de una mujer de 51 añosdiagnosticada de carcinoma papilar de tiroides, variante folicular, sometida a tiroidectomía total seguida 4 semanas después por una dosis ablativa de 3,7 GBq de 131I. El rastreo corporal total a los 5 días mostró una intensa captación en el lecho tiroideo, y una captación focal localizada en la base del pulmón derecho o la cúpula hepática. La tomografía axial computarizadasubsecuente reveló un nódulo hipodenso en el segmentoVII hepático, sugestivo de metástasis. El estudio patológico del material obtenido mediante punción-aspiración con aguja fina (PAAF) lo caracterizó como absceso hepático. Tras tratamiento antibiótico se objetivó regresión del mismo. Las metástasishepáticas de carcinoma papilar de tiroides son infrecuentes y, por otro lado, se han descrito con anterioridad falsos positivos del rastreo con 131I. Una captación focal hepática podría representar una metástasis (rara en carcinomas papilares) o estar relacionada con otras causas (quistes, inflamación o infección, tumores no tiroideos, etc.) (AU)

Controversial origin of Pseudomyxoma peritonei

Pseudomyxoma peritonei describes the accumulation of mucinous material in the abdominal cavity. The main diagnostic problem appears when the primary site of origin could be appendix or ovary. In this paper describe clinicopathological features and biological markers that support appendiceal origin (AU)